Back in the day I use to have a subwoofer in the car but can of outgrew that stage, the large setting does help but I think the small setting is the appropriate one for calibration. Now for DVD Audio the bass is not to bad and the DVD player controls the settings so the bass knob is disabled, for stero thou I may crank the bass knob up a bit, atlest to my ears it sounds alot better that way, I dont know maybe it has something to do with the receiver signals in stero mode. AS far as wiring the positve and negatives are correct, I use ZU Cable fro the price it better not be the wire
