I am not sure if anyone out their would have sent for both amps from Outlaw to make a comparison. I own the 770 and can tell you that it works properly and sounds fabulous, (even my wife noticed the upgrade; you know the type of wife who rolls her eyes evertime the topic of electronics comes around). Currently I am only using 5 out of the 7 channels because I have not installed the back two speakers yet, (wife has to approve of their location). I like this type of flexibility of using as many channels as I want without having to buy more amps later. Enjoy making your decision, this is the fun part of home electronics. If you decide on the 770 I believe you will be pleased.