I'm confused. Is there a hard and fast rule for power amp wattage versus cab rating? Is there a point where it becomes overkill? Below are two options I'm considering (two identical cabs, one per channel) For instance: A) AT 4 OHMS is it okay (or even preferable) to use a poweramp capable of 750 watts per channel at for a 4 ohm cabinet that's rated at 450-500 watts? OR B) 8 OHMS Where the same amp is putting out 400 watts per channel into an 8 ohm cabinet rated at 450-500 watts? What, in your opinion, are the advantages of each? And which would you chose?