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ChrisM

12.5 question

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1 hour ago, ChrisM said:

...gallon can of Toluene...

You should be able to find this in quart container - - - not sure about your state, but it's legal here and available in many good hardware stores.

 

toluene 2.jpg

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Thanks ra.ra. It kinda looks like Startex is a East Coast thing. I am in Washington State near Seattle. I can't find any quart cans just the gallon. I could, if necessary, use Xylene which I can get in quarts. Roy said it is OK to use but if I can I'd rather get the real thing. I'll keep looking.

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Inspired by the link Pete B suggested about tweeter renovation, I reached out to Richard So the ADS rebuild god. I am now in contact with him and will report his thoughts on the topic of light weight goop for mid-ranges and 12.5s. More to come.

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Richard said he couldn't sell me his sealant and asked which drivers we were talking about.

I sent him a even more detailed description of the 12.5s and the AD5060s and the fact that we have a most excellent sealant but I have concerns about using it on the little guys.

I said since he is expert at putting sealant on cloth (ADS tweets and mids), I would appreciate any insights he might have.

His response.....

"I have done AR woofer surrounds in the past with cloth surround sealer.
I think you should find the original coating to use on your drivers."

Needless to say somewhat disappointing.

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So I ended up getting an entire gallon of Toluene and thinned out some of Roy's goo. In a non-scientific way, I would say that the result was about half as thick. I have some totally beat up 11 portable speakers which are essentially unrestorable because of the case so I didn't feel bad about harvesting a driver to try the thinned goo on.

It would appear that there is more than one variety of 12.5 which I hadn't realized.

The ones out of the portable have a different surround from the ones in my 11w's. I haven't looked yet at any of my 14's.

The material is cloth with a clearish sealant. The ones from the 11w are more like a gauze with a black sealant. The cloth ones also have a lower Fs.

Any ideas?

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On 9/19/2019 at 11:43 AM, ChrisM said:

So I ended up getting an entire gallon of Toluene and thinned out some of Roy's goo. In a non-scientific way, I would say that the result was about half as thick. I have some totally beat up 11 portable speakers which are essentially unrestorable because of the case so I didn't feel bad about harvesting a driver to try the thinned goo on.

It would appear that there is more than one variety of 12.5 which I hadn't realized.

The ones out of the portable have a different surround from the ones in my 11w's. I haven't looked yet at any of my 14's.

The material is cloth with a clearish sealant. The ones from the 11w are more like a gauze with a black sealant. The cloth ones also have a lower Fs.

Any ideas?

KLH cloth surrounds are generally either brown/tan or black. I believe that the black surrounds were that way from the factory and just had carbon black added to the doping material. RoyC's goop will work on either type. I know 'cuz my KLJ Sixes have brown surrounds and my Twenties have black surrounds.

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True, but my point was about what it is made out of rather than the color. The tweeter in the Model 24 and the 3" fullrange from a Model 8 have similar surrounds to my 12.5s out of the 11 portable. I've looked at a lot of pictures on Google and all the 12.5s appear to have the gauzy surround with black  or clear goop. I would have thought someone else here had seen some like mine.

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