Green Glue on the floor?

[jmgonza6]

I live in an upstairs condo and need some pretty decent sound proofing for the floor and one of the walls. First my setup: I have Energy Connesouir series fronts center and rears. The fronts and center are run through outlaw audio M2200's and the rears are going through my Onkyo sr706 AVR. I also have an SVS CS-Ultra being run through a Berringer EP2500 . So I have one adjacent wall that connects me to the other lady, what a sour person. My house burned down a year ago and insurance is just getting around to rebuilding. So I now have the ability to design this house the way I want it, already pre wired for inwall HDMI & speaker wires. On that one adjacent wall I have already gotten some green glue on the way to take care of that problem. My next hurdle is a concrete subfloor onto which I am laying 1/2" wood flooring, with a 1/8" acoustical barrier. My question is I really should green glue the floor especially where my sub will be. So my question is what should I apply the green glue to? the sub floor and padding or wood floor and padding? Thanks. I will be tackling this project in about a week so thanks in advance. Cheers

Joe

 

[Ted White]

Hi Joe,

Really no place to use GG in the floor as described. You need rigid panels to make the GG sandwich. The floor you're installing will be floated on the membrane, so no way to compress the GG.

The biggest contributor of vibration will be airborne sound from speakers, not vibration from the cabinet. Having said that, you would be better to try and decouple with spikes, or build a short, squat base under the subs (or speakers in general).

Ted

 

[jmgonza6]

Great. Thanks for letting me know before I wasted my GG. Luckily I have spikes that came with my speakers, as far as a squat base for the sub what do you mean? Should I take a piece of wood about 2" thick and put some feet on it? Its pretty heavy, 110lbs, so I feel like putting spikes on that might damage my wood floors. Thanks man.

Joe

 

[jaxvon]

Hi Joe,

Really no place to use GG in the floor as described. You need rigid panels to make the GG sandwich. The floor you're installing will be floated on the membrane, so no way to compress the GG.

The biggest contributor of vibration will be airborne sound from speakers, not vibration from the cabinet. Having said that, you would be better to try and decouple with spikes, or build a short, squat base under the subs (or speakers in general).

Ted

You're partially correct. Green glue is designed to be used between two pieces of drywall or plywood to create a constrained layer. This makes the sandwich effective at deadening sound because it converts it to heat. If you (the OP) are concerned about sound leaking through the concrete subfloor, then think about making a green glue sandwich with your plywood flooring, otherwise skip it. Generally, green glue is used for walls to help deaden sound. When used with high density fiberglass or mineral wool fill in the wall cavities, it is pretty effective at isolating sound.

Of course, for maximum efficacy of sound isolation efforts, you need to stop air leaks to places you don't want sound traveling and physically decouple your speakers and subwoofer(s) from the structure. Speaker spikes do NOT decouple things, but rather create a more effective coupling action. An Auralex GRAMMA pad or a DIY version would be the preferable option to spikes. A "squat bass" will do little to isolate the device placed atop.

 

[bpape]

You might want to take a look at Ted's profile. He is one of the primaries in the company that makes Green Glue.

Bryan