Why does my system now have shrill top end.

Al,

Is it possible the P5 is the problem? Not because he plugged the amp into the P5. I doubt is any Pass amp would liked being plugged into a power conditioner.

When the OP is using the P5 for the front equipment could the P5, because of some  internal problem, be causing the sound problem?

I didn't read any OP responses where he tried removing the P5 from the chain. I would try that. Even so far as unplugging the P5 from the AC mains outlet.

@proacman,

When the kitchen was remodeled did the electrician add any new circuits from the electrical panel to the kitchen? If yes he might have moved existing branch circuit wiring around inside the electrical panel, just physically moving wires with his hands when installing the new branch circuit wiring inside the electrical panel enclosure. Just the side to side moving of solid core branch circuit conductors around inside of an electrical panel can change the wire to branch circuit breaker terminal tightness connection. 

proacman OP21 posts11-28-2017 8:15am

Unfortunately the problem is getting stranger. When I turn off all the kitchen lights and play a few songs that are very harsh and then turn them back on their is no difference. But, I plugged the Pass amp into the P5 instead of directly into the Wall and all the Bass was sucked out, as if the speakers were out of phase (they are not). Now this certainly makes no sense. Makes me wonder if the Amp is the issue. Have a five channel amp in my surround system that I will switch with the Pass to see if there is any difference in the harshness (and now bass).

@proacman,

Please, please, please, do try the other amp before kosst amojan has a total meltdown and kicks the dog.

.

Kosst, I assume that I was not included among those to whom your last comment was addressed, even though it mentioned cables.  But to further clarify my comment about the OCOS cable (and Peter, thanks for the second): As you may be aware there are a few speaker cables which have ultra-high capacitance, such as Goertz and the old Polk Cobra cables. When used without a Zobel network, and especially when used with solid state amplifiers, those have been known to cause ringing and/or oscillations, and in some cases oscillations which have even resulted in severe damage to the amplifier.

After doing some research I have not been able to find an indication of the capacitance per unit length of OCOS, but it is an unconventional coaxial design having an extremely low "characteristic impedance" of about 8 ohms. That suggests a strong possibility that its capacitance is very high.

On the other hand, I would expect that the not especially extended 100 kHz bandwidth of the amp, and the relatively modest amount of feedback I believe it uses, lessen its susceptibility to that kind of effect. But it should be easy enough to rule this possibility in or out, perhaps even by using Home Depot or Radio Shack wire for purposes of the experiment, if the OP doesn’t have any other cables of suitable length on hand.

Your suggestions about the amp are of course also good ones, IMO.

Regards,
-- Al

@almarg,

+ 1


Jim

Moderators please remove all the insulting posts, perhaps kosst_amojan himself, from this site. He continuously insults and brings down the enjoyment and civility of this once fine audiogon community. This cannot continue without many of the long time and civil members opting out of these forums.