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Thanks for answering, ok one thing I noticed is that the model you have is probably a KDC-MP735U or the KDC-X792 I couldn't find a 740 anything, not saying you are wrong but I couldn't find it anywhere online. And all of the RCA's you have coming out of there are 4volt preamp outputs with one set for the front, one for the rear, and one for the subs. This headunit has a ton of features if it is in the same family as the ones I listed above. If you know it is a good unit then I would guess that the problem lies in the settings...It seems that you can adjust the output level of each set of preamp outs so there could be a difference in the amount of voltage you are allowing to each set of outputs. This of course is just a rough guest...If the speakers are the only problem then I would look at the settings for each set of outputs and match them, also check to make sure you have the right speakers run to the correct outputs. Its hard to say man cause it could be so many things. Right off the bat you have unamplified fronts, and amplified rears so its logical to assume that there will be a big difference in volume between the two. I would play with the gains a bit more, and check those output settings as well. The only common link between the front speakers and the rear speakers is the head unit, and you did say the problem is present in the front and rear.
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