On 5/24/2011 1:40 PM, Dwayne Reid wrote:
> Mark - I strongly suspect that one of your adapter cables has a short
> between pins 2&  3 of the XLR connector.  Either that, or one of the
> cables in the stage box has those pins shorted.
>
> Here's why I think that: even though the guitars have built-in
> preamps, most of the guitar preamps that I've worked on are built
> using discrete transistors rather than op-amps.  The output impedance
> in often in the range of 1K to 10K.
>
> The keyboard most likely has a very low output impedance.  Thus: if
> the guitar signal were shorted to the keyboard signal, the low output
> impedance of the keyboard would attenuate the guitar signal significantly=
..
>
> One way to have confirmed this would have been to have seen if the
> keyboard signal showed up in two channels on the mixer.
>
> That's my best guess based on what you have said so far.
>
> dwayne
>
I will check the cables at the earliest opportunity.


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