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Discussion Starter · #1 ·
I am building a 12' X 6'6" X 12" riser. I would like to turn this into a bass trap. In order to turn it into a bass trap, I will be adding vents to the back of the riser. I am also building a 4" riser on top of this one just for the seats. This second riser is where the vents should go. Should I leave the back of the 4" riser open and have the vents there? Is there another way to do this? Thx
 

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My understanding, (which is some degree of partial,) is that you use the open cavity of the riser, which is filled with fluffy fiberglass insulation, to absorb the sound energy of the bass. Therefore, you would want your 12" riser doing the absorption, not the 4" one. When I built the riser in my room, I used a layer of 3/4" plywood, roofing felt, 1/2" plywood, roofing felt, 3/4" plywood. two full inches of plywood is solid as hell. cutting vents in it won't weaken it.
 

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Discussion Starter · #5 ·
My understanding, (which is some degree of partial,) is that you use the open cavity of the riser, which is filled with fluffy fiberglass insulation, to absorb the sound energy of the bass. Therefore, you would want your 12" riser doing the absorption, not the 4" one. When I built the riser in my room, I used a layer of 3/4" plywood, roofing felt, 1/2" plywood, roofing felt, 3/4" plywood. two full inches of plywood is solid as hell. cutting vents in it won't weaken it.
Thanks. I am only using 3/4" plywood on top.
 
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