SURE AB32186V220

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Hi guys!
A friend of mine has given to me a Class D Amp, Sure AA-AB32186V220,
TC2000 + STA508.

https://drive.google.com/file/d/0B_FZwXIolGIWSUFnbFFSSHF6aVVwa0pPSnVJMGpHdjNDLV9Z/view?usp=sharing

I have tried to use it in my car to amplify the twitter signal, but it creates a bad GND loop sending noise to the speakers and disturbing the other two amplifiers.

I searched the forum but i found some tricks only for orther boards.
Is there some improvement that I can do for my amp?
Is there a resistor to eliminate in order to separete the RCA GND from the alimentation?

Thank you really much!
Coulthet
 
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