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check you have got a good earth on the amps and also make sure that the power cables to the amps runs down the side of the car but the phono leads run down the centre. failing that you may need what is called a supressor on the live wire going to your amps.
Got the same problem through my sub. Earth is good, everything is tight (Tried several earthing points with the same outcome, ie. isofix bar, seatbelt bot, rear headlight earth). Been suggested it could be alternator whine?
Any reason why you asked about a Pioneer headunit? Curious as thats what I have