At 10:53 AM 5/24/2011, Mark E. Skeels wrote: > > All in all this sounds like a bad idea. Even if you do just have cable= s > > with no electronics, you still end up with two separate signals squishe= d > > next to each other in a common run. I expect you would get some crosst= alk. > > > > >Interesting you should mention that. I noticed if I left one channel >disconnected there would be crosstalk across channels in the cable, but >when both sources were connected, it went away. Actually, although what Mark did is generally regarded as a 'bad=20 idea', there are mitigating circumstances. 1) The guitars all had built-in preamps. That means that the output=20 impedance presented to the interconnect cable was fairly low=20 impedance, and probably significantly higher level than normally=20 comes out of a guitar pickup. 2) The keyboard most likely has a very low output impedance (22R to=20 100R in any of the keyboards that I've worked on). In other words, it should have worked very well. Mark - I strongly suspect that one of your adapter cables has a short=20 between pins 2 & 3 of the XLR connector. Either that, or one of the=20 cables in the stage box has those pins shorted. Here's why I think that: even though the guitars have built-in=20 preamps, most of the guitar preamps that I've worked on are built=20 using discrete transistors rather than op-amps. The output impedance=20 in often in the range of 1K to 10K. The keyboard most likely has a very low output impedance. Thus: if=20 the guitar signal were shorted to the keyboard signal, the low output=20 impedance of the keyboard would attenuate the guitar signal significantly. One way to have confirmed this would have been to have seen if the=20 keyboard signal showed up in two channels on the mixer. That's my best guess based on what you have said so far. dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .