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In Reply to: RE: balance vs unbalanced posted by John Elison on April 27, 2015 at 01:49:21
It's funny that you can read that paper and come to the conclusion that a balanced connection must include a differential amplifier. The paper actually says the complete opposite.
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> It's funny that you can read that paper and come to the conclusion that a balanced connection must include a differential amplifier.
What you've shown is a passive balanced output. This still requires a differential input to be meaningful. In other words, the only way to to reject noise is to have a differential input. Consequently, the only advantage of the passive balanced output shown below is if you have a differential input on your amplifier. Of course, I'd imagine the differential input could be accomplished using a transformer in place of an active differential amplifier.
I hope you realize there are two parts to a balanced connection that include the balanced output of one component to the balanced input of another component. You don't have a balanced connection without both. I also hope you realize that a passive balanced output contains an audio signal on only one of its two signal lines. The other line contains only noise picked up by the interconnect. Therefore, without a differential input at the other end, there is no way to reject the noise.
Anyway, I guess the original poster can do his own research and make up his own mind. However, when I explain the important points of a balanced connection to someone who obviously knows nothing, it's the differential input receiving two balanced out-of-phase audio signals that describe the essence of a balanced connection.
Best regards,
John Elison
"What you've shown is a passive balanced output. This still requires a differential input to be meaningful."
You are absolutely 100% incorrect. Transformers reject noise on their own. Also, what if we have a push-pull input stage on the amplifier? You're missing the point: Balanced/unbalanced connections can function independently from the circuitry that follows them.
"In other words, the only way to to reject noise is to have a differential input."
No, you can use a transformer.
"Of course, I'd imagine the differential input could be accomplished using a transformer in place of an active differential amplifier."
This is sort of like saying that you could make a cup of coffee with the pacific ocean. The transformer doesn't make a differential input, it makes an isolated balanced input.
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