Phenolic 2446?

[Earl K]

Which driver are you interested in?

.036: 375H, 376, 2415H, 2416H, 2416H-1, 2417H, 2440, 2441, 2445H/J, 2446H/J,2447H/J, 2450H/J, 2450SL (74114X), 2451H/J/HPL/H-1, 2490H

.038: 2430HPL (125-30000-01X), 2431H (339894-002X), 2432H (365512-001X),2435HPL, D2430K (446213-001X)


The beloved D2 is on the "Most recent" sheet which is dated October 1st, 2013.

Thanks very much for that!

I don't think any of those newer drivers had their gap widths previously published ( here at LHF ).

[Earl K]

2482 overall diameter 5.45"
2446 overall diameter 4.97"

Earl, the 2446 diaphragm will not fit into the 2482 frame as the alignment pins are set at a different distance. The diaphragms outer dimensions hits the pins and will not let it seat. Its close but no go.

Do the newer ( non-Alnico ) 4"-diaphragmed drivers have those same locating pins for the diaphragms ?

I only own 2440's, 2441's and 2482's which ( as you say ) have diaphragm locating pins which prevent the seating of a 2482 diaphragm into a 2440/2441 body.

If the 2446 doesn't have those pins could one duct-tape a 2482 fram in place ( as a temporary? measure ).

[sguttag]

Thanks very much for that!

I don't think any of those newer drivers had their gap widths previously published ( here at LHF ).

Not a problem. Here is a more complete listing of the compression drivers:

.025: 075 (all), 076, 077, 2403, 2414H-C (5000169X)

.029: LE25 (all), LE20 (all), LE26, 401-132, 035TI,-A, 2412H (125-1000-00X),2412H-1 (339013-001X),

.031: LE85, LE175, 034, 044, 066, 2402,-H, 2404H, H-1(62504-02X), 2405,-H,2410, 2420, 2421, 2425H/J, 2426H/J, 2427H/J, 2460, 2461, 2470

.032: 2406H (337213-001X), 2406H-1 (33721003X), 2407H (339150-001X), 2407J(339150-003X), 2408H (361549-001X), 2408H-1 (365011-001X), 2408J(361549-003X)

.036: 375H, 376, 2415H, 2416H, 2416H-1, 2417H, 2440, 2441, 2445H/J, 2446H/J,2447H/J, 2450H/J, 2450SL (74114X), 2451H/J/HPL/H-1, 2490H

.038: 2430HPL (125-30000-01X), 2431H (339894-002X), 2432H (365512-001X),2435HPL, D2430K (446213-001X)

.039: 2418H (315436-001X), 2418H-1

.040: LE5 (all), 2105, 2105H, 2485J,

.041: 2452H (352328-001X), 2452H-SL (352328-001X)

.043: 375AB, 375FH, 375EX, 375HP, 2480, 2482

[Micke]

Ok. So i have been playing around with the 2446 and a couple of CD horns. Sounds good but a sharp 5k LPF is definitly needed. Easy to fix in "active world" with a LPF and 5K boost to eq the CD roll of. BUT..... I would really like to keep things passive if possible. Ideas for a passive LPF with peaking response? Driver Z is 16R. Im guessing some sort of high order filter. Chebyshev or Cauer, maybe. Any thoughts on the matter are greatly appreciated.

[Micke]

Oh. Just to be clear. Passband ripple doesnt matter here. Might be a good thing, actually.

[ivica]

Ok. So i have been playing around with the 2446 and a couple of CD horns. Sounds good but a sharp 5k LPF is definitly needed. Easy to fix in "active world" with a LPF and 5K boost to eq the CD roll of. BUT..... I would really like to keep things passive if possible. Ideas for a passive LPF with peaking response? Driver Z is 16R. Im guessing some sort of high order filter. Chebyshev or Cauer, maybe. Any thoughts on the matter are greatly appreciated.

Hi Micke,

may be can help, while Z= 12 R driver impedance approximation can be used for LPF at 5kHz

http://www.mh-audio.nl/crossovernetworksforloudspeakers.asp#


http://audiojudgement.com/passive-crossover-schematic-types/


regards
ivica

[Micke]

Hi ivica. Thanks for the links! Very usefull reading.

[more10]

I know where you can get a nice pair in Sweden. They will not be cheap though.

[Rudy Kleimann]

JBL made about 100 2450CM NeO magney drivers that use the 2482 diaphragm. There are some for sale on eBay currently, new and not cheap.

I bought a pair to see what if anything was different besides the bolt circle in a “modern” phenolic driver. I hope to get them apart this weekend.

Barry.

There are some Compact Monitor Systems (CMS Brand) 3-way monitors for sale on the bay right now. The seller states that the 2450CF (F? Typo?) are special-built for CMS by JBL, and that they can be fitted with a standard 2450 diaphragm...

https://www.ebay.com/itm/JBL-Compact...LH_TitleDesc=0

Click on the "See full item description" button...

Barry, can you shed any light on this?

I also identified a pair of odd, wide-flare, round horns I have that fit the ferrite ring radiator magnets as the 2402CM UHF horn/driver used in these CMS triamp systems.
They look like the 2402 horn, but a little longer and with about twice the flare rate. It appears that the "bullet" is different too, but the pictures in the auction aren't good enough to be sure. I don't have the phase plugs, unfortunately.