As has been mentioned already most cable manufacturers will make them for you... and you won't get any real benefit from doing this beyond just using straight RCA cables... and no don't use adapters unless you HAVE to. The more connections you make the worse it gets.
That said, I have two such cables for my surround channels where the processor ends are RCA. The cables are Ultimate Cables silver series.
That said, I have two such cables for my surround channels where the processor ends are RCA. The cables are Ultimate Cables silver series.