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4-21-2011:  This is going to be a more formidable task than expected.  I've been playing around with suspending the panels such that they move freely and it's not as easy as it looks.  I'm going to keep experimenting but in the end I might give up and just put a couple dozen 18" drivers in the attic for the IB woofer.  The hard part will be finding woofers with low enough distortion.  Maybe that fan woofer thing isn't such a bad idea but the thing just cost too much!

11/25/10:  I've been drawing up ideas for the "Sub-subwoofer".  It's coming out to be 96 ft ^2 surface area so a little short of equaling one hundred 15" woofers..  I figure just a few mm excursion will be more than enough.  The woofers will be opposed mounted completely decoupled to eliminate transferring any mechanical energy.  I'll weigh them down quite a bit to keep them from going anywhere.  Since they will be canceling each others energy it shouldn't be a problem anyway.  It will be driven by a total of twenty four woofers yet to be selected.  I would like to cross out of this system at 18 Hz, the lowest room mode but for convenience I might cross them at 25 Hz, the lowest setting of the Anthem D2 processor. (Unless I can talk Anthem into lowering the crossover option to 18 Hz but that won't happen because they already think I'm a flake)  I don't plan to put any sort of rumble filter on the system, I'll just push it as low as it can go, hopefully 6 ~ 7 Hz or lower.  I think 5 Hz would be good.  I'm not sure what I will use to power them but I have a number of amplifiers laying around.  Probably about 10 watts/woofer is enough.  I might use one of my Anthem P2's letting each channel power 12 woofers.

Note:  Based on calculations from D.B. (Don) Keele adjusted for my room volume, I should be able to hit approximately 126 dB at 5 Hz assuming perfectly rigid walls etc.  The wall studs are 2x6 but they are certainly not rigid and thus will allow some loss.  Still, it should be adequate.

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