Steve Eddy
Member of the Trade: The Audio Guild
Aka: TempAccount555
- Joined
- Sep 28, 2003
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'No negative feedback' is Ayre's marketing position however the reality is a little different when the types of DACs are taken into acoount. All S-D type converters (the ones that Ayre use exclusively) rely on negative feedback internally. So I would guess that Charles Hansen only thinks feedback is bad in analog circuits, not digital ones. Or that he ignores feedback in digital circuits to maintain a certain marketing image.
Charles also ignores the 100% negative feedback of a follower circuit. Instead, he calls that "emitter degeneration," (assuming the use of bipolar devices) instead of negative feedback. And of course it's that 100% negative feedback in the follower of the Pono's output stage that gives it it's 5 ohm output impedance.
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