What would be the benefit of balancing the unbalanced line at the input of the next stage? The idea is to use a balanced line from the source output to the next stage input so it is balanced all the way. You're trying to keep the path balanced from output to input to avoid hum and RF being induced in the cable. If the signal is unbalanced at the source output and using unbalanced cable to the next stage input, what's the point of turning it into a balanced signal once it's in there?
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