Wisdom Audio's new woofers

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studiotech

studiotech

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Joined 2004
#1
Has anyone else seen Mr. Bohlender's new woofer for his in-wall speakers? He showed me a sample at the CES convention and I was highly impressed. It is about 4" wide and 18" long with a big flat diaphragm. The voice coil is nearly the same size as the diaphragm so it gets driven over its whole surface. Kind of like a track field shape. I believe the magnets are neo and the frame is super chunky, like a boat anchor plus a big Xmax. He says it has a pretty high Q so I started to salivate at the possiblity of some dipoles with these..... Maybe it will work really well and someone will do a similar version for us all to enjoy.

Greg
 
#3
How do I figure?

Well, as oppossed to say a 6*9 driver that has a 1" vioce coil, I would say that a driver that has a coil that is nearly 2" by 12" qualifies, wouldn't you? This is the set-up that Wisdom is using for its new inwall woofers.

Greg
 
#4
I find it hard to qualify the statement that a diaphragm is driven over its whole surface when that diaphragm is moved by ANY kind of voice coil. Are you trying to say that a larger voice coil couples better than a small one? Fine, I can accept that. But saying that a voice coil that does NOT directly apply a force over the entire diaphragm DOES, slightly irks me.
 
#5
OK, fine, I see your point....it's NOT the ENTIRE suface, but come on. You KNEW what I meant right? I mean, if i mention a voice coil at all, we know that it is driven only at the point where it attaches to the cone, so why the big deal? Sorry I didn't say, "driven over a large percentage of it surface"

greg
 
#8
454Casull said:
And that isn't quite precise, either. If the voice coil is nearly the same size as the diaphragm, then it's kind of like a huge dome, and the middle will be prone to resonance (I think).
Click to expand...


a quick look at it shows that a cone nominally supported/driven at one central point will be extremely prone to resonances...

a stiff flat surface driven along the periphery will have a far better chance of not having as many break up resonances...

at least that's imho...

_-_-bear :Pawprint:
 
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