RCA to 25-bit


I want to connect a standard two-channel source (e.g. left and right RCA) to a 25-bit 6-channel input on the back of a sunfire theatre grand mkII. So far, the only company I've found who makes a cable is monster (a $90 cable that has 6 RCAs on one end and the 25-bit on the other end). Does anyone know if another company makes the same thing, using better interconnect cabling? Or if there's a company that makes an adapter to plug two rca cables into a 25-bit? I don't think this cable will do it for me, but I'd like to pursue this method of interconnection...
dbw1
Is it really a 25bit(!) connector or a 25pin connector? I suspect the latter since there's no A/D converter in the cable. As for the $90, that's not too expensive for such a complex device but you can build a 2 (or more) channel equivalent more cheaply.

Just buy a 25pin connector and 2 coax interconnects at Radio Shack. Cut off one end of each coax and solder the leads to the appropriate pins on the 25pin connector. I assume that the connection info is in the Sunfire docs.
yes, i meant 25 pin. looks like the printer connection on the back of a cpu. thanks for the advice kr4. i'm actually not looking to do it cheaper than $90, i'm looking for cabling that's higher quality than the monster.
Why would you want to put a two channel source into the multi-channel input on your processor? This doesn't make any sense. Just hook up the analog stereo pair to one of the normal stereo inputs. The multi-channel input is for analog sources that output 5.1 (like DVD players with built in decoders or separate surround processors).