Follow up questions regarding my NAD C375BEE

Pgawan2b, I do think you are offering good advice, however, the part about looking at the fuse makes no sense. That is an AC power fuse, so if it is blown, the unit will be totally dead and not work. The unit works, but with the protection circuit activating prematurely.

Update:
It looks like the OP started a thread at Audioholics at the same time, it's about the NAD C375, Totem Ones as well with the NAD protection circuit activating too. Later on in that thread, he adds that his previous integrated, an Anthem 225, had issues too. One speaker was much quieter so he had to adjust the balance knob and decided the Anthem was going and bought the NAD.

Now the NAD needs the balance adjusted too, but it's shutting down as well. Anyway, it's all there in the thread, 2 capable guys are helping him and they think the Totem ones or the sub is damaged.

Tls49, good point and thanks for the correction.

A number of good comments and suggestions have been provided above. I'll add one further thought while awaiting feedback on what has been suggested:

Are you certain that the two speakers are connected with the same phase, i.e., that + and - are not interchanged in the connections to ONE speaker?

If the two speakers are not connected in phase with each other, some of the results would be vague and diffuse imaging, and weak bass. I'm thinking that in some circumstances a result might also be the channel imbalance you have perceived, and also a perceived reduction in volume (which would be further compounded in one channel by the balance control offset). If so, to achieve reasonable volume and bass perhaps you are turning the volume control up high enough to overload the amp, with the clipping distortion that would normally result from doing that perhaps being prevented by the amp's soft clipping feature and/or by the amp's unusually large dynamic headroom.

Also, as Pgawan2b suggested, verify that the bridged mode switch on the rear panel is set to off/stereo. If the speakers are connected as a normal stereo pair but that switch is set to bridged mode, it would cause similar effects to those I described above for an out of phase speaker connection.

Regards,
-- Al

One more thought: Make sure that the black wire from the REL is connected to one of the negative (probably black) speaker terminals on the amp, and not to one of the positive (probably red) speaker terminals. If the black wire is interchanged with either the red or the yellow wire from the REL, and is connected to a positive speaker terminal on the amp, I believe that could account for all of the symptoms you have described here and in the other thread that was referenced above, and (consistent with what you have reported) could result in the amp shutting down even if the sub is turned off.

Regards,
-- Al