Maybe double check the wiring to make sure nothing is crossed as -10 on mine in my room is incredibily loud, -20 to -15 is the norm for me to listen to movies, but it could just be the calibration and/or room differences.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70