jbl gt800 subwoofer sag

senate · 06:30 PM

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

revboden · 3rd August 2011, 10:44 PM

You'd have to replace the spider and surrounds. The frame can be bent back. Probably more trouble than they are worth.

senate · 3rd August 2011, 11:16 PM

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 ?

revboden · 4th August 2011, 11:22 PM

Perpendicular? It's pulling to one side...

senate · 5th August 2011, 01:27 AM

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.

j.michael droke · 5th August 2011, 01:48 AM

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

senate · 5th August 2011, 04:37 AM

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

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
JBL W15GTi subwoofer for sale	John Sheerin	Swap Meet	3	31st January 2011 08:56 PM
Enclosure for JBL 2226 as a subwoofer?	pumpkin1	Multi-Way	7	15th December 2010 02:04 AM
JBL Powered SubWoofer - Need Schematic	poynton	Subwoofers	7	5th March 2010 11:49 PM
HT JBL PS60 Subwoofer Questions	thefish	Subwoofers	2	1st February 2007 07:35 PM
FS: 2 JBL GT800 8 in Subwoofers	omarmipi	Swap Meet	0	26th September 2006 02:13 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

3rd August 2011, 10:44 PM	#2
revboden diyAudio Member Join Date: Feb 2011	You'd have to replace the spider and surrounds. The frame can be bent back. Probably more trouble than they are worth.

3rd August 2011, 11:16 PM	#3
senate diyAudio Member Join Date: Jul 2011	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 ?

4th August 2011, 11:22 PM	#4
revboden diyAudio Member Join Date: Feb 2011	Perpendicular? It's pulling to one side...

5th August 2011, 01:27 AM	#5
senate diyAudio Member Join Date: Jul 2011	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.

5th August 2011, 01:48 AM	#6
j.michael droke diyAudio Member Join Date: Jan 2009	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

5th August 2011, 04:37 AM	#7
senate diyAudio Member Join Date: Jul 2011	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

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)