Reddit mentions of IEC 18 AWG 6' Speaker Wire with RCA Male Cable - Black

You probably need something like this

http://www.amazon.com/IEC-Speaker-Wire-Male-Cable/dp/B003U44LA8

But I'm not positive

You need something like this. Keep in mind polarity. You're going to have to find out if the pin is + or -. If you want to use it sub, it must have speaker level inputs, either spring clips or binding posts will do, forget line level. First you run that fancy RCA to speaker wire to the speaker level input of the sub. Next you run normal speaker wire from the sub to the speakers. Do not any any circumstance run a RCA to RCA connector to your sub with the outputs of that receiver.

Assuming your speakers have binding posts/screw terminals on the back, then you need a cable that has an RCA male connector on one end and bare wire on the other end (something like this example from Amazon).

You'll need two of them (one for the left speaker and one for the right speaker). Connect the bare wire ends to +/- on the speaker, the plug the RCA end into the amp. The positive connection on the speaker is usually the wire that goes to the center post on the RCA end.

If you can solder, you can just buy a couple of RCA connectors and solder some lamp cord/speaker wire to the connectors. Or if you have a spare/cheap RCA cable laying around, you can cut the connectors off one end and then strip the cable to get at the center conductor and shield. This can be a bit fiddly as the wire is usually pretty thin; it may help to tin the wire that you expose with some solder. Then just connected the tinned leads to the speaker terminals.

Get two of these. Plug goes into deck, wires get wrapped on that top set of terminals labeled "<---------- Speaker". Just unscrew the nut a little bit, wrap the wire around the post clockwise, then tighten the nut down to hold it in place.