[Geoff Gunnell]

I seem to be more sensitive to IM distortion than many people, judging by my negative reation to what is to me obvious IM distortion in some flat panel speakers that doesn't bother others. So I am especially curious about your IM tests..

I assume there was no obvious audible difference between the best and worst performers on this test. IM is hard to hear on test tones and you were testing the subs one at a time.

I've read at least some of the discussion prior to the test selecting frequencies etc. Did you learn anything in these tests that would improve IM test methodology?

Do you have any clues as to the causes of IM in the worst performers? Put another way, have you learned anything yet that sub designers should do differently doing to reduce IM?