Berto Aussems wrote in again with another modification to the Zoom H2 recorder:
Listening to soundrecordings made in the 360 degree surround pattern mode of the Zoom H2, I found out that the directional sensitivity is bad. Even the stereo recording sounds mono. The front/back channel separation is the same story. So I had to turn the microphones in 4 times 90 degree. With 2 crossed disk’s on top of the H2, the directional resolution is now much better. Maybe there are other ways to get better results; this is one. I hope to have some discussion with other H2 owners about this theme.
I’m not sure how much further you can push the recording quality of this little field recorder, but it’s promising to see the results of warrantee voiding efforts like these.