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subs on a slab ?

i have read here that subs on a slab is not a good thing, vs being on a framed floor.

i am wondering why this would be ?

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Quote:
Originally Posted by Fabricator View Post
i have read here that subs on a slab is not a good thing, vs being on a framed floor.

i am wondering why this would be ?
Hi,

It is because concrete doesn't transmit tactile energy (vibrations) in the same way that a raised wood floor does. There are advantages and disadvantages, though, to both approaches. Wood conveys much more tactile energy, through a chair or sofa, than concrete does. But, that energy transfer can also cause walls, which connect to the wood floor, to vibrate more, and other things in the room to rattle. Being on a thick concrete slab does, however, require more subwoofage, frequently in the form of ported subs, to obtain the same tactile sensations that a person on a raised wood floor will experience with smaller and less powerful sealed subs.

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Mike
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Would building a stage with your subs on it on a raised wood floor change the room response at all?
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post #4 of 4 Old Today, 08:46 AM - Thread Starter
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ok, i could understand that it doesn't transmit as much energy. but i am thinking that it would keep more of it in the room, so it would be better.

i used to be on a slab, it was a modern condo (apartment type).
the floor is slab on grade, the wall behind screen, behind that is a laundry/furnace room and a walk in shower bathroom . beyond that is a double cement block wall. the ceiling is flexi-core = tensioned concrete.
massive room gain.

those subs in that room where pretty darned nice. i have since moved into a house, all stick framing.
those subs, even behind the chairs, not so good. this house is a bass sponge.

so, i guess it was the combination that did it for me.
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