Audiophiles, generally don't like class D amps!

[egellings]

Yes, an SMPS obviously also has a transformer That’s still not something specific to AB amps though, as you already mentioned.

Some DC to DC converters, called buck converters, do not use a transformer. They use an inductor. There is no isolation, and they are used in low voltage applications sites on PCBs, say near a section that needs 3.3Vdc on a board using 5Vdc everywhere else. Buck converters source voltages lower than their input voltages.