JaimeG,
Yes, as Sir Quack has noted, the code is custom digital code that Ian Colquhoun and Tom Cumberland write for the DSP chip in the EP800. The code controls driver excursion, anticipates and corrects for any frequency response deviation away from ideal linearity, and because it's programmed with the maximum output capability of the digital amplifier and the maximum excursion of the two drivers, it "knows" when distortion might become audible and limits the upper output and driver excursion so distortion never rises so high as to be audible.
The "intelligent" DSP chips are in Axiom's EP400, EP500, EP600 and EP800 subwoofers. An original custom code has to be written for each different model.
Regards,
