Ultrasonic Oscillation

Italian

Anything you connect to the speaker output could potentially create an unstable situation, if the capacitance of the wiring is too high.

But this is very unlikely with a sub unless you are using exotic cables.

Did you upgrade interconnects prior to burning out your HF drivers?

SEVERE clipping can do this, but it would be so loud and unpleasant I doubt if you would not notice it.

Unplugging a connection to an amp or preamp with the volume up (that results in a burst of noise) can do this. But since you have destroyed TWO sets of drivers, this is unlikely.

Yes, i did switch to a set of DH Labs special edition ICs from pre to amp. Thin wires. Have a set of MAC palladium ICs from CDP to Pre but had been using them a while. Dave

Hi, thought I'd follow up on this thread. I took suggestions to have my equipment bench tested, both sets of speakers as well as pre and power amp checked out OK. Set everything up, and now five months later HF still dead. Again and again yet I swapped all equip and wires. Problem still exists. I have been told it's not likely but can it be in my house wiring? I have also ran power to other outlet elsewhere in the house via heavy duty extension cord and same problem. Any suggestions, what can I possibly be missing? Yeah, I'm totally frustrated and at a loss. Thanks much, Dave

Italian, It sounds to me like your amplifier has too little power and you are pushing it too hard. That is why tweeters fail! Its not because of a malfunction.

So you either need a more powerful amplifier or more efficient speakers.

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