Has anyone whose IP2000 is out of warranty opened the unit to look inside? I recently saw a picture of a unit that had been opened and was surprised (as was the owner) to see that the subwoofer has a passive crossover network. I have been unable to find any meaningful specs relating to the crossovers in this system, so it makes me wonder if the HF tweeter is treated in the same way.
If it is a case of the HF driver being passively crossed over, then I feel this could explain the distortion being heard by some. On this and other forums, the distortion heard is often related to when a microphone is being used, and, ok when program music is played. This leads me to conjecture that if a low slope passive crossover is used on the HF tweeter, any microphone plosives will be below the filter cutoff and tweeter operating point, and will get through to the tweeter causing the distortion. On program music there are no such transients.
Now until we get a good look inside one of these units, this is just speculation. So if anyone is prepared to open theirs up and check it out, and maybe put up some pictures of the internals we'll just have to speculate.
It is a pity though, that such a great little unit can be let down by this intermittent inconvenience.