I need to connect my CPU and AVR to my crossover, but the x-over only has 1 set of inputs. I have XLR inputs/outputs on the x-over and the CPU, but not the AVR.
Would I introduce interference or ground loop noise if I ran XLR from CPU to X-over, with a y adapter to splice in RCA audio coming from my AVR? Or would the XLR's be unaffected by the presence of the RCA's?
If you wire an RCA connector to an XLR, pins 1(gnd) & 2 (-) of the XLR are tied to ground on the RCA. Pin3 (+) of the XLR goes to the center pin of the RCA. As soon as you connect the "-" pin to the ground, you have unbalanced the RCA and you MAY have a ground loop situation.
To stay balanced and maintain the correct impedance match, XLR and RCA cannot be passively integrated.
Thanks a lot, gizmologist...that was just the answer I was looking for and I kinda suspected that was the case. Any suggestions for a solution to my problem? Does anyone make an affordable switch for rca/xlr connections? Or am I better off just running rca all the way? It's gonna be a 50 ft run from the cpu to the x-over and I'm worried about signal loss over that length.
The Switchcraft transfomer shown has been around a long time. Switchcraft makes a whole series of barrel-style audio problem solvers.
To use that, you still need to make an RCA to XLR adapter cable using the pinouts I posted earlier.
The transformer specs are usually OK for most commercial audio functions but they roll off severely at lower frequencies so using them for a sub feed may be less than stellar if you are looking for uber LF gut-thumper sound.