Such a low input impedance on the "High-Z" inputs on an amp designed to be used with amplified acoustic guitars seems like an odd design choice, given that many guitars have passive piezo pickups that wouldn't sound good into an input like that. Are we sure that that's actually the right figure for the input? I can't get clear information poking around on line, but several sources indicate that the high-z inputs have a "bootstrap" design that adapts the impedance to the nature of the signal.
Bottom line: try it first. If it sounds good, it's likely because it's designed to work properly with a signal like the one that comes from a K&K mini. It would be odd if it weren't so designed--although it's possible, I suppose. If it does sound bad, and you don't want to get a different amp, get a preamp or EQ pedal with at least a 1mOhm impedance to buffer the signal. Or a DI box to go into one of the mic inputs.
Louis
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