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post #1 of 15 Old 04-12-2019, 01:13 PM - Thread Starter
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Platform behind screen

I'm building a platform behind my screen wall to support my LCRs and a Sub. Can the cavity of the platform be hollow? Or is it best to fill it with something?
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post #2 of 15 Old 04-12-2019, 04:00 PM
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It will resonate, fill it. How big is it?
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post #3 of 15 Old 04-12-2019, 08:31 PM
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Platform behind screen

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Originally Posted by orby2000 View Post
I'm building a platform behind my screen wall to support my LCRs and a Sub. Can the cavity of the platform be hollow? Or is it best to fill it with something?

Fill it







...with more subs

Really though. Think of it like the stage. Some people even fill those with sand to stop the resonance that big mentioned. That’s probably why he’s asking about its size. I’m sure he’s got a solution to fit your needs.
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post #4 of 15 Old 04-13-2019, 05:48 AM - Thread Starter
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It's a rectangle approx 80" L x 25" W x 35" T I was planning to build it to sit my LCRs and a sub behind an AT screen
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post #5 of 15 Old 04-13-2019, 06:18 AM
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You could build wall mounted shelves for your mains and leave the sub on a rubber pad on the floor. A lot less lumber.
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post #6 of 15 Old 04-13-2019, 06:37 AM - Thread Starter
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Thanks Big. Probably best to do that, but would the sub below rattle the shelves above? I thought a box might be more stable?
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post #7 of 15 Old 04-13-2019, 06:44 AM
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really nothing to rattle, the entire front wall should also be treated with absorption
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post #8 of 15 Old 04-13-2019, 06:47 AM
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Originally Posted by orby2000 View Post
Thanks Big. Probably best to do that, but would the sub below rattle the shelves above? I thought a box might be more stable?

You could also just build three pedestal boxes for the mains, I throw a bag of sand in, bag and all for the ones I build.
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post #9 of 15 Old 04-17-2019, 01:23 PM - Thread Starter
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Quote:
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You could also just build three pedestal boxes for the mains, I throw a bag of sand in, bag and all for the ones I build.
Big,
would hanging bats of fiberglass to fill my cavity accomplish the same goal as using 2 layers of Linacoustic to treat my front wall (behind AT screen). The cheapest 100' roll of Lin. I can find within 50 miles is $260 within 50 miles of me. Obviously , the Linacoustic is neater...
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post #10 of 15 Old 04-17-2019, 01:32 PM
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short answer is yes, put it should be unwrapped, you might also want to consider Roxul, or Bonded cotton insulation.

but you can look at the data yourself:
https://www.bobgolds.com/AbsorptionCoefficients.htm
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post #11 of 15 Old 04-20-2019, 12:28 PM - Thread Starter
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Quote:
Originally Posted by BIGmouthinDC View Post
short answer is yes, put it should be unwrapped, you might also want to consider Roxul, or Bonded cotton insulation.

but you can look at the data yourself:
https://www.bobgolds.com/AbsorptionCoefficients.htm
Technically, if I have left over Linacoustic, could I do another layer or two, sandwiched with plastic each time? Or is there diminishing returns at a certain point?
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post #12 of 15 Old 04-20-2019, 02:11 PM
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I'm not aware of any data on that, I think it falls under the category "can't hurt"
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post #13 of 15 Old 04-20-2019, 04:34 PM
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Ever consider going in with someone else, and splitting the cost?

Folding hanging batts of fiberglass might not be the best idea if you think about fiberglass potential becoming airborne and ingested.
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post #14 of 15 Old 04-20-2019, 07:54 PM
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just cover with a fabric
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post #15 of 15 Old 04-21-2019, 04:05 AM
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A breathable fabric cover will still allow fiberglass strands to become airborne. (I wonder if the insulation made from old jeans would be a better choice???)

The Savoy does have some rope suspended, folded over batts up front, behind the AT screen. I expect they are there to knock off any harsh leading transients
of a potent sound system and reduce slap echoes.
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