Adding subwoofers in the crawlspace? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 9 Old 11-26-2019, 10:47 PM - Thread Starter
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Adding subwoofers in the crawlspace?

I have a crawlspace, about 2 feet of clearance underneath my TV room. I have a couple of TC Sounds 15inch subs laying around and a spare behringer ep4000 amp. If I stuff those subs in a small enclosure and place them right underneath the seating area, no one will ever know they're down there, but would it add any bass? Maybe vibrate the floor a little more? Add a feeling like there's subs behind? Floors are pretty thick with insulation, not sure enough would come thru.

Worth trying?
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post #2 of 9 Old 11-27-2019, 06:59 AM
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No harm in trying, since you already have all the equipment needed.

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post #3 of 9 Old 11-27-2019, 12:55 PM
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post #4 of 9 Old 11-27-2019, 01:45 PM - Thread Starter
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Quote:
Originally Posted by Alan P View Post
How about re-purposing the spare subs and amp with a BOSS?
Dont have room since the seats are right up against the rear wall. 😞
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post #5 of 9 Old 11-27-2019, 01:58 PM
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Quote:
Originally Posted by pavelbarchuk View Post
Quote:
Originally Posted by Alan P View Post
How about re-purposing the spare subs and amp with a BOSS?
Dont have room since the seats are right up against the rear wall. 😞
I believe the BOSS goes under your seats

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post #6 of 9 Old 11-27-2019, 02:50 PM
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Originally Posted by Darren Chan View Post
I believe the BOSS goes under your seats
Correct. With as little as 1.5" rise. Check the thread I linked to for more info!
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post #7 of 9 Old 11-27-2019, 02:54 PM
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I would think that the floor would have insulation under it. You'd have to remove it from that spot and have to sub right up close to the floor.
Doubt much will be felt but if you don't have a long way to crawl to get to the right spot and long enough cables, try it.
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post #8 of 9 Old 11-27-2019, 11:15 PM
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Subs should excite the room air space only. Placing them inside other things, such as cabinets and closets "works" but is asking for trouble because you will shake every single item that is not glued/nailed down like wires, pipes, building construction fragments, nails the carpenters dropped, etc. and these can buzz, rattle, and resonate audibly.
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post #9 of 9 Old 12-07-2019, 10:30 PM
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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.

Dennis
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