I don't see pre out/main in for this AVR.
In this case, I recall Khun Poj hook up of his system which should be good for both music and movie. Hook your front speaker to amp. Then feed your amp with preout of front signal from AVR.
However, there is no pre out too as I only find the pre out in 280x and above.
I guess if you really want to do it, follow what khun KJ said krub.