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JBL 128H rear "gasket'?

B

Balaszi

New Member
Does anyone know what to call this part of the speaker that actually touches the cabinet? I'd like to replace it if possible.

It seems like some sorth of weather stripping gasket that creates a seal with the cabinet when installed. I'm currently in the process of re-foaming my L112's for the first time myself, and noticed these things are in pretty bad shape....Also ripped out a good chunk from the cabinets when the woofers were removed...so this re-foam is now turning into a cabinet restoration also!

Any advice would be greatly appreciated.

Thanks!IMG_3431.jpgIMG_3432.jpgIMG_3433.jpg
 
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Hello Balaszi the part you are referring to is a neoprene gasket or called a noodle gasket. The L112 being of many years old has gone through a couple of reconing or refoaming practices. From your pictures the last person that did said procedure got some of the contact adhesive on the frame by the gasket. It was then reset in the baffle face without the glue fully cured and some contact adhesives always stay kind of tacky. This is why the baffle lost some of its material. The other looks like someone had a blade under the basket to lift it up for removal. To fix this I would use the very slightest amount of silicone on it to glue it back together before doing my refoam and making sure it is fully dried before resetting. Also with some 90% isopropyl alcohol I would clean all that glue off the outer back rim. Some people buy a one sided adhesive cork gasket and do the perimeter of the opening. The gasket does not look that bad if you get the slice or split back together.
 
Thanks, much appreciate the tips. Is there a way to replace these 100%? Some of the gasket is missing by where it is cut.
 
Any gasket material will work functionally as long as it seals the airflow. I used Mortite rope caulk in a number of speakers to good effect.

The original at least for the 122A in my L166 was a large and thin O ring, maybe 11 3/8” x 1/16”? Check McMaster Carr or similar sites after measurimg for the right diameter.
 
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