I think Jim Austin gave a pretty good account of the design intent: ie deliberately eschewing feedback in the interests of improved SQ into tube friendly speakers - rather than designing a panacea for all speakers. It‘s also interesting to note that Jim confirms that an amp that measures worse (ie without feedback) can actually sound better.
He also made the interesting point that some speakers like to see high output impedances. From memory, I think these these mainly fall into the single driver category. Speaker matching is always important to a certain degree.
He also made the interesting point that some speakers like to see high output impedances. From memory, I think these these mainly fall into the single driver category. Speaker matching is always important to a certain degree.