Hard to say what the problem might be; you will need to do some troubleshooting. First thing I would do is to download the wiring diagram which has the sound system.
I don't remember if each speaker is a separate output from the Q box or if some are parallel wired. All will be revealed when you look at the wiring diagram. How they are wired will determine your trouble shooting. If the 'bad' speakers are in parallel with some that work, then I would suspect a bad speaker. If the problem speaker(s) is direct wired from the Q box, then I would attach a test speaker at the Q box output.
All of the speaker wiring leads (and R/L input) to the Q box - mine is in the front left basement compartment.
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--John
2005 Horizon 40AD, 2005 Jeep Liberty CRD
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