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<blockquote data-quote="Lasherž" data-source="post: 8707817" data-attributes="member: 679555">A lot of aftermarket units have a separate ground anyways, so there&#039;s nothing wrong with splicing and using a terminal to ground it against the frame too. It&#039;s at least something to try. Usually noise like that is either a ground or signal issue. I&#039;m curious if the sound goes away or gets less severe when the car is off? Usually that means it&#039;s a power interference issue to low signal inputs (which you don&#039;t have if you&#039;re using high output direct to the amp) so make sure the amplifier isn&#039;t very close to a coiled power cable. An alternative thing is active ANC unit running to the speakers getting amplified.An important diagnostic step would be to get a 3.5mm to RCA adapter and see if your amplifier makes the hum without your car&#039;s head unit included in the mix. It won&#039;t address all internal amp issues because it&#039;s not high level input, but it will at least verify that the amplifier is capable of running without the hum or if there&#039;s a strong EMF near the amp.</blockquote>

[QUOTE="Lasherž, post: 8707817, member: 679555"] A lot of aftermarket units have a separate ground anyways, so there's nothing wrong with splicing and using a terminal to ground it against the frame too. It's at least something to try. Usually noise like that is either a ground or signal issue. I'm curious if the sound goes away or gets less severe when the car is off? Usually that means it's a power interference issue to low signal inputs (which you don't have if you're using high output direct to the amp) so make sure the amplifier isn't very close to a coiled power cable. An alternative thing is active ANC unit running to the speakers getting amplified. An important diagnostic step would be to get a 3.5mm to RCA adapter and see if your amplifier makes the hum without your car's head unit included in the mix. It won't address all internal amp issues because it's not high level input, but it will at least verify that the amplifier is capable of running without the hum or if there's a strong EMF near the amp. [/QUOTE]

Verification