That's the thing; were it the speaker or the terminals, I would expect one of the other amps to have an issue with it as well, especially one of the more mass-market amps.
The only thing I can come up with is either the amp is unhappy with capacitance in that particular run of cable, or there's something up with the speaker terminals or speaker that that amp is sensitive to and that cheaper amps work around (e.g. If this amp is direct coupled and the others have bypass caps.)
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