From what I understand you want to connect the 5.1 energy speakers to your 7.2 receiver (which one is it?).
1. And connect 2 speakers from the sony system and expand the 5.1 to 7.1.
2. And connect the sony sub to this and make 7.1 to it 7.2.
Right?
Here are the specs for the sony.
http
/www.sony.co.uk/support/en/content/cnt-specs/BDV-E870/list
Note that,
1. The sony subwoofer is an passive sub. So you can forget about using it with the receiver. If you want to use it then you will need to power the subwoofer somehow.
Secondly. Even if you can connect it somehow, dont bother. That looks like a crappy sub. You are better off using the single sub from Energy. Energy classic is a pretty good budget system.
2. You could use the...