What is the difference between the JBL "2404H-1" and the JBL 2404H ?

[Mr Wizard]

What is the difference between the JBL "2404H-1" and the JBL 2404H, Ultra-High Frequency Transducers ?
The JBL "2404H-1" with the Bi-Radial 62361 Horn is in the JBL 4612OK Loudspeaker.
JBL says 2404H-1 Diaphragm Replacement D8R075 (original) or D16R2405 maybe used.
Did JBL change diaphragms, if so is there a frequency difference?
I can only find a spec sheet on the JBL 2404H, is there a separate spec sheet for JBL "2404H-1".

Thanks,

Mr. Wizard

[speakerdave]

You've more or less stated the difference. It's the diaphragm. JBL used the 075 diaphragms in applications where lower crossover point was needed, as in the 4612.

[1audiohack]

The phase plug is also different, in diameter and angle.

[johanwholst]

Can someone confirm if there are differences in the phasing plug between 2404h and 2404h-1?
I have one 2404h-1 that needs another, but I have been searching for a 2404h-1 without luck.

[1audiohack]

I have measured them and assure you they are.

There are pictures and measurments in a thread calles "Ring Radiator Differences" or something like that. It was started by Widget and has a ton of information in it.

Many of the pictures of parts are in the latter quarter of that thread.

Barry.

[johanwholst]

Thanks for the info Barry! give me a hint if you ever see a single 2404h-1 for sale

[Mr Wizard]

Can someone confirm if there are differences in the phasing plug between 2404h and 2404h-1?
I have one 2404h-1 that needs another, but I have been searching for a 2404h-1 without luck.

If my memory serves me correctly.
They made two kinds of tweeters.
2404H uses the 2405 diaphragm.
2404H-1 uses the 2402 diaphragm for lower crossover-point usage.
I'm not sure of the differences in the phasing plugs between 2404h and 2404h-1.
And I don't know what speaker system they used the "2404H" tweeter in.

The 2404H-1 tweeter was used in the Cabaret 4612B and in the Enclosed Utility system 4612OK.
The 4612B was a road Mini PA sound reinforcement cabinet.
The 4612OK was a oak vinyl covered version of 4612B for fixed installations.
Go HERE for more info on the Introduction of 4612. (Scroll 3/4 they way down on page)

Thanks for the info Barry! give me a hint if you ever see a single 2404h-1 for sale

The best bet to find a 2404H-1 is eBay or Craigslist and look for a 4612B or the 4612OK speaker cabinets.
Sometimes sellers are selling single cabinets.
Sometimes sellers will list them as 2404H and for get the -1.
If you find a 2404H for sale, just ask the seller what cabinet it came out of.
It it came out of 4612B or a 4612OK speaker cabinet then you know it is a 2404H-1.
The number 2404H or 2404H-1 should be labeled on the back of tweeter.

Seller one pair
Seller two pair

[johanwholst]

Thanks for all the great info! I actually bought a pair of beaten up 4612 for the excellent 2118 drivers. But one 2404h-1 was missing.

Its clearly marked 2404h-1 on the magnet, so they are easy to identify for the trained eye

will keep on hunting

[remusr]

I believe you can make a H-1 by installing a 075 or 2402 dia in any 2404. I may have an original H-1 but just moved so everything is boxed up. Somewhere!

[johanwholst]

I believe you can make a H-1 by installing a 075 or 2402 dia in any 2404. I may have an original H-1 but just moved so everything is boxed up. Somewhere!

If you find it and do not need it, please let me know!