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RE: The benefit is one of noise reduction.

"Transformers also have limited bandwidth, and present a resistance to the AC line for high-frequency noise without passing the noise along to the load. This may provide a large benefit in some circumstances. This is why I asked if you had compared the balanced versus unbalanced configurations using the same transformer. The reduction of AC line noise should be similar in either case."

Correct me if I'm wrong but an unbalanced isolation transformer cannot address Differential mode or Transverse mode noise. Common mode noise is addressed by both but an unbalanced transformer noise reduction is on the order of ~30db's. With a high quality balanced transformer, the noise reduction for the 3 aforementioned modes run from 42db to 62db to 84db respectively measured from 1Hz to 100Mhz.

One also has the advantage of zero noise/hum being induced into other nearby/adjacent power cords and IC's because of the power conductors used for feeding components are of equal and opposite voltages that cancel each other out. Of course, one must carefully route the balanced transformer input supply power cord :-)

There is also the advantage of the energy stored in the transformer which acts like an AC storage battery and will "stiffen" the transformers output during sudden transient demands from say an amplifier/subwoofer.

It would be interesting to compare an unbalanced isolation transformer with a balanced transformer of the same output current capacity in the same system.

Cheers

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