If you insulate your stators well, then there won't be arcing even if the diaphragm hits the stator. For headphones, you really want to use the thinnest spacers you can. In my early days, I used 1 mm spacers and biased them upto 1200V. Nowadays I only use 0.5 mm spacer and bias them at 580V. The thin spacers help a lot with the efficiency. I can play my music as loud as I can take and still the diaphragms are not hitting the stators.
10/26/14 at 4:07am