I have posted before on the detached spider in one of my Sub1500 drivers. I imported some Loctite 770 primer and 422 glue and completed the reglue of the spider today. It was detached from the frame about one half of the way around so I glued that back first then after it had dried I attempted to lift the remaining attached portion as I wanted to reglue it. I can tell you the orange glue used has next to zero strength. Running a screwdriver around between the spider fabric and the frame was not an effort at all and the spider just lifts with the brittle orange glue just chipping off in chunks.
I had a L/R pair of Sub1500’s running when it was damaged. I had one spare so I replaced the damaged one until I had the time to look into fixing it. I decided to take out the other driver today to see if it had suffered any damage at all but it had not. I took out the replacement driver and I see that it is starting to detach as well and it has never had anywhere near the same volume of bass through it as the other ones.
So what is the difference? Well the driver that has not failed has clear glue and the two that failed have the orange glue. I made a bit of an attempt to lift the spider on the clear glue one and no-way… I am sure I would tear the fabric before the glue parted.
Failed drivers are J864-05314 and J866-05940. The good one is J864-06001. It would be interesting to see if all 06000 series have the clear glue.