inputs.text: updated review 042316 review would want read entry lvl audiophile - installed hour two ago good strong clean power no whine static channels powering rockford fosgate punch 65 components front polk cannot rehemehember random polks 50rms handling placeholders upgrade hertz sound crystal clear powerful polk 660475rmsx4 died days ago expensive puts less power first class speaker amplifier cannot tell difference class ab myths polk ab maybe better quality amp sounds much better polk well alpine m300 car alpine put 50 rmsx4 much easier dial gain wise match head units 5 volt preamp voltage pioneer 80prs head unit polk well amps looked comparison soundstream picasso series soundstream tarantula mb quartz rockford fosgate prime 600d punchpower series glad went amp hoping not end one channel dying issue hadupdate 042316as date past 23 months front left channel cutting drive make turns speaker tweeter cut continuously took apart door tweeter connections sound unfortunately going bite bullet buy 300 amp puts 100rmsspeaker frustrating everything give long no abuse