Front Door Speakers - No Mid Range/Treble (Aftermarket)

[AK Bob]

I have the 8.4 Uconnect/9 speaker Alpine.

I know it has an amplifier above the pedals under the dash.

I wondered if an amplifier can lose just the front channels or something along those lines.

I have no idea what the problem could be otherwise at this point.

I have troubleshooted the head unit and speakers.

They are not the issue.

I'm unsure how to test the wiring for bad ground somewhere, but it's all the factory wiring harness, so I am unsure how that could be a problem.

I recommend directly checking for audio output with a known good speaker at the amplifier.

Attached is the electrical diagram for my 2014 Premium Audio System; hopefully, yours is the same.

The two front door speakers come from the amplifier C2 connector on the driver-side dash.

See attached diagram and amplifier location.

I would disconnect the C2 connector and hook the speaker to the amplifier side to eliminate a possible grounded, shorted, or open wire on the harness side.

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