Summary: This review is for the 6" subs (if such a thing can exist) JBL ES80BK (not the 8" model ES90). I've waited several months since buying a pair of these (one at a time, by accident) before writing a review.
Summary: Running these on a 2-channel Harman Kardan 3390 stereo receiver @ 80WPC. Couldn't be happier with their performance at the insanely low price. Unbelievable these little 6's get so deep, but I also use wall deflection to aid bass response.