This separation of the cone and spider is not new.
http://www.audioheritage.org/vbullet...hread.php?8281
I understand that the separation issue is not new.
I'm just saying that perhaps your voice coil didn't jump out out the gap until the spider separation occured and that the occurance may have happened within the normal xmax limits. When the spider lets go, there is less tension holding the coil in the gap so it can jump out at less than the speced xmax input.
I've always had the cones slap the magnets with an audible "thunk" before a cone gets far enough out of the gap on AlNiCo JBLs and the W15GTi takes it all in stride without a complaint.
I agree with you and I believe that damage that happened with my 2 sub1500's is a combination of user abuse, intentional or not, and defects in the gluing of the spider.
To recap: in 2005 these went from Idle to max power instantly (can't remember the program type, most likely a sine wave signal) with 1500 watts. Grabbed the sliders on the mixing board as fast as I could and pulled them down. After that I had lots of voice coil rub at low volumes in one of the subs (the one in the pics here). I pulled this speaker out and found that the spider was loose from the basket a bit more that 3/4 the dia.
I glued that spider down and inspected the other sub. The 2nd spider only lifted about 1/4 the dia max.
Reinstalled them and tested. The 1st sub1500 had some minor vc rub (I know, not acceptable!) at higher volumes and the 2nd one had no noise. I figured I didn't get the spider correct on the 1st and decided to live with it until it got worse.
Fast forward to 2010-11 and I got this new Marantz Pro-pre that has a much better subwoofer decoding that my old Yamaha. I was viewing Tron Legacy in Blu-Ray and the Lightcycle scene has some massive sub action. That 1st sub1500 came apart again in that scene.
I pulled it out and that's what you see in those pics of mine. My prior repair hadn't failed.
My other one is failing in the same manner but it hasn't ripped out like the 1st so I got some new super glue and I'm going to try to repair it but ultimately I will recone them as long as I can get the kits.
I gave it a shot this morning on my other Sub-1500. The 1st one has an open-circuit.
Didn't feel like waiting on an order for some Loctite 422 so I went down to a local auto body supply store and picked up a similar product by 3M. I'm going away this week end so I'm not going to be able to test it much. 3M says 12-24 hours for max strength.
I used some Bamboo skewers to hold open the gap, sprayed the primer in, let I sit a little and then used a syringe to apply the Cyanoacrylate adhesive pulling the skewers out as I went around.
The area around the leads separated from the cone and the rest from the spider.
the spider is not torn at all.
In the pic below look in the center of the glue bead and you see a crack in the original glue.
There are many of these cracks in the glue beads on both speakers.
The syringe came from one of those sinus kits for spraying a solution up the nose!
Here's to hoping it holds better than the original
...sure looked like a pure adhesive failure (too brittle for the application?)
Thanks grumpy. Yes it looks very brittle and there's no way I can remove the original adhesive.
I applied the adhesive around 10am and it still hasn't cured and according to this article I quote here, I need to go do some heavy breathing on my speaker!
Originally Posted by http://brainz.org/what-cyanoacrylate-glue/
The SUB1500 I just tried to repair still has issues.
At low volumes there are no problems at all but in extreme LFE sections of movies it sounds like the voice coil (former?) is bottoming out. I've pulled it out and rechecked my glue job and it is holding. I used one section of the movie Tron to set the sub level and I had to back down the level on my Marantz to the max, -12db, and back down the sensitivity on the amp quite a bit to the point where the speaker stops acting up.
So I'm in limp mode...
Anyway, can someone in the repair profession tell me if the kits are are available?
The number is C4RSUB1500
Thanks
Scott
Yes, they are available. You might want to contact Edgewound and see if he'll recone it for you.
Thank you for that info and I would love to use Edgewound but he's a long ways from me so
I was planing on using Daniel at AUDIVEX in Berkeley. He tried to find some info on the kit but couldn't find anything and then I called up JBL Consumer and that was some joke! The guy at JBL had no clue and sounded like he didn't even want to bother to figure out how to get the kit!
The phone techs at JBL Pro are much more smarter and easier to deal with.
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