Pioneer Class FD 4-Channel Bridgeable Amplifier w/1,200 Watts Max Power, Model GM-D8604
I am soo happy with this amplifier.  Compared to my stock stereo with the mediocre 22W RMS 2ohm speakers, this amplifier powers my 75W RMS 4ohm speakers with ease.  Running it according to manufacturer recommendations with a 4 gauge power cable.  Sound is clean and no issues on my system.  And I did a DIY install.  I didn't have to adjust any switches or pots on this device as everything was set to go out of the box. Just hook it up and go.  I wonder how much better it will get if I actually tuned the amp.<