I just upgraded from an entry lever HT system, so my expertise with all this is pretty limited. I bought a sound system with Polk RTi70s (L/R front), Polk CSi40 (center), RTi38 (L/R surround) with a Onkyo 600 receiver for a 14'x14' room that opens to several other rooms (center of apartment). I bought a Velodyne 12" for this system, but now I'm wondering if I over did things with the subwoofer. When I turn it up only about 20% - 25%, it starts to overwhelm the other speakers and the room. I have to keep it below that level most of the time. Is there any drawback to returning it and getting the 10" sub? Will I loose some defination of sound with the smaller sub? Any suggestions would be appreciated.