"Balanced" as it applies to headphone amplifiers, or "balanced" as it has been MISapplied to headphone amplifiers?
Actually, "balanced" with regard to their OUTPUT, I don't have a problem with per se. Since "balanced" has always been associated with a balance of impedances vis a vis common mode rejection, everything's fine on the output side of things. The output is balanced and the headphones are also balanced as well as differential so there would be common mode rejection.
My quibble is on the input side, where bridged amps are technically "balanced" from an impedance standpoint,
but not differential so you don't get any common mode rejection.
Ah well. I'll shut up now.
se