I have a four channel amp putting out 40 watts each channel that I want to bridge to 100 watts on two channels and a 2 channel 110 watt amp. As of now I was thinking about putting the 110 on my fronts rated for 100 watts and the 100 watts on my two rear speakers rated at 60 watts. I know a lot of people do this successfully, but is that achieved with a voltmeter. Any tips appreciated.