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Not a clue. I think I remember reading something about Kenrick using a black dye to freshen up old cones, not sure if anybody figured out what it was or how it was applied.

Horns designed for D2 or 476 drivers have 1.5 inch throats.

Maybe JBL ears decided the supertweeter was too hot in the 20K range and engineered the dip?

If the supertweeter response has a hole at 20K where nobody can even hear it - does it matter other than graphs?

You can buy a replacement 128H spider, no idea how it stacks up against the PR300 spider but at least it'll have some life - might have to adjust the weights to get it to play nice with the woofer
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I spy another XTA user...

Bo did a little how to on a speaker surround, might get you started

http://www.audioheritage.org/vbulletin/showthread.php?469-Resurround-Step-by-step

I just like the low gloss glow it imparts - not shiny, doesn't change the tone, just looks right. I've done 3 applications, leaving it on up to overnight before buffing it off (it was a fresh...

Here's the article, FWIW (the author posts as badman here)

http://www.enjoythemusic.com/diy/0311/supertweeter.htm

I think it was badman who did some testing of dome tweeters in small waveguides, so I mounted a ScanSpeak 9700 into a little 1" Parts Express waveguide. Holy smokes, that thing came alive - way too...

Glad it worked out! They make 12v trigger power strips, but not sure if they'd be up to powering an amp. I use one to trigger my DSP, but it draws nowhere near what an amp does.

That re-foam looks good to me - the dust cap looks ... different. But that shouldn't make any difference in the bass department.

If you can find them, that's another driver with likely no support from JBL. Fostex makes some nice tweeters, if I was in the market I think I'd look at some of their higher-end offerings. At least...

As you can imagine, we have more than a few folks pop in from time to time to question the validity of the charge coupled crossover. Most have no intention of ever building one, but it drives them...

Just save yourself the trouble and forget they even exist - simple!

I'd advise jumping on in there and building something! These threads can go on and on, competing opinions weighing in on various aspects - but you seem to have a decent grasp of what you're after. If...

I meant the new 2235 in context of a pro 15" being deployed in good numbers. The other 14 and 15 inch drivers you mention - are they readily available for purchase new and have replacement part...

Unless you have a source for these esoteric drivers like the 476Be and any of the 1500/01/AL/AL-1 etc, I'd use what's more commonly available. The 2216Nd is the 2235 of today, they are used in...

I've owned L220a before, they had plenty of bass well below 100Hz, there's something out of whack with yours if they aren't producing any. Not sure what the problem is (out of polarity woofer wiring...

D8R2450SL or D16R2451SL

They are calling the 16 ohm version discontinued, not sure if that's official or not.

...and why anybody contemplating a build from new-ish JBL should invest in a backup set of parts. Last time I looked, even things like 2405 diaphragms were NLA, JBL has evidently quit supporting a...

You'd also be getting new voice coils, cones, baskets, magnets, and hopefully still serviceable spiders. I imagine those cone kits are scarce and I bet they wouldn't be much cheaper than the cost ea...

I did some work in a refinery in Texas City some years back, had some great food in a little hole in the wall restaurant down town and went out on the pier or jetty or whatever. Seems like guys were...

That's the oil, this is the wax

Ah, YouTube - I thought it was meant that AK was blocking.