I would like to know if the "common mode rejection" used in the 7500 makes it a better amp than the 7200 in terms of sound quality. I bought the 7200 during last month's sale. I have it set up in a 5.1 setup and it is a much improvement over using a receiver. (so two channels remain unused).

As I read more about the Outlaw amps I am a bit concerned I did not purchase the 7500 for the same price. People have stated there is audible improvements using the "common mode rejection" amps (7700 & 7500) over "single-ended designs" (7200 & 7125). Baring any unforeseeable events I plan to use the amp for a long time. My question is should I send the 7200 for a 7500 while I am still within the return window or just keep the 7200. Thanks.

Edit.. I do not care about the XLR connectors since my preprocessor is right next to the amp