@bigtex22 My room size is 13ft X 18ft. I bought 2 JL212 subwoofers to compliment my Kharma Exquisite 1E Signature. The subwoofers are very important as they provide the foundation for full bodied to the music especially jazz and rock. I recently bought 2 Funk Audio LX21.0 which greatly improved the emotions to the music. The software for tuning the DSP of the Funk subs is very user friendly and easy to setup. I recommend you to go for the Funk LX18.0 or the Lx21.0.
Happy listening.