I've owned some nice receivers before but this purchase several years ago was my very FIRST Harmon Kardon... I'm sorry to say that I was very disappointed. The brand speaks for itself in terms of quality but obviously from my experience and a multitude of others across the web this model was a bad apple. I kept this amp in a room where it was used only occasionally rather than daily. Just over a year after purchasing it brand new it began to deteriorate... first intermittent and obnoxious "popping" and "hum", overheating (in a cool room), then finally the right channel went out. I paid a good deal of money for this amp. The experience has left me with a bad taste for HK so I will be hard pressed to risk another investment on the brand again. I've since purchased an Onkyo and a Denon. So far I'm very pleased with both.