Converting Speaker Wire to RCA?

[MrHT]

5 years ago, I bought a nice, simple 5.1 Sony Home Theater in a Box. Very soon, I plan on upgrading my system. I just want to replace the receiver only because I hate having to throw away 5 perfectly good speakers and the subwoofer.

Here's my problem....

The subwoofer that came with the Home Theater System uses speaker wires to hook up to the receiver rather than the usual RCA cable. When looking at all the receivers currently on sale, no receiver seems to accept speaker wire for the subwoofer. They all accept RCA only.

So, is there any way I can convert the speaker wire into RCA so I don't have to buy a new subwoofer? They're all very pricey, so I hate to have to buy a new one. I'm pretty content with this subwoofer I currently have.

Any help would be greatly appreciated. Thanks!