I have a 7.1 system set up. I use the 750 for the left, center, right, and dipole surrounds left and right. I'm using a inexpensive onkyo sterio amp 150 watts a channel for the back left and right surrounds. All my speskers are paradigm. The side surrounds are dipole and the back surrounds are direct radiating. I love the effect the extra speakers make. I've found that when there is enough surround information to make them work...it always sounds great!!! Remember there isn't alot of information going to them in the first place so if you get enough power to them and there the same kind of speaker they will work just fine!