subs and small room

Duke offers a lot of "sound" advice. 2 subs are almost minimum, but you can sometimes get away with one sub depending on where it's crossed over and the use of a good parametric EQ. Quite often in small rooms the crossover point may be as low as 35 Hz, which may be lower than the first 1/2 wavelength of any axial mode (roughly 17 feet). Thus you really aren't exciting any of the modes in that application.

We used a Talon Thunderbird and Rives sub-PARC at RMAF and won an Audio Oasis award. This was nearly the case in that we did not really need the parametrics in the sub-PARC because we crossed over so low.

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.