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They're about 83 dB/1 watt/1 meter, and my multimeter measures them to be 3-3.5 ohms.

A quick Google suggests that the Mk II gets hotter than the Mk I but I couldn't find any information on the amp circuit. DC measurement across the posts (and add a third because loudspeakers aren't a standard/passive load) confirms they are 4 ohm nominal. So no stray wires.

Looks like the Adcom just likes frying eggs when hooked up to speakers with low nominal resistance. And yes, it's hard on the transistors for them to get that hot (and other components, especially near the transformers & heat sinks)

Bren R.