bass suggestions 12 x 16 room....

Check out these Epiks, VERY nice subwoofs for not much money...

http://www.epiksubwoofers.com/legend.html

-RW-

Have you ever taken room measurements to see where the problem frequencies are occuring?

For starters keep speakers out of the corners, and away from the back wall- these positions tend to reinforce bass, especially if the speakers have rear-firing ports. I have a similar sized room (11x13) speakers on the long wall. Speakers are just over 5 feet apart and 18 inches from the back wall, toe-in is one inch making them 19" away from the back wall on the outer corner. Listening position is about 6 1/2 feet back from the leading edge of the baffles. My speakers are pretty wide so yours may need to be further apart if they're tower type speakers. Placement can make mediocre speakers sound better than you'd think, and great speakers poorly placed will sound terrible. Experiment-I put blue masking tape on the floor when I find a placement I like so If I make a change it can be reversed if it isn't an improvement.

Hopefully, through positioning, you can reduce the problem to a narrow range of bass frequencies (ie. 50Hz-->60Hz) If it still bothers you, it might be necessary to change out the speakers for ones that roll off below about 60 Hz or use a parametric equalizer or low pass filter.

You may need a sound level meter, a tripod and some test tones (on a CD or otherwise) to fix these issues.