I am using the (4) JL F-113 subs because they have an in-room microphone calibration set up. Each sub has been calibrated based on its room placement to my sitting position. I find the corners to be the best in overall deep bass response.
My main speakers go pretty low by themselves, so I have the subs set at 40-45hz. and are at a low volume level to add something that the main speakers may not have.
ozzy

