CurtPalme.com Home Theater Forum

[AnalogRocks]

http://www.quietsolution.com/html/quietrock.html?gclid=COnbh8-ovooCFQcHQQod0Fd9hQ

Found this while googling. It's quieter drywall.

" it provides acoustic mitigation equivalent to eight layers of standard drywall."

[AnalogRocks]

http://www.quietsolution.com/html/quietrock.html?gclid=COnbh8-ovooCFQcHQQod0Fd9hQ

Found this while googling. It's quieter drywall.

" it provides acoustic mitigation equivalent to eight layers of standard drywall."

[dc_pilgrim]

I believe you get a similar result for less $$ with green glue (which is kinda $$$ too). I QR has several versions, but I think the cheapest starts around $50 a sheet, and some are over $100/sheet.

[Bighitter]

This stuff is very expensive but very good, it basically converts the sound wave energy into thermal energy which dissipates into the walls.

THX is very big on this stuff as on option, will be interesting to see what HAA says about it.

[ecrabb]

There are tons of threads on the A site builder forum about QuietRock, GreenGlue, etc.

With QuietRock, you're talking $50/sheet for a single layer of 1/2" QR - very basic sound isolation and not a lot of mass. Not really good enough for HT applications by itself. It's better than drywall, of course but at nearly 10x the price, it damn well better be!!!

For about the same money (assuming you're doing the work yourself), you could install two layers of 1/2" or even two layers of 5/8" standard drywall with two tubes of GreenGlue in-between. In that configuration in an HT application, and given that most of us have a limited budget, I think the double-drywall GreenGlue assembly would perform much better for the money.

If you're doing the work yourself, for about half the price of a single sheet of QR510, you could do two layers of 1/2" gyp with a single tube of GreenGlue. More labor, but better performance - for half the price.

Because of my limited budget, I'm doing Integrity Gasket on the framing, two layers of 1/2" gyp all over my room with one tube of GG to each sheet. One tube of GG per sheet is the minimum recommended coverage, so it'll give me a very basic level of isolation.

I'm not expecting to play movies at reference levels at midnight so I shouldn't be disappointed with performance. I just want to be able to watch movies at a reasonable level after the kids are in bed and not have to "ride" the volume. If I can do that, I'll be thrilled.

SC

[Bighitter]

I didn't say I had the stuff, I have 1/2" with a second layer of 5/8" on the walls of my theater that are not concrete backed. It works well, and green glue is really a great product especially for the price.

When I was in the THX tech level I course last year we talked about various products and green glue was actually highly recommended.

[ecrabb]

Sorry, when I said, "you", I meant "a guy could...", not YOU could...



SC

[AnalogRocks]

[AnalogRocks]

[Bighitter]

THX does push digitals these days but then again so do I when I am working. For most people the size is the problem, then again the Sim2 HT5000 or whatever its model is just as big as 1270, 3chip 1080p and it is beautiful and pretty close to CRT. It is also something like 45K.

ISF is in 2 weeks.

[Person99]

[ecrabb]

You're right, Dave... bass is the problem. The only thing that will stop it is mass and/or decoupling. I don't have the money or the room or the patience to do complete decoupling, so I'm doing the next best thing... a little mass and some damping. Even if I had to crank the subs down a little to watch late at night, I'll be OK with that.

Right now, with no sound isolation in the room right next to my little girl, I can't even watch the damn TV with the built-in speakers because if I turn it up enough that I can understand the quiet parts, then the loud parts are too loud and I'm worried about waking her up. What I'm hoping is that with the basic level of isolation and insulation that I'll have, that I'll be able to just set a reasonable level and have full intelligibility during quiet scenes and not worry about waking the kid (soon to be kidS) during the louder scenes. If I can do that, I'll be happy - even if I have to lower the bass level a bit. I'm even thinking about trying to some buttkickers to make up for loss of bass during night-time "kid-in-bed" viewing sessions.

I was telling my buddy that's helping me build my theater about the sheer amount of drywall I'm using, though and it really surprised both of us. I'm figuring about 27 sheets for each layer. That means, I'll be putting 1500 pounds of drywall in there - for EACH layer. The ceiling alone is about 1000 pounds! One 13' wide x 8' tall wall at the back that backs an open stairwell to the upstairs will have 378 pounds on it - I'm thinking of doing two 5/8" layers on just that wall to push mass up in the 475 lb. ballpark. Bottom line is that while I'm taking a cheaper, easier and less effective path to isolation, there will definitely be some mass... plus, I'll get damping from both the GreenGlue and the Integrity Gasket.

I'll certainly let you know how well it worked out.

SC

[GEBrown]

Guys,

Some A/V receivers have a setting to reduce dynamic range - have any of you tried that? Is it effective?

The Toshiba HD-DVD players also have such a setting, but I have yet to try it with mine.

Just an idea

[ecrabb]

[mack1]

Why not try a product called Basotec it's a special foam with a type of rubber on the back and is supposed to be awsome----and around $5.00/sqft

[ronholm]

Don't forget regular old fiberglass installation for the wall and ceiling... that is a big help for little bread..

[ecrabb]

Oh, the fiberglass is an absolute must... but the bang/buck isn't as great as you think. It's not absorptive at all for low-frequency sound - only high frequencies. It's definitely one necessary part of a whole solution, though.

I wouldn't say "little bread", either. My room is only 13x18, and I've probably got in the neighborhood of $250 worth of fiberglass going into it. Compare that to probably $250 for each layer of drywall, $350 for GreenGlue (minimum application), and $125 for Integrity Gasket. Of course, some of that would be necessary regardless of sound control, since my HT has some exterior wall area in it.

Mack, in my quick search, I couldn't find anybody selling Basotect panels or raw material at "retail" - it looked like all OEM type sources. Have you seen it somewhere for sale to end-users?

SC

[ronholm]

In the theater rooms I build for customers . I alway pack the "glass in very tight... you lose the heat insulation properties that way... but it helps with the sound... I have done some of the fancy sound deadening stuff in a couple rooms I built.. Even a automotive type sound deadener in a room per customer request... It was very inexpensive for the sound reduction level.. But I am no expert in this field....

[JustGreg]

Wow...thousands of pounds of dead load on the living floor. You're braver than I am. I don't have to worry about the weight of decoupling layers as my theater is in the basement. I still have to isolate and decouple the ceiling but the walls were isolated during buildout.

I laugh because the biggest problems I have with sound contamination is the low end audio components I have. My sub is SOOO not capable of producing clean low frequencies...very boomy. One thing at a time tho; budget permitting.

Good luck with your project!

Greg

[ecrabb]

I thought about it awhile back, and it concerned me, too. Since I ran the numbers, I'm not worried anymore.

First, I've got 2x12's, 16" OC. Two sheets of 1/2" gyp only contributes about 4 PSF to the dead load... Everything else pushes the total to about 14 PSF. Compared to a 20 PSF dead load and 40 PSF live load ratings, I'm not going to lose much sleep over adding 4 PSF for two layers as opposed to 2 PSF for a single layer.

To put it more simply, even with two layers of 1/2", the drywall on the entire ceiling "only" weighs about 1000 pounds.

I'll post some pics when I get a little further along... cant' wait... I'm FINALLY going to have my home theater after dreaming about it for years.

SC

[Mr. Green]

Less heavy than drywall... NOT for everyday, just when your daughter is asleep. No noise is better than muffled noise.

http://www.laaudiofile.com/amphony.html

http://www.gizmocafe.com/portable-audio/sennheiser-headphones.aspx

Just a thought.

[dc_pilgrim]

Well, my green glue and 2 layers of sheetrock went up today. Not that I'll be able to tell when I get home, I am sure it will just look like one layer. Can't wait to go home.