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Old 3rd August 2011, 06:25 PM   #1
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Default jbl gt800 subwoofer sag

Hello, I bought two of these subs on ebay. One of the subwoofers has so much sag it's noteworthy. Check out the pictures. What do you guys think ? Is this even repairable ? I hooked it up and it seems to plays fine but it's xmax is severely limited.

*edit pisspoor packaging and/or fedex handling resulted in the frame being bent out of shape
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Last edited by senate; 3rd August 2011 at 06:30 PM.
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Old 3rd August 2011, 10:44 PM   #2
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You'd have to replace the spider and surrounds. The frame can be bent back. Probably more trouble than they are worth.
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Old 3rd August 2011, 11:16 PM   #3
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yeh the frame is an easy fix. I applied acetone to the spider and fixed the cone in what I thnk is the regular position (probably off by a few mm). Waiting for it to completely dry, but so far it's not reverting to it's broken position. This bay be a stupid question, Can a spider sag perpendicular to the cones motion of travel ?
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Old 4th August 2011, 11:22 PM   #4
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Perpendicular? It's pulling to one side...
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Old 5th August 2011, 01:27 AM   #5
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yeh nevermind it was a stupid question. The Acetone trick seems to work. They are not sagging anymore. Only time will tell if this a long term solution because i suspect the Acetone diluted the resin in the spider a little bit.
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Old 5th August 2011, 01:48 AM   #6
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Hi there: Hope you are storing the drivers in the vertical position. Storage on the drivers back will promote sag. Obviously, stotage on the front will flatten the surround and deflect the cone inward. Hope this works out for you and that you will post longer term conditions. Assuming they survive the treatment, what plans do you have for these drivers? ...regards, Michael
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Old 5th August 2011, 04:37 AM   #7
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thanks for the tip J, I am indeed storign them in the vertical position. I'll update the thread with any long term developments. There is a light noise in sync with excursion on the saggy one, but seems to work fine beside that, probably a tear with the spider. I don't really know anything about these drivers other than they are 4ohm, 93 spl, 35-5khz and 18-200w. I Was looking for a pair of 8"s to throw in a pair of 3-way kenwood cabinets w .55 cubes each, crossed at 800hz 12db. And looking at the t/s of the current JBL gt804 they model okay. pending spider repair
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