I have noticed in some movies and concert DVDs that there was this annoying high-bass tone that was audible from certain spots in my room. I'd say it sounded like it was in the 150-200hz region. I thought my subwoofer was giving off some weird reflections from the room.

It turns out this noise is coming from my wall-mounted Polk Monitor 30s. They are rear-ported, and the ports are each about an ince or so off of the wall. I discovered that this noise is in fact some sort of "boom" coming off of the close proximity to the wall. Taking the satellites off of the wall eliminated this completely.

I was wondering if i should buy a couple small squares of acoustic damping material to put on the wall right behind the ports of the speakers to get rid of this annoying high-bass spike.

Other than that, things are sounding good

Thanks for any help.