Lena:

I don't know if you are right about Recoton going out of business. It may truely be sloppy web site development. In either case, I was able to find another link that has a picture that might help you describe the system and its trasmitter over the telephone. It also indicated that the Recoton may use RCA presumably to attach to a line out feed. If so connection to the Mitsubishi should be a snap if your friends can locate the transmitter.

http://www.recoton.com/_archived_sites/recoton_wireless/wire440.asp