Planar Speaker Asylum

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

Posted by Satie on December 3, 2016 at 21:07:07:
then you must have low clearance as the magnet boards must have been flattened from the magnet side at some point. Looks like the bending procedure is probably necessary. Alternately use a pair of subwoofers crossed over around the 80hz. Just check that that is just above the freq where your slap occurs. .

The small tube amps don't have the damping capacity but also don't have enough voltage to displace the diaphragm far enough to induce slap in a normal "healthy" speaker. The 1.5t should have had enough current to damp the slap in a normal MG2.