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Thread: 2435HPL vs. 435Be

  1. #1
    jim henderson
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    2435HPL vs. 435Be

    Does anyone know the differences between the 2435HPL and 435Be? They're both 3" beryllium diaphragms. Are they both 1.5" exit? The cases are obviously different. The 435Be are apparently Aquaplas coated.

  2. #2
    Administrator Mr. Widget's Avatar
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    They both use the same motor and diaphragm, but the civilian version has a larger rear cavity as well as those pretty fins.

    I don't know if the 2435HPL has aquaplas or not. They both use fero fluid and take the same 1.5" horns.

    Widget
    Last edited by Mr. Widget; 04-07-2004 at 09:07 PM.

  3. #3
    RE: Member when? subwoof's Avatar
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    Hey there - I have a pair of the 2435HPL's - no aquaplas, no pretty fins but are 1.5" and damn light...

    sub

  4. #4
    Administrator Mr. Widget's Avatar
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    The 435Be is a shockingly light driver as well. Probably only a tad heavier due to the larger cast aluminum rear chamber.

    Subwoof,

    How do they sound? What horns are you using with them?

    Widget

  5. #5
    RE: Member when? subwoof's Avatar
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    Right now they are stuck on the new 2313's I made ( see other post ) and they are much smoother than the 2421B they replaced.

    Below is a picture.....

    However I am awaiting the 2332's.....gonna retrofit the baffles on the 4345's to allow those ( and the original ) horns to be used.

    When I get them I will try a number of driver / horn combinations and post my observations.

    I have never been a big fan of having short wavelength audio splattered by plastic ( or metal ) plates to create width. This also allows me to make shallow depth grills to minimize the overall cabinet depth.

    sub
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  6. #6
    Senior Member Guido's Avatar
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    Hi Sub!

    Can you provide us with response measurements of the driver? I heard at the music fair in frankfurt that the 2435 needs a strong HF EQ as the Mids are soooo much louder.

    Thanks!

  7. #7
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    Any idea how the 2435HPL compares with the 2430H? Is the only difference the aluminum diaphragm in the 2430H? I'm on the verge of getting a pair of 2430H and the 2332 horns...(gathering all the parts for a custom HT system...).

    John

  8. #8
    RE: Member when? subwoof's Avatar
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    hey there... I have no current way to measure this driver - I have retired ( sold ) all the old analog test gear and will be jumping into the newer DSP based measurement setup when I get a settlement this summer.

    I don't even have a functional RTA at the moment...

    Every time I restore one a customer begs to buy it and *poof* it's gone...

    sub

  9. #9
    jim henderson
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    I'm finally getting my test equipment together. Here's some preliminary measurements:

    http://www.pogeyrealestate.com/perso...asurements.htm

  10. #10
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    So any impressions on what the 2435HPL with the 2332 horn sounds like yet?

    John

  11. #11
    jim henderson
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    So far it appears to be rather harsh, but that's probably a result of my test components:

    Source: computer with M Audio 2496 card
    Ashly 4.24G crossover/EQ
    QSC 502 for the 1400ND
    McCormack DNA 0.5 for the 2435

    My good source equipment is in a rack in another room, so I haven't tried it yet.

    The pulse artifact concerns me, so I'd like to solve that mystery first.
    Last edited by jim henderson; 04-13-2004 at 10:19 AM.

  12. #12
    Dang. Amateur speakerdave's Avatar
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    Originally posted by jim henderson
    So far it appears to be rather harsh . . .

    The pulse artifact concerns me, so I'd like to solve that mystery first.
    Is it possible the pulse artifact is stored energy in the diaphragm surround or back chamber? What about changing the damping to see if that has an effect? (That is, if you dare mess with a diaphragm that would cost $700+ to replace . . . I don't know as I would.)

    I wonder if anyone at JBL would talk about it.

  13. #13
    Dang. Amateur speakerdave's Avatar
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    Widget says, "the civilian version has a larger rear cavity."

    I wonder if the reason is to do something about this echo you've found.

  14. #14
    Alex Lancaster
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    Smile

    Hi:

    It woulnīt be too hard to make a spacer to increase the back chamber volume.

  15. #15
    jim henderson
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    The "echo" comes about 1.4 ms after the pulse response. Does that seem to be too long to be stored energy in the diaphragm surround or back chamber?

    I'll continue to mix and match components and environments this weekend.

    Has anyone taken a 2435 apart? I've never taken a compression driver apart. Would I have to realign the diaphragm?

    I wonder what the back chamber volume difference is and why JBL added volume to the 435Be? Is there damping material in the 435Be back chamber?

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