Sticky midrange cone's Seas 10 F-M

[boyofwax]

I have a pair of Seas 10 F-M from 1977 to reuse in a project. The cones appear to be factory coated and are sticky. Has the coating failed and are these toast? Or just use as is? Why were the cone's coated anyway? Have a pair of Marantz that also have sticky mid's.

 

[jayme]

If the surrounds are ok, give them a shot. Several modern driver cones like Scanspeak Revelators are tacky.

 

[adason]

I have a pair of Seas 10 F-M from 1977 to reuse in a project. The cones appear to be factory coated and are sticky. Has the coating failed and are these toast? Or just use as is? Why were the cone's coated anyway? Have a pair of Marantz that also have sticky mid's.

Measure fr response and distortion, compare to the seas datasheet. If it performs well, who cares how it feels. You are not supposed to touch the cone with your fatty fingers anyway.

Many mid domes have sticky coating. But i am not familiar with seas 10 f-m.

 

[Dave R]

The sticky coating on the 10F-M is a special damping material. (spec sheet attached)
It's a nice little midrange. I have used it a couple of times, most recently in the 3-ways shown.
Good idea to measure it.

 

[boswald]

An oldie, but goodie.
Uncoated they were used as high power tweeters in PA systems.
The coated ones are excellent mids, small excursion so crossed fairly high, 500hs for low power, 800-1k for higher spl.
10F & 11F were made for many years.