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Old 24th February 2008, 07:39 AM   #1
schodge is offline schodge  United States
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Question XLR Shorting Plugs

Most of what I've found on the web regarding creating XLR shorting plugs (to try and reduce noise picked up through unused inputs - worth a shot) shorts only hot to ground, and not negative as well. Is there a reason for this?

With my RCA shorting plugs, I "shorted" using a 1k resistor - partly because I was worried they might get unintentionally stuck into an output and fry an output stage, and partly for a reason that I thought was quite good but I can't currently remember. Given that the first is impossible for XLRs, is there a good reason to use resistors instead of straight shorts?

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Shayne Hodge
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Old 24th February 2008, 11:00 AM   #2
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XLR shorting plugs are usually used when a RCA is wired is parallel with one side of the XLR input. The shorting plug would be inserted into the unused side of the XLR when the RCA is in use. An XLR iput on it's own should inject very little noise into the system as XLR uses a balanced system with an inherently very high CMRR. Most any noise that is picked up should be common to both the +ve and -ve line in the XLR and so cancelled before it can really get too far into the system and cause problems.
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Old 25th February 2008, 07:13 AM   #3
schodge is offline schodge  United States
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Thanks, that was so obvious in retrospect I have not a clue as to what I was thinking...

Shayne Hodge
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