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In Reply to: RE: Magneplanar MG-II panel vibration problem at low frequency posted by viperz on December 03, 2016 at 15:07:43
Well, Carver was a no go, so I brought my Dynaco MKIII pair. Same thing.
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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.
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. .
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