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The easiest way to see if the HU is at fault is to switch the wires. Place the left channel on your right speakers. If the problem follows, then the HU is at fault. If it stays on the same speakers then a wire, filter or speakers are at fault. When you wire up the HU, is the negative wire shared by more than one channel? If so, rewire it. You may have a poor connection. Otherwise, you will probably be better off sending the HU in for repair. If the problem is not related to the HU, then ask for specific help on your car make, year, and stereo from the forum. There are plenty of individuals that know the electrical wiring and if filters would be used.
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