Tried the Audiobytes amd and my old Yahama. They both yield a horrible hum... Tried my old very bad sub and it does the same thing with receiver. Sounds like the pre-out sub is blown. Yesterday I had tried two channels and they were fine. I guess I better check them all again!

Is it okay to use the pre-outs and feed them to the audiobytes? Because of size, it is a lot more mobile!

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