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Multi-Way Conventional loudspeakers with crossovers

Cloning a 00 Speaker for 0
Cloning a 00 Speaker for 0
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Old 12th March 2010, 08:04 PM   #11
yakmurph is offline yakmurph  United States
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My two cents:

I've had my Alesis buyout dome tweeters in my home made plywood
S.A.W. lenses for a few years now.

Go for it.

Try the concept out with some modeling clay first, for proof, like I did.

Horn loaded (with the S.A.W. lens), the domes are much more efficient,
so plan to pad them down to match your mid/woof.

You're gonna love it!
I do.

-Steve
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Old 12th March 2010, 08:50 PM   #12
freddi is offline freddi  United States
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Cloning a 00 Speaker for 0
hi Steve - what are good and easy ways to make the tweeter (and midrange) lenses? where did the gain occur? what are good dimensions for the cavity and slot? might you show your plywood lens? Freddy

Last edited by freddi; 12th March 2010 at 09:08 PM.
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Old 17th March 2010, 08:03 PM   #13
mosconiac is offline mosconiac  United States
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At first this ALT looked complicated to make, but on second look it's kinda easy. Start with a 3-1/2" ball, cut it in 1/2, cut it 1/2 again (think: 1/4 slice of watermelon), trim out a phase-plug-shaped opening (1-1/2" radius) for the tweeter, and then make the "visor" (using leftover material) using the same 1-1/2" radius.

The base of the phase-plug-shaped opening is only 3/4" with a slight relief at the base (1").
Click the image to open in full size.
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Old 17th March 2010, 08:22 PM   #14
freddi is offline freddi  United States
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nice - do you have an estimate of its side view and ellipse crossection? look at Beovox 7-4 center speaker with a flat front lens
http://cdx.dexigner.com/article/5365...b_7_4___01.jpg
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Old 17th March 2010, 08:28 PM   #15
MaVo is offline MaVo  Germany
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Dont want to spoil the fun, but theres alot of sharp corners in this design, especially the high frequency dispersion thing, so i dont see how it could be low diffraction. And above that, it looks like an omni device, which is said to be problematic in rooms.

EDIT: just realized you want to use it in a car. i dont know how omni designs work in a car, but as the boundaries are even closer, i think you will listen to alot of very early reflections with omni speakers.

Last edited by MaVo; 17th March 2010 at 08:33 PM.
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Old 22nd March 2010, 04:16 PM   #16
mosconiac is offline mosconiac  United States
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Looks like we have a thread-killer.
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Old 22nd March 2010, 10:28 PM   #17
cuibono is offline cuibono  United States
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I bought something similar last year - some company had designed this fancy gaming speaker system, but the company was folded for some reason, and they dumped their inventory. I got two working systems, pretty cheap, and they look to be about the same idea. The thing is called the Spherex Xbox 5.1, and was reviewed in the Audio Critic. I attached a diagram of one of the speakers.

The thing is basically an omni radiator, and I see the top 'lenses' as high frequency reflectors. The overall sound is fine - not superb, not bad.

Personally, I don't find omni radiators my preferred radiation pattern - I hear too much ambience, and not enough direct sound. I might add here that I've been using SLs Pluto speakers for a number of years (also omni radiation), and prefer dipole speakers.

I've been wanting to get a better system in my car sometime too. Some time back, I got a ride in a fancy Cadillac - it had pretty nice sound! It was a surround system, and in retrospect, it seems like that would be a great way to deal with such a small space, and such uneven distances between the speakers and the listener(s).
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Old 23rd March 2010, 06:10 PM   #18
Studio Au is offline Studio Au  United Kingdom
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Good thread, I hope you make progress.

Eventually I want to try and build almost every 'type' of speaker, open baffle, full range, horn loaded electrostatics etc.......and have racked my brains as to how to do omni which seems to be the main focus of the B&O speakers.

I purchased these, from my now growing obsession with Ikea parts:

Click the image to open in full size.

Was going to use them as is, with a tweeter firing up into it. Duevel Planets ish. The ones I have fit a standard tweeter inside, you could implement them like the image above.

I also considered casting the interior, and then carving out the phase plug shape. However distractions and other projects are stealing my priorities.

Good luck.
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Old 23rd March 2010, 06:38 PM   #19
freddi is offline freddi  United States
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a few years ago I spent about 10 seconds to get a lens for an upfiring helper tweeter - there's a cavity and a slot involved

Click the image to open in full size.
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Old 17th April 2010, 04:01 PM   #20
Juanhanded is offline Juanhanded
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Quote:
Originally Posted by Patrick Bateman View Post
I am very happy with my home speakers, but I've been working for the past few years to get some of that magic in my car. I've tried everything from tractrix horns to Unity waveguides, and everything in between. Recently I stumbled across a design which looks promising, so thought I'd document how to clone it.

Click the image to open in full size.

The speaker is a Beolab3. It uses an unusual enclosure shape to reduce diffraction, and an acoustic lens and waveguide to shape the polar response of the tweeter.

PB...do you feel that you have taken the waveguide as far as you want to take it? What are the unity waveguide limitations that have led you into this new direction?

And where can I find a primer on the principles at work in the Beolab speaker?

Do you believe that the acoustic lens will be OK in the mobile environment? (well I guess Aston Martin does.)
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