This is a great sounding amp. I have it installed in a real 3-way system driving a pair of Dayton 4 ohm 12's in a sealed enclosure. Bass is thundering and the amp drive is turned down at the Rockford Fosgate 3Sixty.3 controller. It runs along with two Alpine MRP-F300's that handle mids and highs. Bass is tight and clean in this SQ build. No noise from ignition or alternator and it pounds away with no heat issues. Very pleased with this amp - the installer at The SoundWorks had good things to say about the PDR-M65 as well.