Help needed with home system
For the past two years, I have been struggling with a problem in my system that causes the hf drivers to be blown in my KEF Q55.2 loudspeakers. My dealer has been extremely patient through all five (!!) repair cycles, and shortly I will be receiving a brand new pair of 2004-model KEFs to replace the Q55's. Unless I find a problem, I will be selling the KEFs because there is no reason to suspect they will not be damaged similarly.
Some of the things I've done to get around the problem....
- replaced my power strip with a line conditioner (now using Tripp Lite 600W)
- replaced my receiver with separate preamp/amp (Adcom 555-II)
- replaced my cd player (now using Rotel)
- replaced my cables (short matched-length monster cables)
- borrowed an oscilloscope, bought an audio test cd, built a dummy load, and spent a couple weekends trying to get my system to break or display some sort of clipping or distortion.
- hooked up my old Large Advents and a pair of old Technics loudspeakers at volumes approaching insanity, and no problem
- moved the system to different rooms (blew the driver in 3 different locations)
- took my entire system to the dealer, and demonstrated that it could be played at mind-numbing levels without any problems.
- ran the KEFs on my dealer's Mcintosh 400w/ch system, and they perfrmed flawlessly.
It seems to point to an "environmental" problem....but I am out of ideas at this point. I know there are Adcom haters lurking...but I have blown the KEF drivers in 3 setups now...first with an Onkyo AV receiver, then with a Carver receiver, and finally with the Adcoms.
Any ideas or suggestions would be appreciated.