I moved into a new house that already had speaker wire hanging out of the wall in the living room, all set up for a 5.1 surround system. I've bought some nice speakers: Q acoustics 7000i plus I've bought a nice av receiver: Denon avr3300x But now my complete naivety when it comes to setting things up has come to light. Although I have speaker wire hanging out of the wall, with a black and red wire, the other end seems to be an RCA head. (2 wires going into a single RCA plug.) One for L, R, C in blue and an L and R in orange. Which I assume are front left and right, center and surround left and right respectively. The Denon expects speaker wire connections, not RCA, and I although I can google and find plenty of info about converting speaker wire to RCA, I can't find anything about the other way round, except some warnings about low level and hight level that I didn't really understand, but I get the impression speaker cable and whatever an rca line is, are not the same thing. So, is it speaker cable? can I just chop the ends off? Do I need an adapter? I know the simple thing would just be to buy a big reel of speaker cable and use that but it's not that easy as the existing cable is already inside the walls and under the flooring so I'd like to be able to use that if possible. Any help would be appreciated.