Pdx 4.100 problem need help

[BukvaMan 10+ year member]

I connected the ground power and remote to the amp and everything seems to work fine. I left rca out for now to see if everything is ok with the noise level of the amp. Connected the front speakers everything fine connected the rear speakers i get a high pitched constant sound coming out of the speaker.

Now trying everything i could i discoverd that when i have 3 speakers connected i didnt get any noise and it doesnt matter which position i connect them or wich one of the speaker wires. As long as i have three connected no noise put the fourth one in, noise!!

I tryed regrounding, jumping the remote directly off the feed and still the same high pitched sound that doesnt increase or decrease just a constant noise.

is my Amplifier bad what can it be im really out of ideas.

i really need some help on this one.

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[enginerd 10+ year member]

Ever find the solution? Mine is doing the same thing!

Josh