Adhesive to reattach mw7100 butyl surround

quadzilla

So I had this other thread where I thought I'd blown a driver due to hearing some rattling/buzzing/distortion from one of my LS50s. The good thing is that I ended up meeting Dave, which in and of itself makes it worth it.

But what I happened to find out today, about a month later, is that the problem is actually that the butyl rubber surround has separated from the cone in a few places. So any recommendations on the best adhesive to use to reattach the surround and let me save these drivers? The VCs should be ok, because I played them neither loud nor long once I noticed the problem.

brgman

Henkel Loctite makes a product #1050904 i believe.Look on Amazon.
And let us know how it works if you try it.

luv-my-ls50

Thank you quadzilla for starting this thread. I've pulled the MW7100 driver out of the LS50 again to re-examine the surround. I have GENTLY pushed a narrow screwdriver against the foam from the back of the driver trying to find exactly where and how much the foam has separated from the cone. There seems to be about 1/4 inch of overlap or seam where the surround glues to outside of the cone. Slightly touching the surround while the speaker is playing softly greatly exacerbates the buzz for about 40% of the way around the driver. putting slight pressure against the cone toward the side of the basket away from the 40% area almost completely stops any sound from coming out of the driver when playing softly. Does this mean that I've already suffered voice coil contact with the magnet and that the varnish has been rubbed off the VC and that is the reason the driver stops playing when gentle lateral pressure is applied to the cone?

Thanks, Dana Burkley

luv-my-ls50

I Googled "speaker surround glue" and went to a Klipsch forum. One guy suggested "Weldbond". Another suggested "methyl methacrylate" which is some kind of a specific glue that is meant exclusively for speakers. Most of those guys like silicone. Many have used it and say it works.

silvertuner

i have used weldbond and had good luck. i do not use it for redoing entire surrounds, but in a crunch (and its cheap) and for a quick fix i have used weldbond and it has given me good results everytime

quadzilla

luv-my-ls50 wrote: »

Thank you quadzilla for starting this thread. I've pulled the MW7100 driver out of the LS50 again to re-examine the surround. I have GENTLY pushed a narrow screwdriver against the foam from the back of the driver trying to find exactly where and how much the foam has separated from the cone. There seems to be about 1/4 inch of overlap or seam where the surround glues to outside of the cone. Slightly touching the surround while the speaker is playing softly greatly exacerbates the buzz for about 40% of the way around the driver. putting slight pressure against the cone toward the side of the basket away from the 40% area almost completely stops any sound from coming out of the driver when playing softly. Does this mean that I've already suffered voice coil contact with the magnet and that the varnish has been rubbed off the VC and that is the reason the driver stops playing when gentle lateral pressure is applied to the cone?

Thanks, Dana Burkley

Try gently pushing on the front of the cone near where the surround meets. If you see a gap open up, the surround has separated. If not, then you've got a different problem than I do.

As far as whether you've damaged the VC, it's doubtful. But you can check to see if the VC is shorting by checking with an ohm meter. Both mine read 6.6 ohm. Make sure you disconnect the driver before checking.

ben62670

SuperGlue. Don't use it with foam surrounds.

civilian

Coming from an RC background there is foam safe superglue fwiw.

quadzilla

ben62670 wrote: »

SuperGlue. Don't use it with foam surrounds.

Hmm... you know, I hadn't thought of superglue. I had it in my head that I'd need some sort of special adhesive for a surround due to all the flexing and vibrating. But yeah, they have flexible cyanoacrylate formulas out now.

Tony M

How about that Aileens tacky glue?
I think it works wonders for other speaker surrounds.

quadzilla

Thanks. Never heard of Aileen's. I'll look into it.

gdb

You can buy a tube of butyl caulking compound that when cured, is butyl rubber. Usually used for seams in aluminum rain gutters.

ben62670

I have used super glue for surround and spider repair. It is fine to use the regular stuff. It doesn't really dry that hard, and it drys fast.

Tony M

Sorry, I miss-spelled the name. I just went to a craft store and bought some and noticed the spelling. Here it is. They also had a bunch of other aleene glue that I didn't know they made. I also bought some of their clear thick set glue for anchoring port tubes on an old Pinnacle sub I bought last winter.

http://www.save-on-crafts.com/alortacglu.html