This statement ignores the fact that loop feedback compensates for this sort of thing.
This statement ignores just how much loop feedback is needed to fully compensate for this sort of thing. We all know what too much feedback has the reputation to sound like.
And also ignores if there is no global feedback just local feedback which many good amps use, as well as some amps that don't use feedback.
Like I said before 73max OP your better off using an amp that is right for the job, and not spending money on autoformers, better spending it on the right amp instead which your B&W 802D3 deserve.
Cheers George