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Original Message

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

Posted by neolith on December 3, 2016 at 18:08:21:
I would be suspicious of either a delamination or possibly a loose panel in the frame or crossbar. Does the buzz/vibraiton occur in both channels? and at the same frequency? Usually a buzz from delamination is heard over a range of frequencies. The easiest way to determine delam is to put your ear close to the panel and listen to where the buzz seems to be coming from and then gently push on that spot with your finger and see if you can surpress it.
It is possible that the driver is loose in the frame - it is held in only by staples similar to a picture in a frame. Your MGIIs are ancient and the staples may have worked loose.
If it were me, I would remove the skirts to better examine the drivers. I would leave the skirts off unless you have a WAF problem. New skirts from Magnepan are $30-50 and are made of better material than the original "burlap" material. You should be able to identify visually delamination or a loose driver. Some times the metal bars that run across horizontally work loose as well and these can be glued back to the perforated metal plate with epoxy.