I'm looking to add a subwoofer, or two, to fill out the 20 to 80Hz portion of a stereo system that resides in small 16' x 12' room that has combination of Helmholtz and super chunk bass traps. The chain is music server -> pro-audio interface -> (.80Hz) line level to stereo speakers + -> (<80Hz mono) line level to subwoofers with filters generated via Acourate. I am, most often, the sole listener so I'm hopeful that I can get away with a single subwoofer that is EQ to the one listening position but open to adding a second should this be required and budget available. So, then, my question is how one goes about finding a suitable subwoofer given that home auditions are unavailable and store demos impacted, largely, by position and integration. Most of my functional requirements are met with common brands given that I'll be managing the x/o and EQ off-board but I'm unclear about sound quality. Is this purely a function of comparing output levels and distortion at a nominal output level (see data-bass measurements e112) or is it a case that there are other factors to be taken into account? (A fair number of reviews, for example, seem to hint that for music JL Audio subs perform a level above the top of the line SVS subwoofers which in turn out perform PSA subs .)