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Old 4th February 2012, 03:51 PM   #41
gootee is online now gootee  United States
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Quote:
Originally Posted by Few View Post

<snipped>

I fear that DC current-based measurements may lead us astray, depending on what we think we'll learn from them. Resonances within the driver's bandwidth (or even outside that bandwidth if driven acoustically, as Bolserst pointed out) are likely to lead to larger displacements than the rest of the frequency range and DC measurements won't reflect that effect. I think AC signals will be necessary to measure displacement limitations. I do agree an adjustable diaphragm-to-magnet distance would be handy. I hope to build a system with interchangeable spacers for that reason.

Thanks again for the links.
Few
Concur.
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Old 23rd February 2012, 01:08 AM   #42
Few is offline Few  United States
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I've come up with a promising way of stacking Fiskar rotary cutting blades, spaced with fender washers, with the purpose of cutting conductors with uniform width and spacing. A whole array of ten parallel conductors can be cut in one swipe. The prototype is ugly but quick tests suggest the approach has merit. Too bad the rotary blades are priced as if they were made of platinum.

Does anyone know how wide the Magneplanar quasi-ribbon midrange drivers are in, say, the 3.7? I haven't been able to dig that up despite multiple web searches. I'm not intent on duplicating their dimensions but they would provide useful baselines.

Also, the online owner's manual for the 3.7 doesn't specify the crossover frequencies. Does anyone happen to know what they are?

Thanks for any info you can provide.
Few

Last edited by Few; 23rd February 2012 at 01:10 AM.
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Old 27th February 2012, 02:15 AM   #43
gootee is online now gootee  United States
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Have you looked on the planar speaker asylum?

I'd guess 0.1 inch.
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Old 28th February 2012, 02:01 AM   #44
Few is offline Few  United States
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I'm looking for the width of the entire midrange diaphragm. I'm guessing it's something like 3" but that's based on absolutely nothing.

I've posted a similar question at the Planar Circle but haven't gotten any nibbles yet.
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Old 28th February 2012, 02:47 AM   #45
Few is offline Few  United States
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This interesting example of a central tweeter in a planar magnetic system just popped up in another diyAudio thread. I thought I'd cite it here in case others have an interest in the original point of this thread. It's clearly different from the tall narrow aspect ratio I'm pursuing, but their design suggests the intermodulation distortion discussed earlier in this discussion was deemed to be a concern.
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Old 29th February 2012, 01:19 AM   #46
gootee is online now gootee  United States
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Quote:
Originally Posted by Few View Post
I'm looking for the width of the entire midrange diaphragm. I'm guessing it's something like 3" but that's based on absolutely nothing.

I've posted a similar question at the Planar Circle but haven't gotten any nibbles yet.
The Planar Speaker Asylum (and Magnepan Users Group) is at:

The Planar Speaker Asylum

I think that just the QR foil tweeter section on my Magnepan MG-12/QR speakers is at least that wide (I'm TDY at the moment and can't check). I would have to guess that a mid-range would be wider. But I could be wrong.

Last edited by gootee; 29th February 2012 at 01:22 AM.
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