I own my T777 v3 since 6 weeks now. I have a strange behavior with the A/B speaker setting and would request somebody to check whether this is normal or not:
I use only Speaker A. My speaker B terminals are not connected. I also haven't configured any additional Zone etc.
If I add Speaker B to Speaker A (by pressing the speaker B button on the front), then the volume increases dramatically by (rough estimate) +15dB. I.e. if the front display showed -20dB with only Speaker A, then I have to set the volume to -35dB with Speakers A+B to achieve the same heard volume level.
This behavior appears to be independent from the sound format. I.e. it happens also when playing a Stereo source like a CD. So it cannot be related to the Stereo downmix that is being described in the user manual when adding speaker B.
Despite I don't need speaker B, I have (test-wise) plugged the front left speaker from speaker terminal A to speaker terminal B. Also with a speaker B connected, a speaker setting containing Speaker B (i.e. "B only" or "A+B") is significantly louder as the "Speaker A only" setting.
My expectation would be that the volume does not change when adding or using Speaker B.
Could anybody please check at his unit whether this is normal or not? Thank you.
If you should ask yourself why this might be a problem: My children like playing with my gear, and I live in a flat. If the volume increases dramatically just by pressing the speaker B button then my neighbours would probably not like it