XLR is three pronged and eliminates some of the buzzing of RCA, that's all I know, although I'm interested in the topic.

Switchcraft now offers a stereo solution to the issue of injecting the unbalanced outputs of consumer and prosumer audio sources into pro audio sound systems. The new SC702 Series Stereo A/V Direct ...

Sorry to resurrect an old thread here - but did this work? I'm going down a similar road - unbalanced RCA outs to balanced XLR inputs on Genelec monitors - and it'd be great not to have get additional ...