Let me explain. Right now all of my equipment is in boxes as our new house is being completed. I have a Rotel 1066 and JBL Synthesis 5 channel amp. This is going to drive Rocket 750's with their big center channel speaker. I am thinking I want to go for 7.1 sound. I need to add another two channel amp to power the two back center speakers. Do I need to get a JBL Synthesis to match? Or can it be another?