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Konrad, One more thing I'd like to note is that the prototype HE15 sub was tuned to 16.6Hz. Proper tuning is 18-20Hz, but I didn't get a chance to measure it before I sent it out. I literally built the box, screwed in the woofer and PR's and boxed it up. With tuning to the proper frequency...

Bob, Just to let you know, the HE15 that Mark was able to bottom was the prototype with the paper cone that I sent down to him. The same one that TN measured. The SPL at 25Hz was limited by noise from the driver bottoming. The production woofers have an extra 1/2" of clearance, making them...