My B&K 200.7 is 70lbs and drives my Wharfedale Opus 5.1 system louder than I'll ever need it. And, I have actually had to move it more times than I ever thought I would. The 7900 is 145lbs. you can't move that alone unless you want to ding the amp, and all of your furniture. What speakers are you driving that need 300w/ch?