I'm a little confused, if your friend purchased a 5.1 system, it is not capable of 6.1 or 7.1, you can't just add a speaker? Most likely the jacks your referring to are for a second zone (room) and can't be used for surround.


M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85