I had the similar concern in that I purchased a 990/7700 and a monster powercenter. I am no electrician however my understanding is that all monster equipment is rated to a max of approximately 1800 watts which corresponds to the max rating of a 20 amp circuit. I think the 7500/7700 put out 1800 watts MAX. I suspect you would max out the amp/wattage rating only if you played music/movies very loud and had some high dynamic peaks. This was a big concern to me so If I have a wrong understand of how this works hopefully someone will correct me.