Are the 3ways designed for free air mounting? If not, then the cones dont have enough damping, and will bounce off the end stop easily, overheating the voice coil and making the speaker grate when you move it...

but the cone deteriation sounds like sun to be honest with you. Is it a foam or rubber surround? Very odd.

Bri

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Brian Drought
1991 300CE
2000 A170-CDI
http://www.users.globalnet.co.uk/~drought/
ICQ: 2180069