The Alpine system on my wifes durango was lacking on the bass end, after research it appears they dedicate 100 watts to each of a dvc 8 inch sub. After realizing the papercone sub is of good quality I removed one channel after stuffing the enclosure, before deciding an additonal amp is required I decided to try a 12 inch 2ohm sub,the Alpine dvc is 2- 2ohm,using this sub channel,the bass was better but not loud enough to drop the eq to 0 to get rid of muddy bass from front 6x9s since I install car stereo, not much in my last years I had a 10x3 Sony subs in a q logic box, much to my surprise the1.6 ohm load was noticeably better, Alpine rolls the bass to the factory sub very low,60-80hz,but 100 watts is available,3 sony subs at 90db x3,is very efficent, and the weak spot is the oem sub, and enclosure,it still contributes but nothing deep,hope this info helps others my first post here, quite happy now the amp can be accessed through the rear bucket tray pulling it out you can see and feel it, must be class d as it never gets that warm,the output levels are to low on many cds.I have loaded this channel to 1 ohm with a 2omx2 10 inch,this played well also,but mutiple drivers,give better efficiencyJMO-Phil