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I installed Polk RC 85i's in the wall of my townhouse, and didn't realize how much the neighbors were going to hear the woofer through the wall even at moderate decibel levels.There's about 1 or 2 inches of space from the back of the magnet to the firewall that is separating the townhomes. I've heard there are foams, and specific materials out there that will deflect that bass sound. Where and what are they?
Sure hope I don't have to pull the speakers out and patch the walls....
Follow Ups:
The space in the wall is acting as a box here, and the sound pressurte inside a normal loudspeaker box is typically 30-50 dB higher than in the room. Probably the volume inside the wall is slightly larger than most loudspeaker boxes which makes the problem slightly less, but still you will be applying in the order of 20 dB more sound pressure to your neighbours wall than what you get in your own room.With this in mind I think you only have three options:
1.Remove the driver and put it in a separate box.
2.Build an airtight box of sufficient volume inside the wall
3.Make the wall behind the driver heavier/more rigid. (not very easy)Damping materials will probably only have a marginal effect.
Svante, thank you for this info. Wow....talk about a learning lesson.Before seeing your message, I had already bought the Dynamat system and put all that rubber and foam behind one of the speakers. It did very little, if anything to solve the problem.
So I'm interested in trying Option #2 you mentioned: An airtight box. What suggestions do you have to make the best box? Also, what % of the problem would you estimate this will solve? I'm not cranking this system by any means. Just movies/TV, and the occasional music listening. Not like there's a party here all the time.
Thanks for your continued advice.
Just the fact that the speakers unit/frame is mounted to the adjoining wall will transmit vibrations to the adjacent structure and no amount of dampening material on your side will deplete that.Make nice with your neighbors...maybe a bottle of wine but other than that, U R stuck with your situation barring removal of the speakers.
Cheers,
~kenster
Ken, thanks. What if I bought/built an enclosure to seal off the back of the in-wall speakers?
While that would lessen the bleedthrough so to speak, as long as U share a common wall with your neighbors, the sound is going to be transmitted thru the structure.Cheers,
~kenster
Dynamat makes some stuff that will work pretty good. I used these on the three front In-Wall speakers of my brothers Home Theater. They made a huge difference in the sound quality. Much tighter and more accurate bass with less vibrations. They go for about 85.00 or 90.00. let me know if you need help getting them. Dynamat also makes some other products that may help. In new construction its easy to put some backboxes in, but with a retrofit your options are limited.
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