First see if the connection of the speaker are connected in the right terminals, REAR speaker should be connected to REAR or ZONE 2 speakers(Surround Speakers). Next is to check the settings on the units's " SPEAKER SETUP" menu, as seen here PICTURE1 Next would be the surround parameters, a wrong surround parameter or setting may lower volume on channels depending on where it is set to, or "shifted to" Please refer to this next image. PICTURE2 In the above pictures, I have highlighted or "boxed" the necessary things you may want to check. To furthermore guide you to set your unit's setting please download this manual,and make it a reference.
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First see if the connection of the speaker are connected in the right terminals, REAR speaker should be connected to REAR or ZONE 2 speakers(Surround Speakers).
Next is to check the settings on the units's " SPEAKER SETUP" menu, as seen here
PICTURE1
Next would be the surround parameters, a wrong surround parameter or setting may lower volume on channels depending on where it is set to, or "shifted to" Please refer to this next image.
PICTURE2 In the above pictures, I have highlighted or "boxed" the necessary things you may want to check.
To furthermore guide you to set your unit's setting please download this manual,and make it a reference.