PDA

View Full Version : Mass Rings



Woody Banks
12-22-2008, 08:23 AM
What are the various weights of the mass rings produced by JBL for a 4" VC?

Hofmannhp
12-22-2008, 09:10 AM
What are the various weights of the mass rings produced by JBL for a 4" VC?

Hi ,
the rings delivered with my two sets of original 8CR2235 cone kits weight about 36 gramms.

HP

Robh3606
12-22-2008, 09:14 AM
Try a search for the 2235, 121A, 2203 and 2231. They all have mass rings somewhere in the posts the weights are there. That is of course unless the JBL Elves happen to read this and just drop it into the thread.

http://www.audioheritage.org/vbulletin/showthread.php?t=2198&highlight=121a


Rob:)

4313B
12-22-2008, 09:39 AM
I posted this back in 2003.

If anyone knows the unknowns we can update it. :D

Guido
12-22-2008, 12:12 PM
The 95 gram ring is NLA right?

4313B
12-22-2008, 01:13 PM
The 95 gram ring is NLA right?Only in the kit now.

Woody Banks
12-22-2008, 02:44 PM
What are the various weights of the mass rings produced by JBL for a 4" VC?

Thanks Guys:

The reason behind the question is that a friend is doing some experiments with the mass rings used on the 2245's. I believe he has access to the 35 gram rings through his reconer and was interested in what else was available.

Woody

4313B
12-22-2008, 03:11 PM
The 2245 didn't use a mass ring. The cone was aquaplased instead.

saeman
12-22-2008, 03:19 PM
Ole Wise And Learned One - your chart shows a 35 gram mass ring for the 135A. It didn't use a mass ring to my knowledge but instead used x grams of white aquaplas coating. Wasn't the 136A and the 2231A the first foam edge woofers to use the mass ring?

4313B
12-22-2008, 03:21 PM
I don't know which driver first used a mass ring. JBL played around with it on several models. Some of the twelves either had mass rings or were aquaplased too. It's possible that the mass ring for the 135A was a JBL misprint. It happens. :p

brutal
12-22-2008, 10:13 PM
I don't know which driver first used a mass ring. JBL played around with it on several models. Some of the twelves either had mass rings or were aquaplased too. It's possible that the mass ring for the 135A was a JBL misprint. It happens. :p

I think there's a lot of misinformation and confusion on the 122A-1 as well. It's been said they either had a mass ring, or Aquaplas, but I had one that, unless improperly reconed at some time in its life, had both the mass ring and what seemed to be a lighter Aquaplas coating on the back. If I can find that mass ring (still on the old cone w/burned VC i think) I'll pull it off and weigh it if anyone's interested. Unfortunately, I can't get an accurate weight on the complete cone assembly as the VC was seriously toasted and got removed and trashed.

The NOS C8R2129H recone kit I picked up had no mass ring and heavier Aquaplas on the back. AFAIK, it was a complete kit.