subs and small room

Lot's of good advice above (I am now inspired to add a second sub!). To relay a little personal experience, for the past couple of years I had ported monitor speakers in my 11'x 22' room. I have my setup on a short wall, which effectively requires that I use a near-field approach. I wrestled with excessive bass "boom" for some time, but after some experimentation I noticed that I could plug the ports on the monitors and control the bass very effectively. Based upon this experience, I have recently decided to go with a sealed monitor (Merlin TSM) and added a Martin Logan Dynamo (10") sealed sub. Like Timrhu, I found the corner didn't work well and I have my sub positioned just as he does in his system pics (sorry my pics are not up to date). I get great bass response with no boom - except occasionally on poorly recorded material. So, the moral of my story, you can get good bass in a small room, but I would highly recommend sealed enclosures both for the speakers and sub. Also, experiment a lot with your crossover and volume levels (get an spl meter) and fight the temptation to turn the volume levels up. The goal, I believe, is not to hear the sub per se, but rather to miss it when you turn it off.

11 x 22--ouch. This is as bad as my office, which is 10 x 20. However, it works good for testing worst case scenarios. You will need something with a parametric and depending on the crossover point 2 subs can make a significant difference for both the peaks and nulls in your case.

Why I like a bass horn with its one massive null. Easy to work arround this sit 8-10ft from bass horn;) But dukes got a point.Under his hat;) And is right about the swarm of subs...

I suggest bass traps at the very least. You'll never achieve acceptable response without room treatment. As Rives said, a parametric EQ is also recommended but I would start with good quality bass traps, at least in the 4 corners of the room, add more later for even better results.

If things are getting too exciting, try a few Vallium. that should work.

Add in a few more and setup will get pretty interesting too.