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Multi-Way Conventional loudspeakers with crossovers

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Old 22nd April 2002, 11:25 PM   #11
jmiyake is offline jmiyake  United States
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Location: San Jose, Ca.
Smile Wow some really impressive projects here!

My next project is a pair of line arrays, based off of Jim Griffin's and Rick Craig's Linus Array design. A couple of minor modifications. 2 more tweeters added to the lines, and probably a different mid-woofer. Also I may increase the height of the speaker to bring up the top of the line source a bit. Jim Griffin and Rick Craig have been great about providing information and suggestions.

After that I will need to think about a center channel to mesh with the pair. Hmmm. It will take some thought.

James
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Old 23rd April 2002, 12:51 AM   #12
Keld is offline Keld  Sweden
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Location: Borås, Sweden, Tellus
Default Re: Full-range speaka'

Quote:
Originally posted by Bose(o)
I'm building a single full-range driver system using Radioshack (Fostex) 4" drivers. I'll be using a right-angle triangle cabinet and will have an exit on the bottom. I can't wait to hear it, it's looking good with only three coats of gloss-black paint. I really, really want a piano finsih on it.
Hi
I would like to hear more about your speaker project: What driver(FE 127?)? Is it a ML TQWT or just open pipe or vented or...?? . I am asking because I am planning to build a smal (thin) full-range driver speaker that should be supported by a 10" sub, just now I'm sitting with Martin Kings MathCad sheets for ML TQWT and they are driving me nuts. I just dont seem be able to get those graphs where I wont them. Any input/ideas would be nice.

Keld
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Old 23rd April 2002, 01:33 AM   #13
Bose(o) is offline Bose(o)  Canada
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Default Full-range project

I'm using a voigt pipe that will be very similar to the one on the page below. Yes, I am using the Fostex FE127 mostly because I have heard it before (used as mids in a system) and liked their dispersion of sound. I also chose the Fostex driver because my neighbour wouldn't let me get the Audax drivers (the people that I was buying from, Solen, screwed up his orders badly). So, anyway...my system will only be five feet or so high so I may be lacking in the low freq's, but I'll figure out something. Here is the website that acted as my guide through my first journey into DIY'dom. "The JOKE" I'm honoured to help you.

Bose(o)
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Old 23rd April 2002, 06:51 AM   #14
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My next project, if i ever get my ordered units that is....., is a basreflex/TL thingy design using 3" TangBand full range units suggested by a nice fellow on the net. Going cheap this time but less $ dont mean less fun

Cheers // Doxa
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Old 23rd April 2002, 07:54 AM   #15
Variac is offline Variac  United States
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Default Fostex Tower

A tower with the Fostex FF225K

This is their 8" driver without a whizzer cone so it rolls off about 10K
I found a Vifa dome unit that has a flat resonance peak from 10k to 20k up to about 96 dB which I'll use as a super tweeter.

I'll let the big driver roll off naturally and use a filter to cut off the tweeter below 9 or 10k I figure I'll get better very high end this way than trying to do the whole thing with one driver.

This Fostex driver also has a much smoother response than the
FE 208 Sigma, and has a bit more bass. Who knows how it will sound? I will I guess, when I get it made.

First Madisound has to get the FF225K in stock. They say "any day now" Maybe I'll have them help me with the super tweeter
filter too.
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Old 23rd April 2002, 08:43 AM   #16
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Location: Wellington, New Zealand
Tri-Amped System With Digital Crossover and Eq

With the recent discussions about FIR filters and digital crossovers, I realised such a system is very feasible, within the grasp of many DIYers. Such a system could be constructed from a moderate PC with 3 soundcards, such as those from Midiman or RME, both of whom support multiple soundcard ins one PC, with synch-aligned output and true 24bit 96kHz output.
The system will read a digital or analog input from the source (currently a SP/DIF signal from my CD player), and output the filtered and room EQed signal to the three outputs for playback.
The software is not too daunting, especially with existing software such as the performance libraries from Intel.com and looking at existing code such as BruteFIR (Linux only though)

The nice thing is it is scalable. It would be possible to start with a single analog soundcard and amplifier, then as time and money permits, add extra Amps and drive them from a standard active crossover, and then in the future add extra digital out soundcards and DAC's etc. It would be easy (and desiable) to have the computer in a seperate room, as long as the digital signals can be driven along the cables, it should work fine. I can see myself building line drivers for the spdif signals.

Of course, it will all be in vain if the analog equipment isn't up to spec, so it's going to be some form of Pass amplification for the Mid's and High's, and something class AB on the Bass. And of course the power supply will be my 2x 2.9kW switchmode rectifiers. (How am I going to get rid of the heat of 4 channels of SE Class A amplification, Heatsinks, Water cooling, Fans, wife acceptance factor, arrrgggghhhh!)

Cheers, Adrian
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Old 23rd April 2002, 02:47 PM   #17
Bill F. is offline Bill F.  United States
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Default Dipole/infinite-baffle

The "Auction Special"

Thanks to a too-good-to-pass-up internet auction, I've got 25 car audio bass drivers from 10 to 18 inches (mostly 15s) and two electronic crossover units with variable boost at 40 Hz. What's a DIYer to do?

Build a big ol' tri-amped dipole/infinite-baffle system, that's what.

I'm going to slap together two folded dipole bass baffles, ala Linkwitz, and load them with 4 15" Kicker sub drivers each. Just a touch of inline resistance will bring their total Q to 0.5--transient perfect, critically damped. I'll lowpass 'em with the electronic crossovers and equalize the dipole rolloff with the bass boost. Tweaked just so, they'll be flat to 40Hz. with a steep rolloff below. Piggybacking the crossovers will yield a 4th-order lowpass at 200Hz.

On top of the dipole bass cabs, I'm shopping for coaxials, like a set of 12" Tannoy golds, if I can get them, or maybe I'll have to settle for the Selenium coax from Parts Express. It's hard to argue with the transient and polar response benefits of a coaxial. Staying true to the theme, I'll run the coaxials atop the bass cabs in dipole baffles defining a rolloff point that compliments the bass dipole arrays.

Dipoles are known for bass quality, not quantity or depth. For room locking, pressure-cooker sub bass below 40Hz, I'm going to have to get medieval on my living room. What I plan to do is take four more of those 15" Kicker bass drivers and put them in an infinite baffle, for a (linear) displacement of 225 cubic inches per cycle.

I'll fab a manifold with cutouts on four sides, mount the drivers, and attach it between floor joists in the crawlspace under my living room, firing up through a large floor register. The opposed mounting scheme should cancel most of the manifold vibration. Again, with a little resistance, the infinite baffle can be dialed in to a Q of 0.5. With a 40 Hz. lowpass, response models flat to 22 Hz. and only about 8dB down at 10 Hz. while efficiency hovers around 97 dB/W. In my living room, this will actually be a rising response, so I'll probably end up rolling off the lower end to get flat response.


Bill
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Old 23rd April 2002, 03:09 PM   #18
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Join Date: Dec 2001
Location: Milano, Italy
Complete the refinement of my home system:

Low (sub) : 6th order bandpass with Ciare 15"
MidLow : closed labyrinth with Focal 5k515
Mid : Dynaudio D54AF
High : Dynaudio D21AF

All-Passive x-over 1st or 2nd order (depending on the speaker) + compensations.

The speaker is done since January, but now is the typical time of the neverending small tweaks (increase a bit the male voice range, trim a bit down the upper mid etc.). This will continue until either I will be fed up or somebody will set fire to the whole basement. Unlikely that I will be 100% satisfied, it's part of the game!

Next I'm going to build for a friend a small/thin/tall 3 ways (Ciare 8" in QB3 reflex, 4" ScanSpeak mid and 19mm ScanSpeak tw) shaped more or less like an inverted flute glass.
X-over will be 2nd order passive, but this is only the first draft, we'll see (hear) how it works once the thing is done.

sandro
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Old 23rd April 2002, 09:57 PM   #19
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bose, i like the voight pipe in your link and i think i'll build a pair to as soon as my amp is done. i think that they will work good with the low power tube amp i'm doing.


cheers, mike
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Old 23rd April 2002, 10:16 PM   #20
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I'm doing a conical speaker using SEAS elements. A visual and audial experiment. URL=http://www.mtek.chalmers.se/~rask/speaker.jpg]See it for yourself![/URL]
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