For those who don't want to wade through the long threads, there was a lot of debate about those tests, specifically whether the measurements were at all relevent to real world performance. The main point was that the testing approach Ilkka used focused on single notes which caused the DSP logic to kick in and take the output levels way down, resulting in an artificially low output. I'm guessing there is some hum protection code in there, but not sure.
The other concern was that the graphs were misleading, in the sense that they focused on distortion in frequency ranges below the enclosure's cutoff where actual sound output was very low. The discussions got very ugly and a number of threads were deleted by the moderators.
The PB10 is a really nice subwoofer but it would not be a substitute for an EP600 in a real world listening situation. Ilkka tended to ignore (and even bypass) the DSP circuitry which is the heart of the EP600, and he didn't like the resulting performance
