Don't think the cable length has much to do with it but I could be wrong. What's important here is how far apart the MICS are (not how long the cables are). Add roughly a 1 ms delay for every foot the mics are apart (and if you're matrixing then it's the distance from the stage mics to your AUD mics). Once the sound is picked up by the mics, I think you are running at the speed of electrons at that point, so no delay, but prior to the mics picking up the sounds, the delay is very real. Now at ten feet, it might not be an issue, but at 20-30+ feet definitely. Someone care to correct me on this?