Planar Speaker Asylum

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Original Message

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

Posted by Satie on December 5, 2016 at 09:33:48:
Reading further into your description of the refurb project I suspect your bolting of the frame to the MDF may have flattened the curvature of the magnet board so the 1st thing to check is if the problem disappears when you detach the panels from the frame and float them instead - with staples or screws (driven sideways into the frame) to hold them in place. For similar results to direct bolting to the frame in damping the frame-panel interface use rails to push the panels into the frame and an elastic material in between the rail and the steel driver frame. Then bolt the rails to the MDF.

Bending them while they are bolted to the MDF frame will not work because the bolted structure will not bend permanently and may harm the MDF with the rivets digging into it and possibly cracking it. .