Join Date: Sep 2001
Location: Portland, Oregon
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Randomly browsing through the forum, I stumbled upon this thread. Well now, this is a subject close to my heart. I've been a proponent of under-floor sub-woofers since about 1978 when I was in the disco business. Some booths were slightly elevated and I put woofers under them. It just added a little more kick to the disco beat.
In that same era, I also used to be in the pipe organ/pizza business. Having a large pipe organ capable of producing notes in the 32 to 16Hz octave range, I made many recordings of the organ and wanted my home sound system to be capable of reproducing those very low frequencies with the intensity of the live instrument.
To achieve that I had built, two reflex enclosures of 27 cubic feet each, and each loaded with two Aura 18" NS18-992-4A drivers. I power them with two Crown XTi4000 amplifiers configured in bridged mono mode, totaling about 6000 watts. I refer to them as augmented bass speakers rather that LFE speakers although they do work just fine for explosions in action movies. My Trinnov 16 channel audio processor limits their high frequency cutoff to 40Hz so they don't interfere or muddy the more common bass frequencies..
As m.zillch said, doing this, "will shake every single item that is not glued or nailed down...." In my case, crystal glasses in our china cabinet freely dance about their shelves much to my wife's chagrin. If I really get cranking, a large plate glass window's accelerometer sets off the burglar alarm.
As opposed to the immediacy of Butt Kickers, under-floor sub-woofers generate an all permeating environment of whole body tactile sensation. Admittedly, my approach to audio/video is not everyone's cup of tea but a few mavericks in our hobby to keep it interesting can't be a bad thing.