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24.27.41.140
In Reply to: RE: Even simpler. What is the input impedance to your subwoofer amp? posted by Lew on July 12, 2024 at 18:04:30
Not all balanced outputs are referenced to ground. This should be confirmed by reviewing the specs or the schematic for the preamp before proceeding.
Follow Ups:
Exactly.
In a pure balanced line, there is no ground. There is only a shield, which is NOT the signal ground of components at either end. This is best implemented with a transformer. In that case, you can ground one end of the secondary to get a single-ended connection.
Many (most?) modern balanced components are more like differential lines, where there are two signal paths in opposite phase, which share a common signal ground. This is a decent approximation as long as the impedance to the source's common signal ground is much, much smaller than the receiver's impedance to ground. That means you can't just connect one side to ground.
Many problems are caused by the confusion between signal and shield grounds ... :^)
Yes. Ground is floated at the balanced outputs. Which is why I originally thought I needed to use a transformer, in the way that you mention which is to ground one side of the secondary while taking the SE signal off the other side of the secondary.
Edits: 07/13/24 07/13/24
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