Why does my system now have shrill top end.

I am still surprised the OP has not at least tried swapping speaker cables with how cheap, quick and easy it would be to do.......

OP last commented saying he was going to swap the amp this weekend and if not that then look at ac.
This weekend could well be late tonight, we do not know his work schedule.
However if not the amp, I certainly hope he does not jump straight to ac possibilities without at least swapping speaker cables no matter how unlikely that scenario may be. Its cheap, quick and easy.
I am thinking the amp swap will reveal plenty but we just have to wait for now.

Thank you
Kevin

@whitestix
You could not actually be any further from the truth my friend....lol.
I am married so used to being insulted by a professional on a hourly basis!
I just do not wish to see these forums degenerate any further
Everybody is entitled to their own opinions of course

@geoffkait
yet another productive post I see, thank you so much for that.

And yes agreed, we need to lighten up for sure

But I digress, lets leave this idle banter behind and keep on the subject, no further off topic posts from myself...tonight.....

@whitestix 

Its not really about awful thin skin.
Its about common courtesy and civility.
In this instance Kosst could well be right for sure but there are ways and then there are WAYS of getting your point of view across.

These forums are based on freedom of speech and opinion bearing in mind the constraints of decency and civility.
Once a member puts forth a view that differs from yours you do NOT spit your dummy out and go on a verbal rampage!
That is the stuff of Farcebook and has no place here at all.

Here's hoping the OP enlightens us on some findings.

There is a possibility of a blown fuse inside the amp?
My BAT has 2 fuses per rail and has an annoying propensity for blowing the front fuse on the lh channel rail.
When this happens I can measure over 5vdc at the output terminals. No I do not know why it does this, neither does bat.
Could be a possibility that would preclude and expensive trip to a dealer.

If Kosst reference to DMM means digital multi meter it is possible the op does not have a halfway decent one or even know exactly what he should be testing/looking for. If the latter is the case I do hope he will ask for help right here because that is an extremely valid test as well.

@toddverrone

I would agree the cables or the interconnects are unlikely culprits but as it is a very simple and cheap test it should not be ignored.It is possible it really was not sudden, a connection may have been corroding or degrading for a while but then reached a point where it had gone that far as to now present itself as an audible artifact at last.Unlikely true but not impossible and one that should not be ignored in the greater scheme of things.

To the OP
Did you try replacing the speaker cables yet? Anything will do for a cheap dirty test, zip cord, bell wire even regular SO cord ( no you do not have to use all 3 conductors LoL!).

I may have missed this but did this start at the same time as the kitchen refurb grand opening ceremony? If not then even though all the potential kitchen issues may not be helping overall SQ I doubt that it is the cause of this particular gremlin.
I am thinking most likely cause (after eliminating speaker cables and checking all interconnect integrity) would be the Pass or the P5 but most likely the Pass.
Hoping it is not as yes it is a royal pain and cost to pack up and ship back to Pass for a checkup.

On another note entirely (sic)
Why oh why do we feel the need for openly hostile, rude, antagonistic and generally arrogant posts? Oh and then the additional purely inane ones to boot that serve no usefull purpose whatsoever.
Everybody is a keyboard warrior nowadays........