As the good doctor himself stated, in a way the B-stock are better than the A-stock because they go through a more stringent battery of tests.
I watched them test out my B-stock VTF3 MKII at the CA headquarters. It was really cool. They make sure the amp is working properly and check for vibrations in the cabinet from 100hz down to like 10hz, 1 hz at a time. It was pretty cool watching the speaker move back and forth so far and not hear anything but still feel bass in a warehouse!
Dr. Hsu stated that when the Subs leave the regular manufacturer that the don't do as many tests on the amp and speaker as he does.
I would not hesitate to buy. The previous owner probably returned because it produced too much bass and they neighbors made him return it.
Of course all this promotion for Hsu, I would really love to hear the EP 500 and 600. They immediately tempted me but am so happy with the Hsu that I will hold off for now.
