About to re-cone JBL 2225 to 2234/5 need advice

[Earl K]

You're all so helpful. It's not rocket surgery, I guess, so I'll dry fit everything and take a picture of it later today.

What's the length ( height ) of your kit's Kapton former ( that the Voice-Coil is wound onto ) ??

OEM JBL ( from around year 2000 ) was @ 1.25" ( with about 1/8" sticking above the glue-line > of the paper-cone and the former ).

Also, ( in the spirit of sharing ) what's the total weight of that recone kit ( including all parts minus the "Mass-Ring" >> OEM JBL is 137grams, including the mass ring ) ??

Thanks <> EarlK

[turnitdown]

What's the length ( height ) of your kit's Kapton former ( that the Voice-Coil is wound onto ) ??OEM JBL ( from around year 2000 ) was @ 4.25" ( with about 1/8" sticking above the glue-line > of the paper-cone and the former ).Also, ( in the spirit of sharing ) what's the total weight of that recone kit ( including all parts minus the "Mass-Ring" >> OEM JBL is 137grams, including the mass ring ) ??Thanks EarlK

Kapton former is 1.25 inches tall. Weight of all parts minus mass ring is 102 grams. Add the 35 grams mass ring for 137 grams total.

[Earl K]

Thanks for that.

Those kits seem to be real close to OEM JBL then , a good thing.

I notice I had a senior moment and changed a 1.25" measurement into a 4.25" measurement.

I'm going to correct that now.

Thanks!

[turnitdown]

Here, I hope, is a picture with the voice coil in the gap centered with a shim. I dry fit the spider on top of its perch. What's left is about 1/8-3/16 above the spider. This gives plenty of purchase for the cone and cap and it looks as though the coil itself is halfway in/halfway out of the gap. Thoughts?

[Earl K]

Thoughts??

If one looks at my pic of the OEM kit ( posted above ) the "collar" of the spider is pointing towards the voice-coil >> suggesting that you may have your spider flipped upside-down

Rob's pic shows similar ( and is clearer ).

[turnitdown]

The spider is in correctly. What your pictures suggest to me is that I need to put the spider on from the bottom of the voice coil so that the excess spider material folds down toward the coil. I going to try that right now. I'll be back.

[turnitdown]

I flipped the spider over and I now have the look illustrated in those two pictures. The relief of the former above the spider looks right also. If you all agree, I can begin to glue it up. That won't happen tonight however. I have another frame I need to clean and then glue them both up at the same time. I'm ready for a glass of wine. Thoughts on whether it's ready?

[Earl K]

The spider is in correctly. What your pictures suggest to me is that I need to put the spider on from the bottom of the voice coil so that the excess spider material folds down toward the coil. I going to try that right now. I'll be back.

Earl, you were right.
I flipped the spider over and I now have the look illustrated in those two pictures. The relief of the former above the spider looks right also. If you all agree, I can begin to glue it up. That won't happen tonight however. I have another frame I need to clean and then glue them both up at the same time. I'm ready for a glass of wine. Thoughts on whether it's ready?

I missed your most recent post.

Yes, I think you're ready to glue-up ( assuming things are also jiving with the GordonW info that I linked you to ).




PS: I also have here a generic 4" VC spider here ( from at least 20 years ago ) that has a very distinct collar ( it's un-used & the collar is not caused by the direction of application causing loose excess to bunchup ).