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Thread: 1.5" 2431H upgrade: should the 2435 BE diaphragm be the solution?

  1. #16
    Senior Member ivica's Avatar
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    Quote Originally Posted by cooky1257 View Post
    Hi Pos,
    So are you suggesting that all of the throatless/short phase plug drivers(24**) aren't a good match for the M2 horn too? I ask as looking at the pics of that horn it has a very short throat before the pinch/slot section....

    Cooky
    Hi cooky,

    phase plug 'length', and driver internal horn are two different things.
    4" diaphragm drivers such as 2440/41/45/46/50/51 have almost the same phase plug 'length', but 2452 has shorter one. I have no info about 243x types.
    M2 horn has about 4cm long throat, so I believe can be used with JBL 1.5" drivers too (2447,2450sl/51/52)

    regrads
    ivica

  2. #17
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    Quote Originally Posted by ivica View Post
    Hi cooky,

    phase plug 'length', and driver internal horn are two different things.
    4" diaphragm drivers such as 2440/41/45/46/50/51 have almost the same phase plug 'length', but 2452 has shorter one. I have no info about 243x types.
    M2 horn has about 4cm long throat, so I believe can be used with JBL 1.5" drivers too (2447,2450sl/51/52)

    regrads
    ivica
    My intended point was more concerning the 2435 and the 2452's as they are throat-less and feature the shorter phase plug,( the older 2440/41/45 have a cylindrical front throat built in), in the the M2 horn images I've seen I'm not seeing a 4cm throat.......
    The 2435H is finicky as to what wave guides it works with because the phasing plug is so short.- Courtesy of Doug Button



  3. #18
    Senior Member pos's Avatar
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    Quote Originally Posted by cooky1257 View Post
    Hi Pos,
    So are you suggesting that all of the throatless/short phase plug drivers(24**) aren't a good match for the M2 horn too? I ask as looking at the pics of that horn it has a very short throat before the pinch/slot section....

    Cooky
    Hi Cooky

    The "problem" only seem to appear on the 2431/2435, and on some horns (PT and 2332 for example)
    I did not measure any problem on the 2452 and 2450SL cores, so it is not only a matter of being a throatless driver.
    It looks like the snout on the 2432 is an attempt at addressing this problem.

    I plan to measure the 2435 on the M2 waveguide and see if the problem remains.
    So far from the different horns I had the pleasure to try the 2435 on, only the H9800 behave smoothly enough above 10kHz.

  4. #19
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    Quote Originally Posted by pos View Post
    Hi Cooky

    The "problem" only seem to appear on the 2431/2435, and on some horns (PT and 2332 for example)
    I did not measure any problem on the 2452 and 2450SL cores, so it is not only a matter of being a throatless driver.
    It looks like the snout on the 2432 is an attempt at addressing this problem.

    I plan to measure the 2435 on the M2 waveguide and see if the problem remains.
    So far from the different horns I had the pleasure to try the 2435 on, only the H9800 behave smoothly enough above 10kHz.
    Thanks Pos,

    Informative as always, I've been on the forum long enough to witness more than one mad rush for the next great thing-heck I've participated in 2 of them so I'm holding off the expense of another change from H9800 to M2 just yet.

  5. #20
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    And with 2432H Core?

    Hello,
    As it seems that the main problem with 2431H and 2435HPL is the throat with some horns,
    Did someone compared those drivers to the 2432H?
    As pos said, maybe this different core could solve the high frequency problems...?
    If yes, it would be also interresting to compare Al, Ti and Be in this driver
    Didier

  6. #21
    Senior Member pos's Avatar
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    Hi Didier,

    Are you sure the 2435HPL would show this particular problem on your particular horns? (Arai290 3/4 scaled version IIRC?)
    In my tests I found the problem was almost non-existent on the H9800 for example.

  7. #22
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    Hi pos
    Effectively I have no idea of what would happen with the 2435 on this specific horn. Maybe no problem

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