I believe the problem to be the fact you are running the receiver in "all channel mode" and it is not up to the task of driving the new system with all channels driven. Did you have all channels driven when hooked up to your old speakers? I also highly doubt the old BIC's are more efficient than the M60's. I would say they are more than likely on par and you are not used to the greater detail the M60s produce over the more bass oriented sound the BIC's have with those large drivers.


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