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Discussion Starter · #1 ·
Hi,


I'm building a HT section in a home and need to know what to do about the floor. Originally, that section was supposed to be a slab, but from reading around, a raised floor improves the sound, especially the LFE.


What I'm trying to find out is how much should I sink the slab for a raised floor? Also, does anyone have ideas about the best way to construct such a floor? The portion of the room used for HT is about 17' x 20', but one of the 20' sides partially opens 10' into a stairwell. Ceiling height is 9-10' in the HT section.


I'd appreciate any advice someone could give on either of these issues.


Regards,

Chi
 

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Quote:
Originally posted by piney
Hi,


I'm building a HT section in a home and need to know what to do about the floor. Originally, that section was supposed to be a slab, but from reading around, a raised floor improves the sound, especially the LFE.


What I'm trying to find out is how much should I sink the slab for a raised floor? Also, does anyone have ideas about the best way to construct such a floor? The portion of the room used for HT is about 17' x 20', but one of the 20' sides partially opens 10' into a stairwell. Ceiling height is 9-10' in the HT section.


I'd appreciate any advice someone could give on either of these issues.


Regards,

Chi
You haven't been reading around here, because I think the general consensus has been to NOT do a false floor. Why do you think it improves LFE? Your subwoofer is designed to move air, not vibrate the floor for bass transference.
 

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Discussion Starter · #3 ·
You're correct about not reading around on this particular forum. Searches for raised floors didn't yield any posts about this either.


Why do I think a wood floor should be better than a slab? Even though there's no air between my feet and the floor or my back and the seat, I can feel the LFE in both places so it must be conducting through something.


Are you saying that a HT benefits more from a concrete slab rather than a wood floor with a crawlspace? At a minimum, it seems like the crawlspace would better isolate sound from the rest of the house, but I don't want to take anything for granted.


Thanks,

Chi
 

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Here are some links to some threads that may help you to make your decision. As for 'feeling' bass and potential problems with a subfloor, Brucer summed it up well in one of the threads:


"Better subwoofer cabinets are built with bracing and other techniques to minimize cabinet vibrations. Picture a 200 liter enclosure and an 18" driver. The total surface area of the enclosure is at least 30 X (times) the surface area of the speaker cone itself. If the cabinet walls vibrate at 1/30 th of the amount of the woofer cones you will get the same level (SPL) coming from the cabinet as from the woofer. And it will be noise that extends will above the frequency range of the subwoofer itself. Extend this senario to an entire floor and you could be cooking up some serious 'nasty' sounds.


Clean ultra low frequency signals (with enough SPL) will cause enough particle motion in your body alone to make you realize that it is really low bass sounds, that you would not be well served to color that sound with vibrating panels through-out your room."

http://www.avsforum.com/avs-vb/showt...hreadid=233530

http://www.avsforum.com/avs-vb/showt...hreadid=170824

http://www.avsforum.com/avs-vb/showt...threadid=18191

http://www.avsforum.com/avs-vb/showt...hreadid=224646

http://www.avsforum.com/avs-vb/showt...hreadid=194786

http://www.avsforum.com/avs-vb/showt...hreadid=188302
 
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