I also believe that the T752 can process 7.1 (quasi 7.2 actually I guess given L/R sub outs) - this would allow you to power mains from the external amp and reroute the rear and center signals through the internal T751 amplifiers.
I have no plans to go 7.1 myself, but as a T752 owner I was pleasantly surprised to see this as it gave me the ability to upgrade mains power without wasting the front amp channels.
I have no plans to go 7.1 myself, but as a T752 owner I was pleasantly surprised to see this as it gave me the ability to upgrade mains power without wasting the front amp channels.