The edge of the woofers in both speakers has disintegrated; in one speaker it is totally gone. It's amazing that we didn't notice a significant change in the sound earlier. But a month or so ago I began hearing a "puffing" sound from the left speaker. The first thing I did was remove the front cover and I saw what was causing the problem. The right speaker wasn't as far along in the process but pieces of the woofer fell out of the cabinet when I removed its cover.
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Do you think that I can sell the old woofers on CraigsList?
The other speaker components are small "horns" made of plastic so I assume that they are OK.
Thanks for the info about speaker parts and the forum. After I remove the woofer from one of the speakers I'll see what forum members have to say about the feasibility of replacing the woofers. If it doesn't cost very much they would make nice speakers streaming music from my Mac. I'll have a spare Airport Express when an upgrade arrives this week; all I would need is a basic amp to drive the speakers.