I just installed a new amp to run my front polks and after a few minutes of playing with the cross over and wondering why they sound different I find I forgot to switch the HPF on. When I bought this amp I had to decide whether I wanted a 60 watt 2ch for the backs or a 100 watt 2ch for the fronts, and bridge my 4ch to a 100 watts. So I went with a 110 watt amp to power the fronts. I'm not to worried about giving to many watts to the front with a 10 watt difference, but the 40 watt over difference I'll see on the rating for the rears startles me. Right now its running 40 watts and you may say a 20 watt increase to 60 isn't a lot, but its a 50% increase. Well I suppose I could always bring it to a local car audio shop.