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RE: Acquired MGIIIA

It's possible that the bass panel wires are delaminating from the mylar. It's a very common problem. The wires are aluminum and tend to corrode over time as well and go open circuit, despite being insulated/coated wire. Try running the palm of your hand up the back side of the panel near the top and bottom, gently. If you feel lifted wires at either end you will know without having to remove the speaker cloth.

If you do remove the cloth, keep in mind that it's got a ton of staples holding it on at the bottom edge and usually removing them is going to cause fabric tears or runs that might make it useless to put back on. Maagnepan doesn't use the burlap fabric anymore so you would be stuck if you decided to try to return them after removing the cloth. Decide if you are willing to keep and rebuild them or have magnepan rebuild them before taking the speaker cloth off of them.

Yes there could also be a tear in the mylar causing a bass note problem. No real way of knowing until the cloth comes off. Whatever is wrong in there can be fixed, it's just a matter of time/expense and whether it needs to be serviced by Magnepan or not.

At what volume do you start to hear bass distortion? Another possibility is the the bass panel mylar has stretched and not taught enough to prevent it from slapping the magnet screen.

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