Planar Speaker Asylum

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RE: Magneplanar MG-II panel vibration problem at low frequency

Posted by viperz on December 3, 2016 at 18:34:54:

The socks are currently off. The tweeter wires have been replaced (along with crossover caps). The banana peels and some spots on the bass panels have been fixed. The Mylar diaphragm panels are solid riveted to the frames.
It's definitely the infamous slap. It happens in both speakers, at exactly the same heavy mid-bass passage. It happens on the bottom parts of panels, where the distance between cross-braces is the largest.
Someone on AK forum posted Magnepan instructions on how to adjust clearance between Mylar diaphragms and magnets, but it's a scary procedure (pushing onto the cross braces "evenly" through the Mylar, essentially bending the magnets away from the diaphragms.
One thing I cannot examine are those cross bars, as the Mylar diaphragms frames are riveted (not stapled) to the speaker frame. Those rivets are very well made, no vibrations or movement.