Apparently it is a quasi comp version. They used MJ15024's as drivers and 21194's for outputs. I had to learn the hard way to use the RCA 410's for drivers on quasi comps. If the tech looked close he'd likely find the amp is oscillating. No mention of doing load share test, current limit, frequency response, offset, THD, ripple on DC caps. Stock series II displays almost always have open coupling caps. Same for C111 on the driver board that causes poor low frequency response.