Hi, theres is a chance to get the service manual for Sansui AU-X901 ? thanks

4 boxes for open baffle subwoofer. Cut for the Seas L26RO4Y driver (for adding subs to LxMini).

Two painted, two unpainted.

$30 for one, or $100 for all four.

Pickup in Sacramento (or in SF/on the way but that will be in a few weeks

Thanks

S

WTB 1steropair F3 pcb.

Hi

I have a 4x10 HD in good condition with original boxes and power cable, no remote. Available for local pickup in San Francisco, or Sacramento or anywhere in between.

$300 + Shipping.

Thanks

Shri

I used to use a Creative Sound Blaster X3 connected to a set of Logitech z607 5.1 speakers for my PC, which I converted into an all-in-one entertainment system in my lounge room including using it for TV and a home theater, and the bass redirection passed sound 80hz and lower from all 5 satellite speakers to my sub. I went to my onboard Realtek on my B550 MoBo because it has loudness equalization for gaming which my Sound Blaster X3 does not. The problem is its bass management only works for the front left and front right speakers and not for my center, rear left, and rear right. I hooked up my SB X3 again only to find a Windows update that happened in the meantime has broken bass redirection completely. Is there a program free or paid (as long as it's not a monthly or yearly subscription) that would allow me to have bass redirection from all 5 speakers globally with LFE gain included, so I can disable it in my Gigabyte Realtek audio panel and use said program? An example of my conundrum is the DOS game Exhumed, running through the Raze source port, that supports surround sound. When I open a door in front of me I hear the bass as the sound of grinding stone is heard in front of me, but when the door closes behind me the sound is flat and quiet, even when I set the front speakers to -10dB and the rear speakers to +10dB. My sub is set to +5dB.

To start, if you're aware of other threads/links on this subject please feel free to reference.

Backstory: Since joining this forum years ago and learning hornresp, I've played around with hundreds of combinations of subwoofer designs and speakers in hornresp and it has become one of my favorite ways to burn time. It's not uncommon for me to see a driver, lookup the T/S parameters, plug into hornresp and see if I can make a box with the flattest response curve between 40-100hz.

Example: Eminence Legend BP 102 in a ported box vs TH smoothed with a 2mh inductor in series



When I swap out the Eminence Legend driver with a JBL GT5-10D, everything goes crazy:



There doesn't seem to be much I can do with the TH dimensions in the GT5-10D to flatten it out. Therefore it seems this driver just isn't suitable for a TH unless I'm really doing something wrong here (I do want to know).

If this is not a mistake on my part, I'd really like to understand why this is happening.

I'd also like to hear any opinions on using the Legend BP 102 in a TH. These dimensions seem very reasonable and easy to build, especially if I build a TH with only one turn. I'm not concerned with maximum power (I see it will reach xmax with ~50 watts), just something with good response that is not too big and easy to build.

Settings for the Legend BP 102TH:


Bass reflex:



Settings for JBL GT5-10D TH:


Bass reflex:

Hi,

I found an old "Digitech AA0505" 75WRMS stereo amp in the garage.
I was gifted this years ago and recall it always suffered from distortion.

I'd like to have a go at repairing this but I have not been able to find a circuit diagram on the 'net.

Any assistance or hints where to start would be gratefully received.

Cheers
DMonds

Why the modern audio amplifiers, dont have Bass, Treble, balance
What is the alternative they are using?
Just like Onkyo M-5010

Equalizers are also vanished.

As I know, the main difference consist on the enclosure resp. cabinet version. But maybe there are additional differences on the electrical parts.
Because on the web I have found only information concerning the "LE" version I also think it is possible that this model "750" was only manufactured and thus only available as an "LE" version.
Thank you for clarify.
P.S.: A friend of me want to replace the drivers for bass-Midrange and dome tweeter because the voice coils don't longer work in the right manner.
Which currently available drivers are close to those from genuine used ?
Thank you for an advice.

Here a review from the "LE" version
https://www.tnt-audio.com/casse/miss750e.html

As per the title. Bought for a speaker project (pictured in my other for sale ads and below). Price is £300 including UK shipping.

I am having trouble making my first post, I was going to do so in the introductions section, but could not type in the body section only the title.

I hate smd, and found these in my stash. This is what is offered:
2SK209-gr jfet 100pc
2SK2145-gr dual jfet 10pc
BSH111 mos 8pc
BSP129 mos 37pc

How about $40 for all? Including shipping in cont US.

I've had some diy floor standing speakers hanging around for quite a while, something I had to buy to get something else and have now decided to do something about them.

They have 2X Seas P21REX drivers per speakers and an Audax 25DT tweeter installed between them, the crossover I'm sure isn't correct as it just has a coil and capacitor installed, nothing else!

I'm sure some design must have been followed when building them can anyone shine a light on possible crossover designs etc?

It's been a long time since I posted here and I hope I'm not breaking a rule.
I have some unpopulated boards I made with a friend back in 2008 that I thought maybe some could make use of. I need to actually get a count of how many I have but there's a small quantity. Maybe 10 or 20.

They're setup to biamp a single speaker so there's four LM3886's to drive a woofer and then a single LM3886 to drive a tweeter.
They also have an optional crossover which, I think is a linkwitz-riley style and there's both a 12dB and 24dB. If that's not wanted there's pads for an RCA input jack directly into each amp.

I used a pair of these for many years until I finally gave them to a friend a few years ago. As far as I know, they're still working.
The board only has one modification which is I had to add a capacitor to the single LM3886 circuit, I think in the feedback loop to drop the DC offset as I was using it to directly drive a tweeter. The four LM3886's with the so called "servos" seemed to work beautifully on the two I built.

They were originally intended to be bolted onto the original rear panels of powdered advent speakers, but I also had plans to use them as stand alone amplifiers as well, it just never happened.

Anyone interested?

Hi All,

I’m looking to replace a .22R dual emitter resistor for a dynacord powermate 600 That has gone into protect mode.
1, 5w 0.22ohmn JX2

I’m Having bother finding one.

Is there a substitute I could use please?

I have confirmed 10 faulty components so far on one channel. The other channel is ok.

Thanks in advance

I am using my WiiM Pro in combination with other Linkplay products.
With the Linkplay modules (as implemented by Arylic/Up2Stream) , I am used to change the SSID naming by using UART passthrough software.

Question

1. Can I use the same software to change the default WiiM Pro SSID name into my own?
2. What command string should I use to do this?

Hi! Everybody knows Cirrus Logic DACs CS43131 and CS43198. Once I noticed a discrepancy between the sound of my CS43131 and its measurements. After some research, I came to the conclusion that its brilliant results are fake. I have not any source with CS43198, so it would be interesting if someone checked my findings with it.

Fake 1. 352kHz and 384kHz support
Both chips accept such streams, but few people noticed the fixed setting of digital filters for these modes: 0.263Fs. In other words, frequencies above 92.8/101kHz will not be played at all.

Fake 2. Noise I (THD+N)
The noise floor in wideband measurements, which is also rarely used, has a steep rise above 40 kHz.
On the FFT, the signal harmonic bases are more wide compared to, for example, es9038q2m.
I'm not an expert, just an advanced user. If this is not a consequence of active noise shaping, then at least it looks that way. That is, the real THD+N should be noticeably worse.

Fake 3. Noise II (DR)
According to the standard test, CS43131 shows a DR of at least 130dB(A), similar to good professional chips. It was unclear why I couldn't hear it. The following test was carried out. A 30kHz@0dB signal was mixed into the standard 1kHz@-60dB. 30kHz is far enough from the [20Hz-20000kHz] range so as not to interfere with the measurement too much.
Result DR=129.8dB(A)

The noise floor rose by almost 20dB!
Result DR=110.3dB(A)
This confirms the rumors about variable gain, I suppose.

I very briefly repeated this test on the ES9038Q2M to avoid an error.
Result DR=122.8dB(A)

Result DR=120.9dB(A)
In general, there is no difference of 20dB here.

Logic of Currus
Of course, I can't know it for sure. I believe the dynamic gain is needed for outstanding DR. The noise shaping helps to improve THD+N measurement. And the huge noise hump is reduced by a non-switchable filter. I don't want to blame the CS developers for anything. I just don't think the CS43131 is a high quality HiFi chip.


PS Many thanks to IVX for exellent equipment!

Hello.
I have theese dipped silver micas, 300v most are 1 % , there is 3 kilos, I would like to sell them as lot.
I have no idea about how many, but it's on the other side of 1000.
Was thinking 300 euro .
33pf 84.5pf 130pf 160pf 174pf 177pf 270pf 280pf 316pf 330pf 354pf 372pf 378pf 470pf 632pf 1120pf
1240pf 2920pf 1480pf 1500pf 4005pf 4008pf 4300pf 4340pf 4540pf 4860pf 4990pf 5500pf.

George's most recent advice is that the power transformer should be 700VCT (350-0-350). Looking at Hammond's potted offerings I see the 373XP rated at 700VCT @ 127mA:

• 5V/2A - this would tie me to the 5AR4 rectifier tube @1.9mA heater current but that's not a big deal to me.*
• 6.3V/4A - this should be sufficient: 2xKT88 =3.2A, 1x12AT7 =0.3A, Total 3.5A Other output tubes (EL34, KT66, etc) would need even less heater current.

Does anyone see a problem or caution with this?

Hammond 373XP

* Edit: Some other rectifier tubes run on 2A heater current but that would be right at the transformer max with no margin.

I would like to refurbish four subwoofers. Each was previously were outfitted with a class-AB plate amp, which unfortunately is terrible. I powered the plate amps from a 300VA transformer that has dual 45Vac secondaries, which translates to an unloaded DC secondary of about 63V, and I would like to re-use them (there is one in each subwoofer box). I would like to remove the remaining amp guts, re-build the power supply, retain that large heat sink from the old AB amp and mount the new amp module to it. I have lots of 100V can style caps that I can use to make a beefy linear power supply. I'm just looking for an amp module to work at this rail voltage. I would prefer not to add other DC driver voltages if possible, although I would consider that. The drivers will be 4R nominal 12" subwoofers.

I would like to keep the cost at or below $200 per amp module and am looking for at least 250W@4R. Perhaps there is an older ICEpower or UCD module (e.g. UCD400) that would be good when only used for subwoofer duty?

Other suggestions welcome!

Frist time trying replacing ferro fluid on old 1" soft dome tweeter and seek kind advice from experienced members.

When I google, there are several different ul (microliter) such as 100, 300, 650, 900ul. If I replace 1 inch dome tweeter, do I just need 100 microliter per each 1 inch dome tweeter? It looks like 300 ul is the most popular one from the number of units sold somehow.

And, how much filling the ferro fluid? My guess is that it is not to fill all the way up since voice coil needs to be going in then it will overflow.
Do I fill about half way and it is about right?

Thank you very much in advance and any advice would be hugely appreciated.

I purchased these with the intent of using them to restore an amplifier I no longer have.

Included in the sale:

20-2SC2326K-AA
20-2SA1016K
4-2SA1207
2-2SA1210
4-2SA970BL

Have a 1970's Quad Sanyo Receiver DC6100K with an early type 12 pin connector on the back -

Does anyone know more about the type of connector and what plug would have been used to marry them together.?!

By the way there is no manual (yet) ....still searching for one...must be one out there somewhere!

Thanks in advance

I have a James loudspeaker a2.1 amp with a humming noice on the .1 (Subwoofer) output, sounds very much like wind blowing and it comes and goes but never disapear complitly.
I have no idea what kind of amp it is but my gues is chip class ab or class d amp, it has a Switch mode power supply if it makes any differens.
Any suggestion where to start the localisation of the problem.
The sub channel has a phase 0/180 degree button on the front. When I press that button it gives som scratching noice.
My hope was a cold soldering but after trying to resolder the legs to that bitton it stays the same as before.
James loudspeaker does not answere my e-mail or messenger messages. I have no schematics for the amp.
Where to start?

Hi,
I have built my first speaker about 20 years ago, but I always built a ready plan or used the trial and error methode to build/improve something.
The speakers are quite good what I have now, but I feel, I need to dive deeper if I want to step further. I have started to learn what Thiele/Small parameters are, but don't fully understand yet, how to use them.

For me the following qualities are important in a speaker's sound:
1. Frequency response
2. Dynamics
3. Clean sound
4. Detailed sound stage
5. Good resolution

1: The frequency response is the easiest part since it is possible to correct it by a DSP. Currently I use wideband speakers, thats why I need some DSP correction.
4: The good sound stage comes from good phase response under 2-3kHz, but don't know what is above.
What about the other qualities? Could you please give me some advices, or a good reading/watching material?

Someone mentioned in a thread, that the detailed soundstage and the good resolution is not possible in the same time. What is the reason behind this?

In the aleph3's manual is written the peak power on 2 ohm :120 watt.
On stereophile the graphic is that an aleph3 give 32.8 on 8 ohm
55.8 on 4 ohm and 40.. on 2 ohm.
Ok but this is with a sinusoidal signal but what is the power impulsive on 2-4-8 ohm
it's because in the manual is written that the max output is 8 amp and 23 volt.
I can understand (but I know that is not so) the aleph3 give with an impulsive signal
120 watt on 2 ohm
240 watt on 4 ohm

It's impossible I know...
but what is real the power on the aleph3 in this condition?
Someone can help me?

piCorePlayer = piCore Linux + Raspberry Pi + Squeezelite + LMS

piCorePlayer is a dedicated Squeezebox player (like a Duet receiver) for your Raspberry Pi. It is built on a small read-only linux (Tiny Core/piCore) and Triodes excellent Squeezelite player. It is small, very small, only 75Mb.

December 12 2015

Please try the new release (piCorePlayer 1.22).
Ralphy has been a great support and help during the development - so thank you very much.

https://sites.google.com/site/picoreplayer/home/news

Changes:

• Updated kernel 4.1.12.
• Updated piCore (even faster booting).
• Touchscreen support improved (the official raspberry 7" touchscreen).
• Calibration file included.
• Jivelite can be installed from webpage.
• VU-Meters can be changed from webpage.
• New high quality default VU-Meter made by forum member Kolossos - thank you very much.
• Backlight on/off (Jivelite settings/screen/screensavers/when stopped/Display off ) then the backlight will be off when not playing, and on when you touch the screen.
• Ralphy is providing two versions of squeezelite. The basic version which is shipped with pCP allow playback of pcm, (wav/aiff), flac, mp3, ogg and aac. It is only 1 Mb in size. The ffmpeg version is bigger (12 MB) and allows in addition playback of ALAC and WMA via build in ffmpeg. In the Main page you can choose which version you will use.

After customizing Jivelite you need to save your changes to the next reboot. This is done on the webpage ("advanced tab" in the bottom and choose "backup").

Download

https://sites.google.com/site/picoreplayer/home/download

This software has been around for a couple of years now, but has a fairly low profile at diyAudio.

regards
Steen & Greg

Anyone know much about gauss meters?
Just wanting to measure strengths of permanent magnets for projects ranging from massive subwoofer builds to robotics? Neo, Ferrite magnets what ever.
Not to expensive maybe under $400 or $500 obviously cheaper the better like it doesn’t have to spot on accuracy but a reasonable one would be good!!

Any recommendations?
Cheers

Sound of various Pass designs

Nelson,

It would be interesting to know your thoughts on how the Sony VFET amps sounded vs the Pass SIT amp vs the current (and maybe past) Pass 240 based products, the F series and maybe even the Aleph sound.

Perhaps a short description of each and what that design did really well and perhaps what it could have done better. Also perhaps how it performed into low impedance loads.

I realize how each sounds is subjective and all have sounded good. However, since you're likely one of very few people who have heard each topology, your perspective on each would be great info to know. I also think it could be useful for folks buying Pass equipment (new or used) who are wondering how a particular piece might fit into their system. Finally, it would also help those interested in DIY who may be trying to determine what to build. Essentially, it could serve as a guide that would evolve over time and could even perhaps be a sticky.

I realize you have a long list of to-do's, but given the number of designs over the last five years or so, I think it would be very useful. As this site has grown, it's become very challenging to wade through thousands of posts on each design to try to determine how each compares to others.

Thanks,

Steve

Also got some 0.1 here all made by rubycon.
If they have no use in audio I will move them on, but I know people go crazy over paper oil caps, but don't want to hoard too much stuff!
They are rated at 1500V, so may be useful in high voltage circuits that use transmitter tubes perhaps?

To the point. I have a Glassware Aikido preamp that I have decided to sell for $500. Free shipping within lower 48 states. The unit was built with the following:
1) Manley Labs RCA jacks
2) All silver plated copper wiring.
3) Obbligato copper output caps 600V
4) Special connections to allow tube access to be easier for the owner
5) Glassware PS-21 Power supply made for this application
6) Quality Hammond chassis.

Quick question, can 2 opts have slightly different output gains? The oscilloscope shows me that one channel has a difference with the other, I exchange them and it changes

A little while ago I made a post for a part recommendation. They showed me a cool site with cool parts (http://www.jlsounds.com/). I may want to do a build that's nice and small some time down the line (gotta finish my current project first ). So, what are your favorite small form factor audio things?

I loaned out my G4700 and it came back damaged. sigh! The Treble knob and metal part that allows the knob to slide on has broken clean off level with the threads. Is there a way to permanently fix this with say, JB Weld or is there an easy replacement available? Sansui PN# 1015530. Any help will be greatly appreciated.

Hello

I wil make a volumepot in my poweramp
Ouputlevel cd-player is 2V at 50K
Impedance poweramp is +/- 40K
What is the most suiteble value for the pot 50 of 100K?




Thanks

Hi, Instead of one PNP and one NPN like in first photo , what if I only use a power PNP Darlington?.
Can I do this modification, would it work " just as good " ?.


PS: My "lab power supply " with lm2596 died, and why not use LM317 ?.


- Cheers, Bruno..

Hello. So I am the happy owner of a TA E86&TA N86 set and ever since I got the TA E86 preamp I have some strange issues with it, mainly when I cold start it.

After the 5-6 second delay from when I switch it on, there is a strong 1 minute of really strange noise, more specifically, there is some strong pink noise followed by a strange oscillating sound, just like when you play those 20hz -20khz sine waves, and then a pretty loud pop after which complete silence occurs. Turning it on and off after being on for some time does not replicate the sound. It only does this after it has been turned off for at least an hour or so.

The preamp has seen some servicing, some caps have been changed, but not all. To me, it sounds like a failing old cap that is charging, but looking at the schematics, after the 5-6 second mute sequence from the moment you power it on, there are three small caps on the power supply board that charge and those caps have been replaced.

I would appreciate a fresh input on the matter since it is pretty annoying and I really like this set so I want it fully working. Thank you!!

Hi, I built an amp that uses two smps 12v supplies fed into two 12v to 60-90v stepups creating a dual +-60-90v power supply for an irs2092s amplifier

If i wired 2 irs2092s chip amps in parallel to the dual supply instead of one, could I wire the amplifier outputs (bridge?) to get over 500w and how?

At the moment I'm just using one irs2092s amp that succesfully supplies a subwoofer with max 500w

Also I have the option to set the supply voltage from +-60v to +-90v
What's the safest voltage of the irs2092s amp that provides the best performance
Amp
Stepups
Smps

Hi! I am wondering if I could get some pointers on how to better use A&H ZEDi-10 as an USB interface with a Linux-based DAW for live sound. My current problem is a noticeable albeit small latency between the plucked guitar string and the sound from the monitors. I suppose it should be fixable because if it is noticeable for a beginner like me, it would be unusable for professionals.

I am a beginner, and I have finally gotten around to trying my newly acquired Allen & Heath ZED i-10FX mixer as an interface. It can send 4 independent channels via USB. I installed Ubuntu Studio distribution, with low-latency kernel, and trying with Ardour 6, which comes with it.

The interface work out of the box with this setup but I hear that delay. I know next to nothing about DAWs yet, I was barely able to figure out how to configure the Ardour session to receive and send the sound back. So, perhaps I need to adjust some parameters from defaults.

I use ALSA as sound engine/bus but I also tried JACK with no difference in the delay. Googling suggested that for simple use like mine - playing a single guitar through - there is no advantage of JACK over ALSA, and Ardour itself recommends ALSA.

I tried to calibrate the latency by plugging the monitor out into the guitar in and running the calibration in ardour - it worked, and I got 81 but I am not yet sure what it means, whether these are even milliseconds or frames or something else.

I am also using a pretty powerful i7 quad core 12th generation laptop, so I should not have a bottleneck there.

Any suggestions? Thanks!

Hi! I have Edifier s730 2.1 system based on TDA7294, 150W+75W+75W
I want to change the value of high pass filter for satelits, now is around 150hz, i want it from 80 hz
Can someone help me with changing the value of Capacitors and Rezistors , and what rezistors and capacitors to change,to get 80 hz frequency
Please help me guys, i am planning to change satelits and i want a good mid bass for my system.

I have some pots/attenuator that I currently have no need, so trying to find new homes for them.

All are shipped from Singapore, depending on my work schedule.
For any order more than $100, I’ll do free shipping. You could combine with my other T.I parts sale thread too.

1. Khozmo 48-steps Quad 10K
Perfectly for any balanced solid state preamps or headphone amplifiers. Brand new.
$230 shipped worldwide.

2. Noble 10K stereo
I have 4 of these. All come with pre-soldered boards but still unused. Much, much prefer the Noble to the Alps RK27.
$35/ea plus $12 shipping for whatever quantity.

3. Alps RK40 100K stereo
Another great pot. They no longer made these anymore, still a better choice than the TKD 2511.
This one is used and pre-soldered, fully working.
$50 plus $12 shipping.

I am not an engineer. But I do want to know was the exam hard or easy for you? What was your story?

3 x toroids transformer for sale,for data look on pictures.They are like new,verry little used.Price for all 3 would be 100 eu plus shipping inside EU.For questions or price offer contact me.

Hi ,
I was given these today along with a bunch of valves and other bits .
Can anyone tell me what they are please.

Heh Restomod... Going to try and document this here for others to follow / ignore as they see fit

Bought a Sony CDP-337 with a wonky mech. I already have a CDP-227 but this is a step up. Electrically similar is correct but doesn't tell the whole story at all...

that wonky mech first of all. Wonky, as in "drawer doesn't open" 🙁 You can YouTube but it was not quite so straightforward as I thought the lithium grease I had was too much for the rails, so don't do that! Grease for cogs thin oil for slides. Couples with new belts, the drawer now slides out of the player as it's supposed too.

There is a lot going on in this mech and it is satisfying to watch without the lid as the disk is lowered onto the spindle during the loading process

Finds and reads even CD-R's without fail

I'll be coming back to this as I progress...

Andy

I need to adjust the sensitivity of the analog meters on this ADC Sound Shaper Two equalizer. I have the schematic but the service manual I have is for the LED version so the calibration is different. See schematic I marked up: I marked the front panel adjustment (yes they are all the way up).

To me it looks like VR103 and VR104 will adjust the sensitivity of the meters. Am I correct?

I was wondering if anyone might have a schematic for this power amp? I have looked high and low to no avail. I have also tried SAE news groups too.

Thanks, Rick

My Aleph J sounds wonderful for the most part, but I have a couple of problems that I would like to address.
First one: with no input or output connected and the amp powered on everything looks normal meaning all the Leds are lit as they should be. When I power off the amp the PS Leds take about 1 minute to go completely out. However, with the speakers connected and I power off one side immediately goes dim while the other side is normal.
What could this be?

Second problem: if I reverse the input connections, I get no output from either channel, but the other way works perfectly. I have no idea what to look for to solve this issue.

any advice would be greatly appreciated!!

Im installing a Kenwood KDC-X705 along with a SKAR RP600.5 amp to replace the Harmon/Kardon factory junk of 27 years old. The RP600.5 fits perfectly lengthwise where the original was located and has the speaker connections that are perfect too. I like it because I intend to use the 5th channel for a KICKER 43C104-N bundle sub box.

I tried Skar 6.5 coaxials in the front doors and those were aweful sounding. Nothing there!
I've now swapped in TX6.5 loud speakers. Wow, what a difference! Those crank for a super budget price. Will they last and for how long?

The front doors can accomodate one 6.5" and one 4.5", each mounted close together and each has a separate wire from the original amp location.
I want to run the Skar TX4, mid/tweeter in the 4.5" location.
The vehicle has 4.5" speakers in the rear above the hatch in the headliner. I wanted to run those too, but substitute 6.5" somehow.
If I forgo the rears, I could use chs 3&4 for the TX4 mid/tweeters and tell the Kenwood Excelon to compensate via its crossover programming.
I want to combine the TX6.5 loudspeakers with the TX4's and possibly use a crossover (do they need it) and connect speakers in the rear, more TX6.5's

I've heard that I don't really need rear speakers but they are nice to have when the rear hatch is open too and more MID for that size speaker is nice.

Should I forget the rears and use the amp's 4 channels on the fronts only, or can I get away with powering the fronts together on 1&2 channels, and the two rears on the chs 3&4? Will a XO be needed on the front or can the AMP be tuned to compensate?

Skar TX6.5 RMS 150W 100-8000 Hz
Skar Tx4 RMS 60W (pair) 60-21,000Hz

I hope I made that clear.

Attached is an example of someone putting a Kicker 46CSC654 in the headliner.
Attached is the door configuration of the 6.5 and 4.5 speakers.

I have, in my infinite wisdom (please dont tell my wife), acquired 2 Counterpoint SA-12s. One has a blown mosfet in the left channel, the other has a blown mosfet in the right channel. Is it nuts to think about running the amps as one channel amps. Since the rail fuses and gate resistors are blown or fried, one channel is inoperative. I am assuming each channel produces approximately 40 watts. Should I also remove the 6 DJ8s from the inoperative channel? and the output fuse (s). Tell me why I should not, must not, can not do this?

$60 shipped in the US.

Hey everyone,

I'm in the process of building my first set of speakers. I started about six months ago and haven't had as much time as I wanted to work on them. Unfortunately I'm nearing the end of the cabinet build, and can't find my original notes on what I was actually going for. I've used WinISD and the various online websites, but they all give pretty different results using the same parameters. For example I think on Dayton's website for the RS180-8 it says for a Ported enclosure a volume of around 12.5L is ideal, but one of the online calculators says around 10L is best.

Anyways, I built enclosures that are roughly 13.9L without taking into account anything inside. Taking into account my bracing, the port volume, and the speakers themselves, I figure that puts me around 12.5L, which I imagine is what I originally set out to do since it's close to what Dayton recommends I think.

Putting that into WinISD and a box frequency of around 45Hz with a port of 4.3cm shows a port length of around 14cm and a 3dB frequency of around 46.5 Hz. Does that all sound right? My plan was to use the Monacor BR-50HP bassreflex port, which is 4.3cm x 141.mm, which is basically spot on.

Anything I'm missing here or should be doing differently? I can't increase the box size at this point, but I could drop it with some more bracing if for some reason that made sense.

Thanks.

i have BNIB pair of midwoofers and pair of midrange. (one MR is BNIB and the second used).

700USD for both shipped.

For sale
Whatsapp 079 068 5914

Started with LTSpice basically today on OSX. Drew up my first schematic, based on some reverse engineering of a tube amp I built yeears ago.
Entered the first stage, the phase splitter. Ran a simulation (.tran) with a 200Hz input @ 25 mV. Was expecting to see 2 signals 180 degrees out of phase on the outputs. But the simulation shows the both outputs in phase.
As this is a cathodyne circuit that would be impossible, and o'scope measurements confirm I get 2 inverted signals out. So I must be doing something wrong in LTSpice, but cant figure out what. ASC attached.
This is the sub file I'm using:
* * Generic triode model: 12AX7 * Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved. * Version 3.10, Generated on Sat Mar 8 22:41:09 2008 * Plate * | Grid * | | Cathode * | | | .SUBCKT 12AX7 A G K BGG GG 0 V=V(G,K)+0.59836683 BM1 M1 0 V=(0.0017172334*(URAMP(V(A,K))+1e-10)) ** -0.2685074 BM2 M2 0 V=(0.84817287*(URAMP(V(GG)+URAMP(V(A,K))/88.413802)+1e-10)) ** 1.7685074 BP P 0 V=0.001130216*(URAMP(V(GG)+URAMP(V(A,K))/104.24031)+1e-10) ** 1.5 BIK IK 0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.00071211506*V(M1)*V(M2) BIG IG 0 V=0.000565108*URAMP(V(G,K)) ** 1.5*(URAMP(V(G,K))/(URAMP(V(A,K))+URAMP(V(G,K)))*1.2+0.4) BIAK A K I=URAMP(V(IK,IG)-URAMP(V(IK,IG)-(0.00058141055*URAMP(V(A,K)) ** 1.5)))+1e-10*V(A,K) BIGK G K I=V(IG) * CAPS CGA G A 1.7p CGK G K 1.6p CAK A K 0.5p .ENDS

I also loaded the schematic in LTSpice in a windows VM , but result was the same.
Any hints appreciated.

Hi, I needed voltage regulators positive and negative 15v I think for my active filter ( high pass , low pass ) to power the op-amps.
This is all I could find at the moment in stock, are they fake? , china versions, Good enough to use them ? or should I trow them in the bin.

Also, how about just transformer - bridge rectifier - a couple of capacitors = dc -+ 12 - 15v ?. or you recommend Voltage regulators?.

I was on here maybe 15 years ago, no idea what my username was.

My dad's on here (Trigon?) and Daniel (his friend) they used to build stuff together. My dad built Nelson Pass Class A 100w Mono Block per speaker and custom KEF based standing speakers that were biwired as per 107.2 REF and the B220 woofers with the connected rod and Kef 104.2 Mid and Twitters. He sold those and recently is back with KEF 104.2 that he recapped, reinsulated and did the ferrofluid on.

Daniel built me a headphone mini amp years ago and he was building his own amps. He had if I recall Martin Logan standing speakers with custom fancy Raven ribbons and a bunch of other cool stuff including a fancy Vinyl player setup.

Me, well, I'm getting started, making a purchase for some KEF 107.2 tomorrow and will be on the hunt for a Class A amp suited for this puppy. On a budget right now, but long-term will want probably something like my dad's mono blocks.

I will use a minipc and feed out from high resolution TIDAL and FLAC files, so will be looking into some kind of PC DAC to AMP.

I will probably for the fun of it get a vinyl setup too down the line.

Are there technical ideas for designing a loudspeaker especially for current driven amplifiers? This could be special CFA amps or voltage driven amps with resistors in line.

I have some propositions on that topic.

Current drive with voltage driven amps can be realized with the "simple resistor method" as described by Esa Merilainen (website current drive info).

Nelson Pass tested this method with higher value resistors like 50 ohms. Merilainen describes first benefits putting a resistor with the same R like the driver 4 / 8 ohms in line with it.

Many voltage driven amps work with an impedance like 3 to 4 ohms giving most wattage.

A loudspeaker - for example a fullrange driver should have 1- 2 ohms voice coil resistance so that 2-3 ohms added push the amp into "beginning" current drive.

Putting several drivers parallel as a line driver would do the same concerning impedance but not everyone wants a line driver array.

Voltage driven amps with the simple resistor method can be a choice with loudspeakers having a Faraday / copper ring on the pole piece which brings distortion already down. Adding a resistor in line makes the sound better - very close to real CFA (current feedback amplifiers) amplifiers what I found out in a listening test.

Often Multi way speakers have resistances in line with tweeters and midrange drivers. That is the reason why many do not feel the need to try out current feedback amplifiers.

CFA amps would profit from special loudspeakers which have a lower mechanical Q. As the bass resonance is less controlled in this type of amps.

However all my tests with basic current feedback amps did not show any necessity for taming the resonance.

KiCad V7 is officially released
The blog announcement at
https://www.kicad.org/blog/2023/02/Version-7.0.0-Released/

There's a line array AMT design crossover at 125Hz from Arion.

You can see if you scroll down to the photo of the rear of the speaker, it's a bunch of AMT's in a U baffle.

Do you all think this is some custom AMT, or that you can just push any AMTs that low when you have 10 of them and active EQ?

Hello,

I need a small portable DAC to connect headphones to my Windows laptop.
I want an ASIO-compliant device with a classic USB-A port.

Anything to recommend?

Thank you.

I am researching this for an industrial application, and am trying to get some information as to what alloy the case on a 6V6 (metal) tube is.

Any particular alloys used with tubes, or nickel plating?

I called up Kreg tool to get a part number so that I may order a replacement for my 1/8th setup bar. Before I knew it the rep asked my shipping address and told me that the part will be shipping out this week. The didn't even want shipping cost.

Thanks Kreg tools
Jeremy

Hi
I have 75-100 pieces EL 82 / PL 82 tubes. They may then be used for anything other than taking place.

The Philips data sheet mentions 12W, Va = 200, Vg = 200, Raa = 4k in pp configuration.

Since I have so many, a 4 tubes amp is an option.

Are there any who have tried this tube?

Regards

Benny

Preparing a paper about active feedback, sharing these counter-intuitive results might give some insight in the operation of amplifiers.

Shown in the illustration, IOP1 and IOP3 (Tina-TI simulation, IOP='ideal opamp') have their inputs swapped, but not the active feedback operational amplifiers IOP2 and IOP4. The feedback network consisting of R2 and R3 are identical.

Both circuits behave as inverters, what was not immediately expected with the IOP1/IOP2 configuration, whereas it was obvious with the IOP3/IOP4 configuration.
To avoid lengthly derivations of formulas, consider the outputs of IOP2 and IOP4 as "Vz", being -(R2/R3)* Vout.
For the IOP1/IOP2 configuration, Vout = Ao * ( Vin - Vz ), which boils down to Au = -R3/R2!
For the IOP3/IOP4 configuration, Vout = Ao * ( Vz - Vin ), which boils down to Au = -R3/R2!

Concluding that not the forward configured amplifier (IOP1, IOP3) determines the overall performance, but the active (in this case) controller (IOP2, IOP4).
Notice that amplifiers in general behave less then perfect at extremes (high frequency, start up / shut down sequences, to name just those two), and the poltergeist Murphy (In Ravels Gaspard de la Nuit named Scarbo) can pop up everywhere, mostly quite unwanted...

Other more developed similar circuits (a passive feedback in IOP1/IOP3 or non-inverting feedback controlling IOP2/IOP4) show none to less favourable solutions, as a simple resistive divider and a buffer has proven already.

And I promised N. Pass a headstart, so here it is.
R1 is left out (obvious, no real zener here), μ is approx (R3/R2)^2.

as above.

I was browsing audiophonics.fr and came across these: https://www.audiophonics.fr/en/tran...for-toroidal-transformer-120x65mm-p-8969.html

unsure if it's for aesthetics only or it actually works to shield the transformer from the rest of the device.

Thanks

I'll skip the long backstory. Is it possible/feasible to build a subwoofer into this corner fireplace/TV area? The rough volume is about 60 cu ft. (equilateral triangle with two 56" sides yielding an 80" face, about 75" tall after a divider is accounted for). Yes I know it's not an ideal sub box, but we're trying to maximize space and avoid building an entirely separate box just to sit on top of, what is effectively, a giant box. Also, the sides are about as rigid as you get (framed house exterior on two sides, thick tile on the face) so that's a big plus!

We're not looking for crazy high SPL, more concerned with extremely low bass and overall SQ vs an off-the-shelf solution. I'd love to get flat to 35hz if possible. Since it's lower SPL, we're hoping the fireplace wont' rattle, but it's a risk we're willing to take.

1. Is this at all feasible or just completely ridiculous?
2. If feasible, what driver would you recommend?
3. Ports? Batting? Any other suggestions to maximize results (given obvious constraints).
4. Even after all that, are we likely to get better results from a MUCH smaller, but properly designed and/or built 15" or maybe even 18" sub? I'd like to go passive, so something like a JBL MRX or EV (I come from the pro audio world, so not too familiar with equivalent home stereo boxes)

Thanks fellas!

Need help here. Can someone help me connect the grey power supply wire - 2 cables, one with a red line and one not, both register voltage going through them - to the motor board? Where do the grey wires go? To the white box or the black box behind it and where on the appropriate box? This is a replacement motor that somebody gave me for my dead one and has this white connector box. In my old motor the grey power supply wires connected to the black box where the red and orange wires connect to. When I put my multimeter cables on the orange or red connection on the black box I can't find another input that is connected (beeps).





Thanks.

I started to design my own speakers during the pandemic and went a bit wild with buying drivers so I am having a clearout of parts I don't think I'll ever use.

six Beyma 15P80ND
two recone kits

One of the speakers is damaged from mishandling and was a superglue job at the time. They have never been using in anger!

I was going to replace the cone and so have two recone kits with one spare if the first repair was no good! I never got around to it.

I'm offering these amazing drivers for £1200 for the six + recone kits.

Collection from Nottingham only.

So I just built the Gt102 and the Pr102. All I can say is WOW, maybe think about selling my tube crap...LOL…

All I can say is they are incredible. My Pensils sound like they are in another dimension...wow...

I don't know of any other MC cartridge where the recommended load impedance in the specifications covers such a wide range (between 30Ω and 50.000Ω resp. 50KΩ). Maybe a missprint ?

According the frequency response (go to the attached files) the a lower value arround 30Ω-40Ω seems more likely to me (as long as the measurement for frequency response was carried out without using a load impedance).

Under
https://forum.audiogon.com/discussions/thoughts-on-the-madrigal-carnegie-one
I read this:
During the reorganization of Benz, a collaboration was arranged between Van den Hul, Mori and Lukaschek. Lukaschek already worked for Benz, and Mori was well-regarded for his contribution in the development of the Sony XL55 cartridge which employed a novel coil. Everyone knows about A.J.Van den Hul, of course. The work of the men resulted in the production of the Benz Silver, the Van den Hul One, and the Madrigal Carnegie One.

Like the Sony moving coil, the Carnegie One has an unusual figure eight coil design. Another feature is that the Madrigal has a layered cantilever made from carbon fiber, beryllium, and aluminum. No other cartridge that I am aware of ever used this exact cantilever composition.
The cartridge shares a common tip with Van den Hul models, the true line contact that Van den Hul designed.

Like the Sony, many examples tend to be low-riders over time. That said, if it doesn't ride low in the groove now you will probably be okay with it. If it does ride low, however, take a pass because the body is not easily opened for repair. That is the only mechanical downside that comes to mind. I own two, and one came as a low-rider. Check it before you buy it.

How does it sound? Everyone has a flavor he prefers, but reviewers at the time considered the Madrigal Carnegie One to be one of the most neutral cartridges ever made, and most of those guys ended up with one in his stockpile. I find the sound to be very clean, but not overly exciting. Still, it is a nice cartridge worth owning that is still capable of beating the performance of a lot of today's offerings.

If you get it, it has a Dynamic Compliance of 17 x 10-6 cm/Dyne, so it will work well with a wide range of tonearms. As far as VTF goes, mine seems to like 1.6-1.7 grams. I haven't used it in awhile, so I can't tell you exactly where I used it last, but it in that range.

Under
http://www.pladespilleren.dk/HIGHfidelity/HF 1987-3 Carnegie One VdH MC10.pdf
there was reviewed this cartridge together with Shinon Red, VDH MC10 and Kuetsu Rosewood Signature (mounted on a SME V ton arm)

But I don't find any advice concerning the best suited load impedance.

More URLs:
https://www.audioasylum.com/audio/vinyl/messages/72/723119.html
https://www.audioasylum.com/audio/vinyl/messages/72/723168.html
http://www.koerner.de/michael/Sony_Yoshihisa_Mori.html (BENZ)
https://www.stereonet.com/forums/topic/114837-fs-madrigal-carnegie-one-mc-cartridge/ (Load Impedance: 47K)
https://www.vinylengine.com/turntable_forum/viewtopic.php?t=65980 (Load Impedance 40 Ohms)
https://www.canuckaudiomart.com/det...drigal-carnegie-1-moving-coil/images/3413056/ (30 ohms to 50K)
https://www.vinylengine.com/turntable_forum/viewtopic.php?t=65980
https://audiokarma.org/forums/index.php?threads/madrigal-carnegie-one-lomc-cart-levinson.43927/
https://pinkfishmedia.net/forum/threads/mark-levinson-madrigal-carnegie-one-not-working.109859/


both this cartridge and LMC-1 from Luxman - go to
https://audio-database.com/LUXMAN/etc/lmc-1.html
https://www.hifido.co.jp/sold/05-24854-58469-00.html?LNG=E
https://audio-database.com/LUXMAN/etc/lmc-1.html
seems to be a derivat (rebadged version) from SONY's XL-MC7 - go to
https://images.hifido.co.jp/14/046/04675/b.jpg
https://i.pinimg.com/originals/81/94/d1/8194d155578ffac0dc6e2e21b0dd11d6.jpg
- at least according various URLs like those under
https://forum.audiogon.com/discussions/luxman-releasing-a-mc-cart-in-japan?sort_order=desc
and
http://webcache.googleusercontent.c...org/sony-XL-MC1.html&hl=de&gl=de&client=opera

If this is right, the electrical characteristic compare to the Carnegie ONE are nearly the same, then the recommended load impedance on Luxman's LMC-1 according
https://audio-database.com/LUXMAN/etc/lmc-1.html
https://www.hifispeaker.wiki/item/sony-xl-mc7
is a good start for investigate the sonic behavior:
Head amplifier : 40 Ω or more
Step-up transformer : 3 Ω or more.

Concerning SONY's XL-MC7 - go to
https://www.hifispeaker.wiki/item/sony-xl-mc7
http://20cheaddatebase.web.fc2.com/needie/NDSONY/XL-MC7.html
is no mentioned different resistor values between step up transformer and head amp use (30 ohms coil imp.,100 ohm or more for load impedance).

Where I can find the correct information regarded the right load impedance (maybe there are test reviews, who this is explain) ?
Thank you very much in advance.

P.S.: various MC cartridges need in additional a capacitor for a flat frequency response - go to
http://www.extremephono.com/Loading.htm (fig. 2).
Maybe even this cartridge ?

Hi

Has anyone measured the noise of the LND150, or created whatever noise-related spec goes into a spice model for LTspice?

The manufacturer primarily describes it as a high-voltage switch or lamp ballast device, and ... oh yeh... it can be used in linear applications. Being a mosfet, I expect it to be ten times noisier than an average n-jfet, but some real data would be nice to have.

Thanks 🙂

I've not posted here before but just lurking and learning.
I had a question regarding the installation into a 1995 Range Rover Classic.

I've read people think Skar is trash and some think its value for the bucks. My rig is fun to drive but needs music to muffle the road noise, so there is that.

I think I'll head on over to the Car Audio section and see if anybody has experience with installing in my vehicle.

Hook'em horns!

I’m looking for the SAE, Science Audio Electronic schematic for the following items. I’m converting the following items from 220V back to 110V because I’m moving back to the Unite States.



5000 Impulse Noise Reduction system 110V

2800 Parametric Equalizer 110V.

8000 FM Tuner 110V

2100L Preamplifier 110V

2400L Amplifier 110V

No, I’m not looking to use a DC servo with a gainclone. Just considering using them AS a DC servo amp where a very low output impedance must be maintained. Not looking for massive output current but higher than +/-15 volt rails IS required As well as fractional ohm Zout (ruling out NE5532). +/-30 to 45 would be nice, more correction range the better.

Is the LM1875 or 3875 my best bet, or should I keep researching? It will be used in a loop with a separate differential integrator, and probably set to a DC gain of around 20.

Hi all

just bought this tonearm with some other bits but I don't know what it is. Possibly SONY? Any one help?
thanks

When using an equalizer I often get to a band where there is no music content. Mostly in acoustic trios or other simple recordings. Sometimes i can almost turn it from 12 db plus to minus without hearing a difference.

Please let your suggestions flow. Be it full sounding pieces/recordings or tunes that are revealing in a more narrow band. Perfect or in aspects perfect recordings.

Most importantly: SWEEET MUSIC!!!

- Unless you have a good reason it deserves representation even though it sounds like a sick rooster.

Come come!
Cheers!

so i have a very low level noise from the speakers and an odd cenario
The amp trips the breaker if i depress the EQ defeat switch

Took me a while to grasp the different between car audio and home audio, and why car speakers aren't great in a large space.

So, how do outdoor speakers compare to car/home audio.

Yes, materials used are different. Sound quality is sacrificed for more durable components. Are they still suitable indoors ?

Good evening all!

My Oris 250 horns and Celestion AXI2050’s are in and I’ve set them up with an active crossover at 388hz.

However, my bass enclosures and drivers are still at least 1-3 months out.

That said- I have two Acoustic Elegance TD18H+ 4ohm drivers I purchased off a member here-

What would be the quickest down and dirty way to utilize them only temporarily for the woofer / bass portion of this setup?

Open Baffle? Quick Sealed Enclosure ?

Thoughts?

I am too impatient to let these sit for 3 months with no midbass!

Thanks in advance.