Anybody know about this amp. Bought it recently to replace my Yamaha A5 and everything sounds great, however, the sub sound very very different to what it was. The sub (Yamaha) with the A5 had plenty of slam and bang, yet with the Onkyo there is no big slam at all, everything is very subtle. To be honest I am not sure what I prefer, just asking if an amp would make this much difference to a sub(the sub is active). I have also had to turn the sub up to 3/4 where it was always at 1/2 before.