Need guidance on repair / recone of JBL 2245H woofers.

[Ohighway]

I was thinking the OP was considering doing the recone himself

Yes that is correct.

 

[donprice]

https://reconekits.com/jbl2245h8ohmreconekit.aspx

I used that kit on a recone a few years ago for my brother. The cone was not coated with Aquaplas or similar. So I added Duratex to the rear of the cone and faked it the best I could by adding multiple coats and measuring the cone weight after it dried. It worked out just fine for a budget-friendly effort which was a priority in this case.

 

[elitopus]

The 2242 woofers I had reconed have MWA kits. They do not have aquaplas. I think Gordon added weight some other way.

You’d have to call around and see if any of the aftermarket kits are coated.

The link I posted from McKenzie are most likely MWA kits.

 

[grey]

So here's a look at what I have. Magnets look centered. Cones themselves look good however I see no alpha/numeric markings anywhere on cones. Both voice coils look scraped and at least one has a broken wire. Surrounds and spiders are shot.

I'm wondering if a pre-assembled cone, voice coil, spider, surround assembly might be the best way to go here?[/ATTACH]

Those cones look suspicious and I have a few pics of oem vs. a slightly different suspect. The facing side is very close, but the aquaplas on the back is noticeably different. It would be interesting to attempt repair on my strange example, but cone is wasted.

Ken offers two different assembled kits:
JBL 2245H True Reproduction Recone Kit w/Aquaplas From Upland Loudspeaker

Recone Kit for JBL 2245. Newly Developed "2246H" No-Rot, Cloth Surround for 2245

 

[Jeffery]

I'd be surprised if there are any actual JBL 2245 cone kits out there, seems like they announced that they were quitting production of them years ago. As soon as it was announced, I sent a pair to Upland to get them refreshed and that's been a while now.

But as the OP wants to do the job himself, and JBL doesn't sell cone kits to the public (even if they still had any), looks like rolling the dice on an aftermarket kit is about the only shot. If Upland sells his kits without installation, those are far and away what I'd get.

 

[elitopus]

Sure, once you recone with an aftermarket kit the woofer isn’t really a 2245 anymore, but that doesn’t mean it sounds bad. The MWA kits sound great IMO.

 

[Ohighway]

Those cones look suspicious and I have a few pics of oem vs. a slightly different suspect. The facing side is very close, but the aquaplas on the back is noticeably different. It would be interesting to attempt repair on my strange example, but cone is wasted.

Ken offers two different assembled kits:
JBL 2245H True Reproduction Recone Kit w/Aquaplas From Upland Loudspeaker

Recone Kit for JBL 2245. Newly Developed "2246H" No-Rot, Cloth Surround for 2245

Who is Ken ?
....

 

[grey]

Upland Loudspeaker Service in California. Goes by "edgewound" here and on the Audio Heritage forums. Found those kits on the auction site.

 

[tarior]

Haven't experienced any limits in the 15-years I've had mine. And you don't hear about this issue in the original iMax system where perhaps a dozen of these were used as the subs in immersive theater installations such as the Smithsonian Air and Space museum. I have no first-hand experience with overdriving them but would love to hear something more detailed beyond overdriven with "and old Crown amp". I've used mine on DC300A-II and PS-400 where their original owner used Haflers.

He might be lacking the steep 26Hz high pass. You'll find a limit to the 2245 real quick without it.

 

[BMWCCA]

He might be lacking the steep 26Hz high pass. You'll find a limit to the 2245 real quick without it.

So am I, since I use them in the JBL 4345 which crosses them around 290Hz, by design.
I'm fond of quoting the designer of so many iconic JBL systems:
". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers.

 

[tarior]

Lack of amplifier power could also be to blame. It's almost impossible to have too much headroom with something like a B460/4645.