problem with volume level on icepower 200asc

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I recently bought an "arcustic reality" 202 ref power amp. Its basicly a case with a 2x icepower 200asc modules inside. Sadly i have one problem. I plays to loud. So I tried to put a resistor between the rca-input and ground. this helped by now the amp starts humming when i connect rca inputs.

I later found out that this module i born with a differential input (balanced input) which can be single ended by shorting Vcold and ground (acording to the manual).

Does anybody have the same kind of problems with their icepower modules?
Im also wondering howcome the modules plays so load? I cant see any modifications, so i believe that they are normal unmodified 200asc module.
 
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