Hissing in new setup

[ricktcole 10+ year member]

Ok I just built a new amp rack and when I installed the amp for the front speakers I have a hissing sound and now I can hear the amp turn on and off it 's almost like a pop. I added cooling fans and they are run off a relay to a distrubition block as well as the remote wires.I grounded the amp to the same place it was grounded before. does anyone have any ideas what could be causing this?

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