Quote:
Originally Posted by jonywalker
Then it is the noise of its own. Normally such aftermarket amps have S/N rate higher than 90dB, even my PDX with 76dB doesn't have any noise if input is disconnected. Above 90dB should be noisefree absolutely. I assume your car engine was off during the test otherwise the electric magnetic interruption could also be a possible noise origin.
So you could send back you amp.
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is that volume independent? because the music is quite loud when i plugged back the inputs at the borderline of hiss/no hiss