Connect stereo speakers to iMac

Hello everyone,

Disclaimer first - I am not at all an electronics specialist, but stuck with doing all sorts of things TV/audio/computer/network around the house because my husband will not do it. If you could answer my questions without laughing at me too much, I will be very grateful

I have a pair of old (but nice) stereo speakers that I want to use with my iMac instead of the built-in speakers. Is there a way for me to use some sort of connector/transmitter/receiver to do that? I think I want to connect the computer to this "transmitter" via USB, and then the transmitter to the speakers through the RCA audio output. These are regular, not powered speakers. Am I thinking about this right?

If this sounds right, then should the "transmitter" have two sets of RCA output - one for each speaker? I have seen transmitters that only have one - how do I connect the two speakers, then? Two red wires from both speakers into the red socket, and two black in the white socket? Would I still get stereo sound if things are connected this way?

I found this device http://www.amazon.com/iKross-Blueto...56157756&sr=8-17&keywords=a+v+transmitter+RCA is this what I need? if not, can you think of anything I could use?

Thanks a lot!