Ultrasonic Oscillation

Hi Atmasphere, thank you for your response. I appreciate it very much. And a consideration that I had not considered. I have used my GMA Europas(4 ohm/88db/7-120W @ 8 ohm amp)for years with both an Odyssey Stratos amp at 150W @ 8 ohm and a Denon POA 1500 at 150W @ 4 ohm. I don't play my sytem at loud volumes. The GMA's are known as an easy load and are known to be driven with low power amps from what I have read here over the years. That really is what is vexing, until this year system played fine. Even the Snell's that are a more difficult load are pushed by tube systems of a lesser power then the amps above from what I have read also. This weekend I'll be taking the system to my daughter's house to see if the problem persists there no matter how dumb that may sound. No stone unturned. Again, thanks much. Dave

One other thing to look at is corrosion on the ground contacts of your RCA connectors. That can toast tweeters too.

Not sure why I read this old thread but I did. A very interesting read, and now I'm curious as to how the situation resolved. ???

Yeah, we ought to have an unsolved mysteries category, it would be interested to see what the outcome turned out to be. I liked the one with the system hum that baffled the OP for quite a while and was finally traced/linked to the dc cabinet lights in the kitchen being on.

Hello all, I was going through some threads discussing palladium and came across an old thread of mine. So Timru here's the rest of the story and no it wasn't the kitchen lights although I only wish. As part of my desperation and frustration I dragged all of my equipment to Music Technology and Bill Thalman's gave it all a clean bill of health. I called him back to discuss and he came to my house to listen and said the high freqs were performing as they should. So now what to do, listen to my wife who said the problem had to be me. Many times. I had my hearing checked and now with hearing aids music is beautiful. I now consider the ear horns as one more critical piece of equipment in my system. Am I hearing what others may hear, most likely not but in my limited ranges a great joy.
And that's the rest of the story. Regards, Dave