to answer your original question .. yes there is a 1/8th inch to RCA adapter. you want the stereo version, not mono as the plugs on your audigy are stereo.
If you get the adapter that is encased within itself. .. like
this ... you won't get any noise as it's pretty close to a direct connection.
get it at radio shack ... get it at best buy if you want it to say "monster" on it ... or get it from a local shop like buddy suggested (i wish i had alocal shop around here ... we had one ... then radio shack bought it ... then closed it)
regardless ... one of these adapters is the only way to get that 1/8" to RCA so you can use your cables
__________________
My JeepPC Install
"there are no stupid questions, just stupid people."
"it's been agreed the whole world stinks so no one's taking showers anymore"