soundproof home theater

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  #1  
Old 03-22-06, 03:59 AM
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Red face soundproof home theater

My Ht room has 4 walls that are 6" thick. I know I need to add another layer of drywall spaced a couple of inches from the cement wall with insulation in between to add to isolation. Ive listed below different ways to do it and I wanna know which one should I use.

1) 2X4 framed not touching the cement wall spaced 1" from the cement wall. Top plate screwed to ceiling joist and lower plate nailed to cement floor. Fill cavities with rigid fiberglass or rockwool then cover with drywall.

2) Same as above but instead of 2x4 I use 2X3 so it wont eat up too much of my side walls.

3) Option 1 but cavities not filled fully with insulation. Rigid fiberglass or rockwool is spaced 1" from cement wall then wood studs then drywall.
 
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  #2  
Old 03-22-06, 06:07 AM
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Vinyl Sound Barrier is more effective for blocking sound than and sound absorber like fiberglass or rockwool (which aren't the best absorbers anyway)
<img src="http://www.acousticsfirst.com/images/vinyl.gif">
It's only 1/8" thick, so it's not very intrusive, and it's much more effective then an air pocket w/ or w/o more traditional insulation
You can attach it to the drywall, then drywall right over it
 
  #3  
Old 03-22-06, 06:22 AM
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I read somewhere that mass loaded vinyl isnt very good at sound isolation. Besides Im from Asia and I dont think we have that product here.
 
  #4  
Old 03-22-06, 06:52 AM
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It's way better than Rigid fiberglass or rockwool lol
But anything will help
Just thought I'd throw it out there, let you know some options
 
  #5  
Old 03-22-06, 07:06 AM
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Thanks...so what you're saying is 6" cement walls is just not enough? Ive had some people tell me that I wont need to do any more soundproofing coz the thick cement walls will provide good isolation.
 
  #6  
Old 03-22-06, 07:27 AM
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Originally Posted by ciotime
I know I need to add another layer of drywall spaced a couple of inches from the cement wall with insulation in between to add to isolation.
Actually, you said it

"Enough" sound proofing is a personal thing
I really can't tell you if it's enough or not

Also it cannot be done over the Internet
With the proper measurements and pictures an acoustician could give you a great idea how to soundproof a room
I suspect you would consider what he/she come up with over-kill
Most people don't want/need that much sound-proofing

If you want more 'proofing, I can tell you how
If you need more absorption, rather than 'proofing, I can make suggestions

For example:
If in your home theatre, you like the volume up and the settings on "medium rock band" mode, then there's a good chance you'll need some absorbs on on those walls, (perhaps more so then blocking)

Those concrete walls echo the worst frequencies

I'd put the VSB up for 'proofing, then the rockwool (actually I would use a different product-same idea though), then the drywall

Then, depending on the rest of the room, echoes, freq., and the most common use of the room, I would add acoustic panels (absorbers) and bass eaters if needed

Then my small rock band could rehearse in there and not wake the baby
Well, as long as the baby wasn't in the next room lol
 
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