Sealing ported enclosure to reduce boom

I had a serious boom problem that was practically eliminated by repositioning the speakers. Sometimes, the problem is the room.
Try the following experiment: if your room dimensions are x by y, put the speakers at 1/4 x and 1/4 y from the respective walls. You might not like what they sound like there--they may sound a bit thinner than what you are used to--but what you are after here is to see if the boom goes away.
If it does, then your primary source of boom is probably room-related. It's a pain in the posterior to deal with, but the laws of physics are not mere suggestions...

Go to the Cardas site and use their room placement guide. Helped my speakers and cost nothing except the effort to move the speakers.

Great responses. Actually I stuffed the ports then I took out the woofer to see what was in the cabinet and the woofer is completely sectioned-off with pieces of foam! So I have to find out where the port is getting its bass from: I have to remove the other drivers.

Try moving them out away from the wall a few inches at a time....it should help a lot.

Dave

>08-24-10: Ifsixwasnin9
Great responses. Actually I stuffed the ports then I took out the woofer to see what was in the cabinet and the woofer is completely sectioned-off with pieces of foam! So I have to find out where the port is getting its bass from: I have to remove the other drivers.

Low frequency waves will go right through the foam. High frequency waves won't. So driver output in the port's pass-band excites its resonance, but higher frequencies off the backside of the driver (which are obviously 180 degrees out of phase with what's coming off the front side) don't escape from the port.