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General speaker questions for audio and home theater.

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parameters that establish woofer efficiency

Posted by Duke on September 25, 2002 at 12:48:06:
Richard -
You wrote: "I'd like to know why a lower efficiency driver gets the same extension in a smaller box - I thought it would be the other way around??"
Three major driver parameters influence the efficiency of a driver (and of course each of these parameters are in turn established by other parameters):
1. Efficiency goes up linearly as Vas goes up.
2. Efficiency goes down linearly as Qes goes down.
3. Efficiency goes up with the CUBE (third power!) of the driver's resonant frequency.
All of these things work against the low bass response in a given box size. If Vas goes up, then the in-box system resonance goes up. If Qes goes down, then the alignment is shifted to one with less bass response. And of course if the driver's resonant frequency goes up, it produces less low bass.
I have an idea for a woofer that I think would come as close as possible to filling your requirements and be within your budget. Please e-mail me at audiokinesis@cox.net and I'll discuss it with you.
Best of luck to you!
Duke