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Old 27th October 2011, 09:54 PM   #1
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Unhappy Drivers stored wrong for 15-20 years

Found a pair of drivers that were meant to be used in an old full range speaker kit and having found out the parameters they seem quite nice for a horn sub I've been dreaming of. http://www.seas.no/images/stories/pr..._datasheet.pdf

Anyway they're in really nice condition externally but storage in cold and humid conditions combined with apparently having had the cone pushed in during this storage has resulted in the spider being stuck in a position that isn't in the middle... They move nicely but the travel inwards is much shorter than outwards.
Is there anything I can do? I've been running them for a few hours with a 20hz sine wave on low level but it hasn't made a difference.

-Artturi
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Old 27th October 2011, 10:42 PM   #2
freddi is offline freddi  United States
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could you try weighting the cones from the rear with mortite (if it would stick?) and gently drive them with sine with the cones facing down?
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Old 27th October 2011, 11:18 PM   #3
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An unusual situation, and I don't know how an expert would approach the problem. I'm thinking that low level 20Hz wouldn't be as helpful as just exercising the spider with a higher level music signal, maybe directing steam at the spider before that is done.
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Old 27th October 2011, 11:45 PM   #4
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replace the spider and surround. Steam heating the spider may melt the glue or deform the cone.
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Old 27th October 2011, 11:52 PM   #5
Ron E is offline Ron E  United States
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freddi's suggestion seems reasonable and worth a try before reconing them
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Old 28th October 2011, 12:16 AM   #6
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Mount them in a baffle FACE DOWN and play bass for a couple of hours and see if it helps??
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Old 28th October 2011, 12:54 AM   #7
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A couple volts DC to push the cone in the opposite direction wont hurt the driver, but if you use the exact same corrective force it might take 20 years.
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Old 29th October 2011, 03:09 PM   #8
NEO Dan is offline NEO Dan  United States
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Hair dryer and sine wave while inverted, but gently.
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Old 29th October 2011, 04:20 PM   #9
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Did you ask the manufacturer?
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Old 29th October 2011, 07:27 PM   #10
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First of all, got the link wrong, but they're 25F EW's even though it doesn't make a difference.

I've been driving them with sine and music at decent levels but the spider still returns to an offset location..
I just jammed one driver with a toilet paper roll (carefully) and I don't think it will help on its own but I might as well try giving it some heat. They are virtually unusable in their current state but I have nothing to lose.
I doubt SEAS will have any reconing kits or can help at all because this driver is listed in their "Very old vintage drivers"...

Will report back if I make any progress!
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