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Old 06-19-2017, 02:12 PM   #5
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Chapter/Region: Tri-State
Location: RAMSEY, NJ
2009 IMPREZA 2.5i 4d
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If you hear the hiss with the HU off, the HU is not the source. The noise might be picked up from the harness. Shielding cables or twisting wires might reduce capacitance.

Originally Posted by tsouzee View Post
Once I put the car in accessory I heard an audible hiss in the background. I powered the HU off but the sound was still there coming through the speakers. Not as noticeable with the car on but definitely noticeable with the car in accessory. I had the amp's gain two bars from the minimum. The amp did help the speakers pump real nice, but even at higher volumes I can hear some background white noise that shouldn't be there. It's not terrible but I'm very particular.
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