Ellen,
I Agree completely with Soundhound.
Years ago I was running a bunch of strung-together and very cheap (K-Mart special) interconnects totalling over 100 feet (!) to join two systems located at opposite ends (and levels) of my house - with no noticeable degradation in sound - or stray interference.
I would not expect any problems with what you are proposing.
Jeff Mackwood
_________________________
Jeff Mackwood