Sorry, don't get involved in engineering design specs. Only get involved if factory or authorized GM dealer installed accessories don't operate correctly.
However, I agree with h3'er, something does not sound like it is hooked up correctly from the Sirius receiver, or there is an impedance issue between the two items.
I'm assuming the Sirius feeds the head unit, which in turn feeds the Monsoon amp, as it does for a factory setup?
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