Filter
Hi all. I have posted some requests on this site for help I think only on person bothered to assist some. I have another query to the members here in case someone is inclined to help with this one
I am looking to build this filter but I need some help in determining the filter point. I need a filter point of around 200-300hz. This is for a boombox type ting
Thanks and regards
Randy
Hi all. I have posted some requests on this site for help I think only on person bothered to assist some. I have another query to the members here in case someone is inclined to help with this one
I am looking to build this filter but I need some help in determining the filter point. I need a filter point of around 200-300hz. This is for a boombox type ting
Thanks and regards
Randy
Looks like no one left here knows about these things or joining forums to engage in such things. No requests for assistance, pointers, learning or suggestions are receiving any interest. Hope everyone not too busy stroking the rear firing ports on their ML-TL-LLCOOLJ. BTW, Long hair dampening of the ports is so 80s!!!
Time to find another forum
Time to find another forum
I thought about reacting in your other thread. But when you expressed your impatience after only one and a half days after posting your first questions I lost 'my appetite' to react in that thread.
Yesterday I did search for a schematic of a subwoofer-out circuit with a filter/crossover frequency inside the range you wish, eventhough solid state electronics is not really my thing. Now you expressed your impatience within 16 hours after you started this thread. So I lost 'my appetite' again, and now for good.
Succes with finding another forum.
Yesterday I did search for a schematic of a subwoofer-out circuit with a filter/crossover frequency inside the range you wish, eventhough solid state electronics is not really my thing. Now you expressed your impatience within 16 hours after you started this thread. So I lost 'my appetite' again, and now for good.
Succes with finding another forum.
To keep cost at a reasonable level, I suggest you consider an active crossover. A somewhat optimalized crossover frequency can only be determined by looking at the drivers involved and the enclosure you intend to use (size, tuning etc.).
Not enough data.
If you lack data and you are using salvaged parts that is a good thing to do, but in that case you should make some measurements to see exactly what you're dealing with.
OTOH an easy way out would be getting a cheap 2.1 channel small amp with TPA3118 or TPA325x plenty of those around, if you want some control and learn more about crossovers and their effects I suggest trying DSP.
BTW looking at your other threads I am wondering if you wouldn't be better off getting a cheap external soundcard, or perhaps just a mixer with USB connection. One of the cheapest with 4 instrument/mic inputs might be the Behringer Xenyx X1204. If you are dead-set on doing everything DIY then that's a wonderful thing, but I suspect your daughter just wants to play together with her friends and all this "stuff" might take the focus off that. Something like for instance the X1204 would be a complete recording studio if you combine it with a PC and some free or cheap recording software. You probably know that you can get PC's for free if you know where to look and know how to refurbish them.
As an alternative to the X1204 I think the t.mix xmix 1202 (from the Thomann shop) looks nice, seems you can also record directly to an SD card apparently.
It can be hard to make something cheaper than the cheapest mixers when all the effort and costs have been put together, I applaud you for trying, but personally I would pick another battle.
Wish you good luck in your endeavours.
Was trying to edit my previous post but I was too slow...
If you want a quick and easy way out perhaps I would consider the Yamaha Stagepas 400BT, it does not seem to have USB, but everything else is there, speakers, amplifier, connect a lot of intruments, relatively lightweight, basic EQ for each, sub output so you can add one later on.
If you want a quick and easy way out perhaps I would consider the Yamaha Stagepas 400BT, it does not seem to have USB, but everything else is there, speakers, amplifier, connect a lot of intruments, relatively lightweight, basic EQ for each, sub output so you can add one later on.
Hey man, have some humor re (-;
Its not about days ignored, rather replies for views!! I am sure there are many here who can calculate filter networks on the fly but hold back even though going through the motions of registering on a "forum". I cut my teeth on hosting and administering forums
No problem calculating a filter, but you're not specifying enough data. If you want a passive line filter filter you need to specify the output impedance of the pre stage and the input impedance of the power stage. If you want to know the frequency you should use for the crossover you need to look at the drivers and possibly calculate an enclosure first. If you want an active filter you should get a kit with all the parts included, plenty of those around, or you can get a crossover box like the Rane AC23S if you want to tweak knobs a bit. DSP is also a good option that can be cheap.
If you want to get a solution cheap and easy, and don't care about precision:
I suggest you do a search for "2.1 amplifier" with either of these chips sorted by cost: TPA3116, TPA3118, TPA3250, TPA3251, TPA3255
Hey man, thanks for the suggestions. For my second project, I have ordered and received a 400wrms DVC 10" driver and a pair of 6.5" coaxial rated 100wrms each. And today, ordering an apparently better than average 3255 4 channel board. I thot to post a link to this board to see if knowing folks could spot any negative issues with it, but it seems senseless with the lack of interaction going on. Found a 4 channel one that should power these three drivers with lots of headroom ability. Also have received a bunch of tubes and sockets. I have come up with a way to acoustically voice control a low frequency enclosure of up to around infrasonic to 600hz with on the fly adjustability. This is the area I have put a lot of effort in. I am holding off from starting on that project as I want to learn more about small signal requirements first by fooling around with DIY stuff like my enquiry here
My current project is to make use of this Logitech Z623 which I regard highly for its effortless, authoritative musical ability with bass guitar dominant genres like reggae and its dubs, it cost $10 AU. I do have a Xenyx 1204 in storage, the USB interface on it kept crashing and finally stopped working. I ordered the FX one when overseas and the Victorian shop sent the plain one and then forced a credit for the difference. I use a Yamaha MGP12x now and have been pondering a Yamaha AG06 for fitting to this cabinet for a while, similar to your suggestions and found some similar cheaper ones that have onboard USB flash or SD recording
This will be used by three eight-year-olds and their mums or a senior aged music teacher from the school. She is great with the music book, but not so with the complicated equipment. I will not be present at practice. Bass, treble, level, volume, rec, play stop and next would be all the controls needed for them to go ahead and make music and get better at it than getting frustrated with fiddling controls. I have mentioned this in the past and thot folks here would very well understand and champion that cause as it makes so much sense. Also, this is not about making cheaper, I just spent $50AUD getting the component list and power supply component list to build the circuit I asked about in post 1 of this thread. I could have bought a 2.1 'preamp' board for $10. I spent another $80 over the last few days in components alone, so I could mess around with the other jfet pres and tones and such. I really do want to get more familiar with the before the power amp stages
The girls have all the instruments and amps at school and ultimate access to a well setup home studio here. This will be something more personal and hopefully fun
The article author mentioned that he did not bother to calculate the filter points, so I thot to ask here if someone may oblige. The link is the first word "Filter" in blue as per the hyperlink insertion of this forum. I presumed that prolific contributors here would recognise a line in blue as a link
Okay, so setup 1 is for School use?
I do not see any mention of high pass filter for the tops, highly recommend that, and seeing as they are coaxials, do you have any passive filters for them (important to protect the tweeter)?
Personally I would get a DSP setup for this, then I would be able to tweak and correct stuff if needed, try different eq settings, crossover types and steepness as well as frequencies at will.
https://www.parts-express.com/home-a-v/Home-Audio-Components/Digital-Signal-Processing
If you want Analog the diy audio store has a nice crossover from Nelson Pass.
https://diyaudiostore.com/collections/crossovers/products/diy-biamp-6-24-crossover
I seem to remember he also mentioned making a new kit with some bass/treble attenuation as well, but it's not available yet.
If you did not already invest in all that stuff I would rather get an amplifier with DSP integrated to make my life easier and not have so many boxes.
And setup 2 is for home practice?
I presume you're happy with this, and you just want some fx like distortion and play with filter circuits.
Nelson also made this very nice H2 generator if you're interested, should make the bass seem "fuller", especially on a small setup like that Logitech.
https://diyaudiostore.com/collections/newest-releases/products/h2-harmonic-generator
Big system setup 1; accumulated most parts to build my dream bass amp. One with the ability to reproduce every fret or key with authority and musicality plus my development of an adjustable acoustic voice control, i.e. from very warm to very dark. I am working towards bag loads of euphonic distortion too with over driven tube poweramp and picking up the signal after the transformer somehow to re amplify via class d, hence two channels of 3255 for the DVC fed by hopefully a distorting tube pre AND power amp. The coaxial have outboard x-overs and two sets of terminals per driver, not them single cap tings. I will also need to implement a subsonic filter for the subsection too at some point that is adjustable. Dream is to fit a peizo pickup, a transducer pickup as well as a mic pickup to the cab and a DI type electronic pass through with a four channel DIY mixer balancing those and outputting a recording signal
The DSP that I am thinking of using is the PRV 2.4x as it seems to be a good cabinet mount design as well as great value. Do you know of this one? I'll have a good read up on the Pass x-over, thanks for the tip. I will end up needing the DSP on this as at the very DARK settings the system comes into music monitor and PA territory so a digital system that can save a profile will be great to convert it from an instrument coloring amp to a music playback boom box
The tops for both systems will be filtered. I thot that the schematic in the link I posted covers high pass for the mains too?!! I may not have enough ability to read that schematic correctly then
I have converted my home built J-bass to discrete pickup outputs using a stereo TRS socket for each pickup over each channel. This goes to two separate channels on my Yamaha mixer console, so I can effect each pickup separately. Our original Z623 is attached to that mixer as sub/bass monitor and Aaron AP-3's as main monitors. This will get augmented with system 1 eventually A Roland JDXI synth is the main effects unit with its instrument input connected to the effects loop of the Yamaha mixer, and I am waiting for Roland to see if they do an MX2, then my dub station will be complete 🙂
System 2 Z623 bargain find; Found this for $10. Missing the controls box. I managed to decode the DB15 and now have full access to the unit's built in power amp. Took quite an effort as I had to learn to use the multimeter too for doing this. We are VERY happy with the sound of the bass from this sub, it shakes the rafters of my neighbours house!! at higher levels. It reproduces anything that Robbie Shakespeare played with emotional satisfaction with output levels as well as musicality. Just need to set basic pres, tone, mixer, 2.1 filter, recording interface in that order and house it all in one common enclosure for our functional amp. My lil girl says that the amps at school are weak and boring to play on and that all the ones she tried up to $1699AUD in our local music shop are also weak and boring to play on
She asks where is the bass, they are supposed to be amplifiers for bass guitars, but why do they not sound like bass guitars on recorded music? She is 8yrs old in primary school yr 4 and learning the electric and the double at school as well as U-bass and keyboard too at home. She appears to enjoy plugged into the home studio more than the school amps
Of course, I devour reading material and am very self-taught in quite a few areas, but I must say that sometimes it helps when folks explain something out or suggest options that may not be immediately obvious. Would you dispute this in your righteous outrage over my seeming impatience?
Everyone can log off and learn from books, then? Forum is here for showing off purposes only, then? Similar topics above and below mine get spoon-fed by responders while my query drops further out of sight? Would you dispute this in your righteous outrage too? I'll only say that you may not see the spirit of forums as I do. I have founded two popular Australian forums with international audience over the years and have taken them to inc operated association status as legit clubs, so I do know how to read a forum's mood and I find that I might be wielding this language that I am not native to better than many. I speak politely, even when making dirty jokes. I do not have the capacity to use crass words, and I have the ability to laugh at myself. Hope you are less outraged now. I am not here to vex anyone
That should have whatever you need to do for crossovers and EQ, not familiar with it, but it's probably decent enough. Both a blessing and a curse that it's only configurable through the menu system. Seems you cannot use it with a PC to adjust everything properly.
I was a bit rushed when I checked the link, so only saw the lowermost schematic.
It should be fine, BUT why do you need that when you're going for the PRV 2.4x? Seems redundant.
Ah, the PRV 2.4x is for system 1 master section. That is, taking the stereo mix bus and applying master EQ and filter to the discrete amp modules for a one enclosure 2.1 setup. The thing to be aware with this is that the master bus will be fed by at least three mono channel inputs. It's these mono channels that I am trying to learn DIY pres and tones for. Apart for the master bus DSP, everything in before the 3255 power amp modules will be tube based
The schematic that I posted in this thread is for the Z623 based system 2. This system is my playground too for learning about pre stages, hence my determination to implement something DIY
I wish someone would assist by taking a look at the circuit and help me move forward by helping to calculate the filter points that has been designed into that, plus offer some recommendations to change values to implement a 20hz to 300hz pass band for the sub output channel. I would be very grateful
Thanks and regards
Randy
Okay, system 1 = sorted
System 2
If you would like to learn about filters and that specific circuit I would suggest you read about it yourself, plenty of literature on the subject. Please see the reply from tvrgeek.
I do see it's mentioned an option on that page to make the filter variable, if that is what you seek I would urge you to try and make sense of it yourself, I am not proficient in these things personally but it should be fairly basic with the help of above-mentioned literature.
Sorry about that non-reply, but if you truly would like to understand these things that is the path you should go.
This PDF from Nelson Pass about the filter I linked to previously also has some nice explanations:
https://www.firstwatt.com/pdf/art_diy biamp_6-24_ crossover.pdf
OTOH:
If you would like a 2.1 preamplifier that is not DSP and "cheap" is an important factor, DIY from scratch is not the best value per buck.
https://www.yuan-jing.com/2-1-channels-ne5532-audio-tuning-boardIn many cases, especially for a one-off project, you would easily exceed the cost of a similarly performing DSP unit, except for the fact that the DSP unit would have a lot more features.
Edit:
I also noticed that PRV provides some basic solutions to your problem, something like the EX3.5 should cover your needs just fine.
https://prvaudio.com/products/ex3-5-stereo-crossover/
System 2
If you would like to learn about filters and that specific circuit I would suggest you read about it yourself, plenty of literature on the subject. Please see the reply from tvrgeek.
I do see it's mentioned an option on that page to make the filter variable, if that is what you seek I would urge you to try and make sense of it yourself, I am not proficient in these things personally but it should be fairly basic with the help of above-mentioned literature.
Sorry about that non-reply, but if you truly would like to understand these things that is the path you should go.
This PDF from Nelson Pass about the filter I linked to previously also has some nice explanations:
https://www.firstwatt.com/pdf/art_diy biamp_6-24_ crossover.pdf
OTOH:
If you would like a 2.1 preamplifier that is not DSP and "cheap" is an important factor, DIY from scratch is not the best value per buck.
https://www.yuan-jing.com/2-1-channels-ne5532-audio-tuning-boardIn many cases, especially for a one-off project, you would easily exceed the cost of a similarly performing DSP unit, except for the fact that the DSP unit would have a lot more features.
Edit:
I also noticed that PRV provides some basic solutions to your problem, something like the EX3.5 should cover your needs just fine.
https://prvaudio.com/products/ex3-5-stereo-crossover/
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I would like to try to further understand how to make something like the EX3.5
I thot I would start by asking for assistance in helping validate if the chosen schematic is suitable for the Z623 because as with current personal knowledge level I cannot authoritivally make that decision. I am however trying my best to learn that knowledge for myself as I do not enjoy demeaning myself asking for help where even the OP is ignored
Does the OPamp book teach filters? I am coming across information that I can recognise as being applicable for further reading after online conversations like this more and more
I have been trying to learn more but I do not know how to verify if what I think is right is right without asking
I thot I would start by asking for assistance in helping validate if the chosen schematic is suitable for the Z623 because as with current personal knowledge level I cannot authoritivally make that decision. I am however trying my best to learn that knowledge for myself as I do not enjoy demeaning myself asking for help where even the OP is ignored
Does the OPamp book teach filters? I am coming across information that I can recognise as being applicable for further reading after online conversations like this more and more
I have been trying to learn more but I do not know how to verify if what I think is right is right without asking
I really think you should start with the PDF I posted just to get a general feel for what's going on.
If you want a better understanding about "filters" exclusively, I suggest you start by looking at PLLXO's (Passive Line Level CrossOver), which is basically just the filter part.
If you break it down most of the active analog filters are just a PLLXO with a buffer or two, so it's more or less the same thing.
http://www.t-linespeakers.org/tech/filters/passiveHLxo.htmlhttps://www.sound-au.com/articles/pllxo.htm
Edit:
In case you missed it, you can download a spreadsheet calculator from the t-linespeakers.org link.
Edit2:
I also really, really like Rane's note 147 on the topic of Bessel filters, it's so informative!
https://www.ranecommercial.com/legacy/note147.html
If you want a better understanding about "filters" exclusively, I suggest you start by looking at PLLXO's (Passive Line Level CrossOver), which is basically just the filter part.
If you break it down most of the active analog filters are just a PLLXO with a buffer or two, so it's more or less the same thing.
http://www.t-linespeakers.org/tech/filters/passiveHLxo.htmlhttps://www.sound-au.com/articles/pllxo.htm
Edit:
In case you missed it, you can download a spreadsheet calculator from the t-linespeakers.org link.
Edit2:
I also really, really like Rane's note 147 on the topic of Bessel filters, it's so informative!
https://www.ranecommercial.com/legacy/note147.html
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Hey man, thank you. I hadn’t come across that term PLLXO before. I’ll look into your suggested material. I came across Ltspice, I think this will help me too. Hopefully I will be able to find how to work out the filter points for that schematic and do a point to point solder up today. I hope I can work out value substitutions to get more target of 300hz today before the local electronics store closes