RCA to XLR interconnect wiring diagram

Thanks, ran the 4 signal wires to pin 2 and split the 4 ground wires 2 to pin 1 and 2 to pin 3 and I'm up and running with no hum at all. Brian

Caution against running the ground to pin 3. This shorts the negative pins of the right and left channels, which were never meant to be shorted together!
If you're lucky, this will only cause mild distortion...
Instead, run a resistor between pins 1 and 3. The value depends on the citcuit. Try 10K for transistor amps or 100K for tubes.

I must have gotten lucky with the preamp/amp combo. The preamp and speakers have been in my system for a while, but the amp is a new addition and I'm just not hearing the distortion. With a transitor amp it should have been wired ground to pin 1 and a 10k resister between pin 1 and pin 3 then right? How about going from a balanced crossover to a single ended transistor amps, would I wire the female XLR the same way with a resister between pin 1 & pin 3? Thank you for the help.

My experience is the same as spfury's. I use the wiring I suggested above with all of my unbalanced source components RCA outs (DVD, VCR, TV) into my balanced preamp XLR ins with not a sign of noise even with the gain at max. I think you're fine as is.

Going from balanced to RCA you would do just as you say. Terminate pin 3 to 1 with a resistor, depending on the the load at the destination (which "looks" from pins 2 to 1).
I'd try and match that load, so the balanced stage sees a balanced load. Not always a necessity, since some equipment just use an inverting buffer for the negative output...
With that kind of equipment, my question would be: why bother?! :-(