JBL 2404H Diaphragm , possible alternative

waynebaker

waynebaker

New Member
If you are familiar with this diaphragm, you probably know that it also fits a Peavey HT-94. So if I were to purchase a Peavey OEM diaphragm, would the quality be closer or as good as the OEM JBL or closer to the cheap aftermarket diaphragms that are all over ebay? Any thoughts are appriciated.
 
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I have a pair of JBL 4612's with one bad tweeter and want to make them to match. I can only assume the good one has the original dia
Jeffery said:
What is the goal?
Click to expand...

I have a pair of JBL 4612's with one bad tweeter and want to make them to match. I can only assume the good one has the original diaphragm.
 
The 4612 has a 2404H-1 in it, which is basically a 2404 with a 2402 (075) diaphragm in it (I think there are very slight differences in the phase plugs, also, but not 100% on that). They did that so the diaphragm could survive the unusually low crossover point in that design - assuming it was used in a touring or installed application. Used in a home, you could likely get by with the D16R2405.

The El cheapo aftermarkets are pitiful, based on the reports of others who bought them and couldn't understand why their tweeters sounded awful. That's why I asked about the goal. If it's to get them making sound to sell, use the El cheapos. If it's to listen to them, get JBL - they've recently had a significant price reduction. No experience with Peavey, and I've never heard of anybody using them.

I own 4612OKs FWIW.

http://reconingspeakers.com/product/jbl-2405-d16r2405-diaphragm/
 
Jeffery said:
The 4612 has a 2404H-1 in it, which is basically a 2404 with a 2402 (075) diaphragm in it (I think there are very slight differences in the phase plugs, also, but not 100% on that). They did that so the diaphragm could survive the unusually low crossover point in that design - assuming it was used in a touring or installed application. Used in a home, you could likely get by with the D16R2405.

The El cheapo aftermarkets are pitiful, based on the reports of others who bought them and couldn't understand why their tweeters sounded awful. That's why I asked about the goal. If it's to get them making sound to sell, use the El cheapos. If it's to listen to them, get JBL - they've recently had a significant price reduction. No experience with Peavey, and I've never heard of anybody using them.

I own 4612OKs FWIW.

http://reconingspeakers.com/product/jbl-2405-d16r2405-diaphragm/
Click to expand...
Thanks, mine are oak also. Obviously I was asking because I don't want to pay nearly $200 for a diapragm. I found a Peavey under $50. I appriciate your advice!
 
Look at the bright side, it's only a little more than $150 :)

And to add... that diaphragm I linked to is what I'd personally use in a home situation - it won't be the same as what should be in the 2404H-1. So if you used it, you'd really want to do both. If you used the 2402 part, you might get by with just changing one, but who knows what the condition of the surviving diaphragm is. And I have no idea what the Peavey part is close to.

There comes a time when the restoration and upkeep of JBL speakers runs into the "damn this got expensive quick" or "oh well, they aren't really JBL anymore" fork in the road.
 
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I have used the HT-94 diaphragms in 2404s- they do seem to work well.

The HT-94 diaphragm in a 2404 body "sounds" like sort of a "middle ground" between the 2404H (with the 2405/077 "lightweight" diaphragm) and the 2404H-1 (with the 2402/075 "heavy" diaphragm). It's probably a very good choice for a 4612.

BTW- even though the 4612 SAYS it has a 3KHz crossover- the electrical crossover frequency (what the crossover itself "does" without the driver- modeling the coil and cap value) is 5000 Hz. It's only with the "horn gain" of the 2404, that it plays down to 3KHz. So, the HT94 diaphragm won't be in too much danger, unless you just pound on it

Regards,
Gordon.
 
In some cases, on eBay you can possibly win a complete and functional 2404H tweeter for less than the price of a new diaphragm, and occasionally I've come across a complete pair of 4612's, regular black or oak, for the same $200 price. So there's that option if you're not in a hurry.
 
djnagle said:
I use the Radian diaphragm with Mylar surrounds. Much smoother vocals...
To my ear.
Click to expand...
Yes, but radian only makes replacement diaphragms for JBL compression drivers, unfortunately not for the ring radiators like the JBL 075 / 2402, 077 / 2405, and 2404.
 
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