I'm not highly experienced about this, but yes many amps are built with unbalanced topology using a balanced input line receiver or transformer & then driving the unbalanced amp. You do not get the full benefits of a fully balanced design unless all components in the signal path are full balanced from input to output, but you still have the benefit of balanced interconnect noise reduction / cancellation. Ayre Acoustics' amps are in fact full balanced & they are dead quiet. Don't all know about some of the others; McCormack's older DNA series amps are unbalanced internally.
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