[hunter2_]

Similar logic comes into play with mic (noun) and mike (verb). "They miked (or they're miking) the drums with several mics."

We avoid mic (verb) because the "k" works so much better than "c" when leading into various verb endings like -ed and -ing. It's the same reason we add "k" to the word traffic to form words like trafficking; we would interpret the "c" softly ("s" sound) if it was followed by a vowel. But in this case we replace it with "k" instead of adding "k" to maintain the long "i" which would shorten if followed by more than one consonant.

Mic (noun only) is great as a truncation of microphone, though.