Why does my system now have shrill top end.
@almarg I would be genuinely shocked to discover a Pass XA30.8 exhibiting ringing. Nelson believes in wide bandwidth but also takes great care to avoid ringing in his amps. He once built an amp at Threshold that became unstable into cables such as we're describing and it released the magic smoke. Since then he's made it a point to avoid designs with that possibility. The F5 is an exception to that where he specifically warns against exotic cables that are good at transmitting high frequencies, like Litz wire, because of the DC-1MHz bandwidth of the amp. I suppose it's technically possible something could fail to allow that, but I think we'd be talking about a short or a resistor failing closed and that would lead to far more drama than a shrill top end. |
Al, I agree the speaker cables should be replaced with something else to conduct a test. The most the OP will be out is a few bucks and a little of his time. The OP can pick up something cheap speaker cable at Best Buy or Home Depot. Al, What are the chances the OP could connect the Linn Linto Phono Preamp directly to the inputs of the Pass amp without it playing too loud for a test. That would take the Pass XP 20 out of the equation. https://www.audaud.com/audaud/JUL-AUG02/EQUIP/equip2JUL02.html Unplug the Pass XP 20 from the power outlet. Try the Linn Linto Phono Preamp first plugged into the P5. If the " shill" sound is still present plug the phono preamp directly into the wall outlet. Unplug the P5 from the wall outlet. Jim |
