The sound level is not the same on different channels

All channels have differences in brightness, sound level ect, this isnormal

Hello,

I have found that most channels broadcast at different volumes, more so when it comes to commercials. Something I will never get used to, but we can do nothing about. You might be able to find someting in the audio menue of either your TV or Sound bar that will help some . . .

It sounds as if the input is too low. what happens if you plug whatever is going into the stereo channels into a pair of mono channels. Or are you taking about the phono stereo tape input?
The stereo channels are line level whereas the other channels have both line and mic level inputs, what are you trying to put through the stereo channels? You must make sure the gain switch is set to the -10dB to get the most sensitivity (the mono channels have about -132dB max sensitivity BTW) You probably need a different mixer or possibly a submixer if you are needing more than 4 low level inputs.

Sound circuit card has likely failed. Without the proper electrical tools (oscilloscope) it is hard to fix. Take it in and see what they say it will cost to repair. Take to at least two different shops.

Hi,here is the basic info for your question..
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Hope this helps!

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Surround Sound System Settings ---- Correct Time Delay Setting in Multi-channel Audio

A correctly set surround sound system can yield dramatic improvements to your
home theater sound or multi-channel music listening experience. In particular,
a correctly set time delay setting between the different channels is essential
for a realistic and unified surround soundfield.
Luckily, most of today's surround processors make setting the time delays
between the rear and the fronts a matter of a few entries in the setup menu.
Yet having a proper understanding of the principles behind correct time delay
settings is essential for the best results.
In this guide, we explain the principles behind time delay settings in surround
sound and show you how to adjust your surround processor or AV receiver for the
best surround sound field.

Time Delay Setting in Multi-channel Surround Sound Systems

Correct home theater speaker placement and properly balanced sound levels
between the different channels in multi-channel audio, while crucial, are not
enough to sustain a unified soundfield in a surround sound setup. A correctly
set surround sound system requires that sound from all the different speakers
reach the listener at exactly the same instant.
This explains why all fronts, left, right and center channel speakers, should
be set at exactly the same distance from the listening position. At the same
time, in a typical home theater setup, the surround speakers are closer to the
viewer than the fronts.

To compensate for this distance discrepancy, surround sound playback systems
apply a split-second delay to the surround sound channels.
----------------------------

.. or read the manual about setup and getting multichannel audio from 2-channel sources. Calibration and Selecting a Sound Field.

Distance is linear spatial separation of two points. dB is audibility, sound pressure level, volume. The distance setting affects how the various channels are delayed to arrive at the primary listening position at the appropriate time to provide a plausible sound field. Simply making one or more speakers louder or softer will not affect the spatiality of it.

The STR directs sound to the center as instructed by its speaker setup. You say the center does not work on calibration. Is it defined?

Prove another speaker does or does not work on the center output. Then we'll know if it's the receiver or the speaker ensemble that has the problem.

Have you checked the manual for this "
There is no sound, or only a very low-level sound is heard from the center/ surround. "?

turn the other speaker decibal levels down then increse main volume until you are satisfied.

May be a defect but, if you notice the sound changes with different channels or movies or HD or Standard, look for a volume limiter control button in the menu setup under audio control. Sometimes the menu has a control that you can turn on to limit different volume levels during the shows origination.

It could be that the unit is bad, it could also be that the device providing the input is bad. I doubt the cables are bad, but that could be also. Could it be possible that your television has a menu setting that turns the outputs off and on?

Even without the sub, you still get sound through the Bar.

Only way to test it is, different cables, alternate device to provide input for sound.