balanced line input with gain switching, comparison

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Dimitree

Well-known member
Joined
Jul 26, 2011
Messages
130
hi everyone,
while looking at the Allen Heath GS3000 schematics, I noticed they implemented two different circuits to accomplish the same task (if I'm not mistaken): +4/-10 gain switching for the balanced input receiver.
First one is used on the channel stereo input, second one is used for the tape input return.
Which one is a better approach and which one gives best CMRR? (I'm just wondering, not that I need to copy those approaches, I believe there are better approaches nowadays).
thank you

allen1.png allen2.png
 

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