jimbob, iirc radio shack only claimed about 75 or 80 for the minimice, and measurements show them bottoming out (sorry) about 90Hz. I recently augmented mine with a small-but-solid yamaha sub (I had been using a borrowed fisher home hi-fi sub, which helped but not enough), and am now more impressed than ever with the minimice. They sound even better when they are not having to carry deep signals. I set the crossover about 100 - 110Hz. It’s amazing how much difference it makes; my recordings no longer turn to raspberries (American idiom for a farting noise made with the lips) when played over tiny/cheapo speakers!
'til next time;
tw