Let me start by saying that I am an avid fan of not neccasarily "Vintage" audio equipment, but pristine, older stuff., as newer, affordable, solid state Sony and the like is just not "good" sound to me. I purchased a Harmon Kardon 6650 Integrated amplifer new around 96'? and it provided me with years of perfect service until the L channel on the amp section went south a year and a half ago. I preferred the sound of the HK so I opted to switch it out of "integrated" and into "seperate" and use the preamp section to drive a Carver TFM-15 I picked up reasonable off ebay. About 6 months after using the Carver, my system developed a series of "Pops" through the speakers (Both) and sometimes (pushing the speakers "out" and holding them there for a moment) upon turn on... for about a min or so then it would be fine. This issue got progressively worse, so I tried changing the HK Preamp for a Carver CT-3 which helped for a short time then did the same thing until it got so bad it was causing the amp to start "clicking" in series with the "Pops" and got to the point where I actually saw "lightning, for lack of a better desciption" from inside the amp. At this point I had to assume the amp was bad and replaced the amp with a Harmon Kardon PA2000 (This is an isolated amp with 45x4 or 90x2 bridged, I set it to the bridged mode, hooked it up to the Carver Ct-3 Pre and the speakers and life was good for a day! Now it's doing the same thing... I'm at a loss guys. I am using this system off my PC and used desktop speakers with no problem while I waited for the HK PA2000 to arrive. My logic tells me I have extremely bad luck with amps (I NEVER abuse them) or a problem "short?" with the speakers (Floorstanding Mirage Omni550s") But if it was the speakers, wouldn't only one side (the bad side) misbehave? they both pop the same. Unless they both mysteriously have the exact same problem... ANY suggestions or thoughts would be appriciated!