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The receiver's out put sections are grouped in pairs. Front left and right in one output, rear left and right in second output, and center channel and sub output on the third. Sounds like a semiconductor or semiconductors have gone bad in the center & sub output.
I had this problem too. Finally, after using the MCACC setup and making sure all the speakers worked, I found I had to set the source to FM, TV or whatever from the remote control and set the mode to advanced surround sound using the front panal button on the upper right. Had to fool with them a lot. Good luck.
unit needs repair. Look at the b speakers. Conect a speaker or two to the B position. If you have no sound than your surrond sound is ok and the unit is bad. Sound comes directly into the b speaker and not threw the surrond system. My 6070 has a cold start up problem. no sound. time to purchase a new one. to costly to repair.
If you are referring to the rear speakers, it is normal. The rear speakers are not supposed to get a signal as loud as the fronts or center.
A surround sound system was originally developed for playing movies and the rear channels are for effects. In most surround modes the center channel will always be the loudest with the widest range of audio signals.
I have been repairing these type of systems since they have been on the market, so I know a lot about them.
This Kenwood you have is like most surround systems and does not have a feature that you would obviously like to have, 5 channel stereo. Only a few surround systems have this feature and they cost much more than the Kenwood systems. Denon and Marantz both make one with that feature. In 5 channel stereo you get a full signal to all the speakers. All the other surround modes you get a much lower signal to the rear speakers.
So in closing, you do not need it fixed, there is nothing wrong with it. You have a common complaint that many people have who buy a surround sound system but are not fully understanding of just what a surround systems is supposed to be capable of
. This is something that the salesman who sold it to you should have explained to you, that way you could have purchased a system that would have better suited your needs.
I would be happy to give you more help if you would like, just let me know. As I already stated, I have many years of experience with surround sounds systems, in fact I own the exact Kenwood model that you have and I like it very much. It is about the best you can get for that price.
I had the same problem. Set the reciever on 6 channel stereo. On this setting, you should be getting the same sound out of each speaker. Isolate which speakers aren't getting sound. Now, on your speaker switch (the A/B button), select A. If that doesn't fix it, select B. If that doesn't fix it, try A and B (if you can on your reciever).
Now, when you switch back to pro-logic, make sure your a/b channel switch is in the position that worked in 6 channel stereo. Yamaha recievers have a memory, and when you switch various modes, it makes auto adjustments based on what you had set in the past.