Sangram Rakshit wrote on Wed, 17 November 2010 23:54 |
@Charlotte: Thanks - This would be fine on the input, but if Pin 1 is a floating cold pin would that not cause undesired operation?
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Pin 1 is shield ground and should always be connected on properly designed gear.
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I have a E-mu 1212m with a fully balanced output, and grounding the cold end really makes it sound terrible if the amplifier is unbalanced, so I run it with pin 1 floating instead.
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Hot= pin 2
Cold= pin 3
Shield=pin 1
Some poorly designed gear will have hum issues if stray shield/ground currents between chassis are allowed to corrupt the audio (bad internal design).
Some "balanced" outputs don't load sense the outputs, so a dead short on pin 3 or pin 2 will cause distortion and lots of ground current that can cause crosstalk into other feeds.
So depending on the gear, to interface a (3 wire) balanced output to (2 wire) unbalanced input, the cold audio output line is either shorted to ground (pin 1) or left floating, which ever works best with the particular gear design.
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@Ivan - we have certain 'political' reasons which compel us to continue working for this client. I agree with everything you've said and we've finally decided to pad the system down to the extent that will avoid damage even at the loudest volume, and tell the client that that is that. If they want more level, they need new speakers.
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JR
PS: I will apologize in advance for making this bad joke, but what country do customers from India get when they call customer service?