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Without trying to hijack this thread on something model specific, Solderdude (total respect!) and I have been having spirited discussion about the venerable old AKG K240. It is the only set of cans I know of that are PURPOSELY wired "Inverse In Absolute Phase".
WHY would they do this on purpose and not follow convention like all the rest of the cans I know of?
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As per the avatar photo…
The Audible Illusions Preamp (line stage) is inverting.
If the the AKG were designed to be used with an inverting amp, then they would need to be inverting to get back to being upwright.