Check the Earth for the AMP!
Cadence Amps have silent power switching and shouldn't thump at power-up.
Poor amp earthing can cause the amp to earth through the RCA cables via the head unit and give you a feed back thump.
Although a very high gain may cause it too. How high is the gain on the amp?
Also be sure to use the decks 'remote' lead for switching the amp on and not the 'aerial' lead they are switched differently.
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