Question for those w/ a sub/sat system

[Finch Platte]

Last night, on a whim, I bought a powered subwoofer to replace the smaller, unpowered subwoofer in my Boston system.

I hooked it up, and it shakes the room, but it sounds as though there's something missing, like a few frequencies? Lots of bass, plenty of mids & highs, but it sounds like some lower mids might be missing. Is this just something I need to get used to (wow, bass!), do you think, or are my ears trying to tell me something? (Your system sounds like crap, now!)

There are adjustments on the sub for bass volume and a knob for cut off freq., but I'm bouncing up & down off the couch twisting the knob every 20 seconds.

Any help, suggestions, ideas, beer would be appreciated. I'm beginning to be sorry I moved my living room around now. The system sounded fine before, and now every place in the room sounds different. The sweet spot on the couch sounds great sometimes, but when I get up and walk around, the bass gets overwhelming. Help!

fp