I have a basic understanding of ohms and wattage, etc. I have been considering changing my amp head to one of the class D amps in an effort to save my back! I have been using the Ampeg 2BRe with a Workingman 2X10 combined with the SVT 1X15. Combined the two cabs equal 4 ohms which gives me the full 450 watts from the head. That much I get. The amp that I was considering was a MarkBass 800 watt head (not sure of the exact model). The two cabs separately are 8 ohms rated for 200 watts RMS. In real life application, is the power of the head going to be to much for the speakers? I do play loud and for long periods of time. Thanks for the advice/help. Relying on the goofballs at the music stores usually results in bad/wrong advice.