audio volume difference between tuners vip 922

[sgt940]

I have started to notice a difference between the audio volume levels between tuner 1 and 2 on my 922. You can set both tuners to the same channel and hit the swap button, significant difference in volume level. Anyone else ever seen this. Had the 922 for a couple of years and recently swicthed sound bars, just now noticed the difference. Can't see where it could possibly be the sound bar.