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The front speakers and rear speakers are all the same ohm rating, right? You don't have 2ohm speakers in the front and 4ohm speakers in the rear, do you?
I ran all new speaker wire and didn't find the front to be louder than the back, but rather the back to be louder than the front. The reason why is the choice of speakers that I made; well, really it was a result of a lack of forethought.
Along with the many measurements that a speaker will list on the box (rms wattage, max wattage, mounting depth, frame size, etc) you will find a measurement called 'sensitivity'. This is a measure of the level of sound output achieve when one watt is given to the speaker. A speaker with a 93db sensitivity will play at 93db given one watt, and a speaker with 89db will play at 89 db given one watt. It may seem like a minute difference, but if you wanted to increase the volume of any speaker by three db, you'd have to DOUBLE the wattage provided to it.
So this is what I think may be causing the imbalance in your system. If you were to look up the specs on the speakers that you have installed, you might find that the rear speakers have a higher sensitivity than the front's.
Aside from those being possibilities, I'd say the rear channel amp in the radio might be functioning improperly.
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**Erik**
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