Magnepan DWM problem

Just got off the phone with Wendell Diller at Magnepan. I was hearing a rattle/distortion/resonance from my DWM Bass panel in my nearly new MMG Super system. With particularly strong bass notes (Cut Chemist-The Audience's Listening CD-track 2 & 3)at a robust (but not as loud as I might one day choose) volume.The problem only occurs with this type of bass note at this very healthy volume. I was concerned that my panel was defective or that my 110 watt Odyssey Khartago monoblocks were clipping. What Wendell told me was a bit surprising-he stated that this is pretty much a problem with all Maggies!! Apparently the film was slapping against the magnet(if I recall correctly)-I was more than a little shocked. I could not recall in the research I did before purchase or the good deal of Maggie related research that I did since the purchase(or the 2 local Maggie owners I know) did I ever hear this issue mentioned. It is certainly possible that this shortcoming has been mentioned in the literature and perhaps every speaker may have a similar problem but I am still a bit unsure. So please weigh in with your opinions and experience. Can a true Audiophile quality speaker have such an issue? Was Wendell just trying to get me off the phone? Should I be worried about an issue that will not reoccur in 99% of my listening? Many thanks. LS