Movies are mixed to be watched at 'reference levels' ( a zero reading on most avr's) which means dialogue is in fact very quiet and the loud parts get very LOUD, up to 105db @ reference, boosting the centre channel 2-3 db even as high as 5 db helps even things out; IIRC, I ran my VP150 4 db higher.

I am not sure if concert DVD or BRs are mixed to the same standards as movies.

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