what are you on about. 3rd harmonic is less than 20 db down and that's the nasty one !! The funky waves one looks lower and it's not even a servo.
Assuming you can hear 3d order distortion at -20 dB in the relevant ranges, you'd want to use the sub at lower volumes to keep the distortion down. But it seemed to me your initial point was that the servo did nothing, then when presented with evidence that it does indeed do something, you shifted without mentioning it to an implicit attack on the apparent lower degree of control at higher orders.
BTW, I have only done a littel IP law, but Brian's right on. You protect some things with a patent, and others with trade secrets. Depends on the nature of the intellectual property in question (is it patentable, does revealing the tech in a patent application make it too easy for a competitor to design a workaround to compete with you without infringing the patent?) IIRC, you can't patent computer code, but you can copyright it. Can't patent the Coke formula. That has to be a trade secret . . .