JL Audio Fathom f212v2 powered subwoofer & CR-1 crossover
It was familiar because the same thing had happened when Kal reviewed the original Fathom f113 in his May 2007 column. As he would again nine years later, he'd extolled the sub's high power, small size, built-in single-band Automatic Room Optimization (ARO) software, and "remarkably powerful and clean" deep bass. Those were also my reactions to the Fathom f113.