There is more to amplifier design that the kind of output transistor used and the choice is up to the designer. And not all speakers are in the same difficult to drive category as Wilsons. Hell my old JVC boom box uses bipolars but it doesn't compare to my Pass amp.
Ps Audio BHK Signature vs Parasound Halo A 21+
Ps Audio BHK Signature 250 vs. Parasound Halo A 21+
Wich one is Better Thanks
Wich one is Better Thanks