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  1. Thread: 2309/2310

    by Earl K
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    1
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    58

    Hi Dino, The HF rolloff is really determined...

    Hi Dino,

    The HF rolloff is really determined by the driver ( not the horn ).

    Here's the frequency response of that driver;

    https://usspeaker.com/images/radian-950bepb-freq-size475.gif

    You...
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    Hi Some good 2245H cone info HERE!...

    Hi

    Some good 2245H cone info HERE! , courtesy of subwoof .

    He has always been to go to guy for variations ( of a model ) like this.

    I also know there's more out there ( by subwoof ).

    ...
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    Hi, Your quote is from LHF member "subwoof" (...

    Hi,

    Your quote is from LHF member "subwoof" ( if I remember correctly ).

    If he says it works >> then it works!


    :)
  4. Replies
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    242

    Hi, It's definitively worth checking out ...

    Hi,

    It's definitively worth checking out Jerv's 4425 remake ( thread from 2006 )

    He nicely exposes/lays out the realities of working with the 2214H ( and a 1200 hz crossover point ).

    :)
  5. Thread: 4435 Crossovers

    by Earl K
    Replies
    13
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    3,566

    You might also try contacting MCM_Fan to hire him...

    You might also try contacting MCM_Fan to hire him as a custom builder for some passive networks.
    ...
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    5,486

    ​4430: If your 2235H woofers have original JBL...

    ​4430:
    If your 2235H woofers have original JBL kits installed then you should be getting plenty of bass from your 4430 speaker system ( assuming your woofers voice-coil gaps haven't been gummed up...
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    719

    Thanks but no ( that's not my restoration, I...

    Thanks but no ( that's not my restoration, I believe its from a poster in Belarus ).

    Look through all 133 pics ( pay attention to the pics showing the thread owner drilling out holes for the...
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    Look through the following set of pics for...

    Look through the following set of pics for inspiration ( it shows a complete refurb of a pair of le14c's ).

    https://vk.com/photo-10358368_346007193?rev=1

    8609586096

    :)
  9. Thread: LE175 Question

    by Earl K
    Replies
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    302

    Hey Pete, You can safely ignore the impedance...

    Hey Pete,

    You can safely ignore the impedance labeling from JBL , ( assuming the diaphragms are still original ) they all have the same impedance .

    :)

    EDIT:

    Here's the impedance curve of...
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    konsl, Here's an interesting blog to read (...

    konsl,

    Here's an interesting blog to read ( click the pic ) ;

    https://digilander.libero.it/steveviso/audiogarage/485-M01.jpg

    Of note; the author of the blog was able to find a lot of...
  11. Robert, A couple of things; (1) The blue...

    Robert,

    A couple of things;

    (1) The blue trace; I would expect that both woofers playing together would add level/volume ( not subtract level, as is seen in your pic ).
    - I think one of...
  12. Hi Robert, What are your 4345 clones currently...

    Hi Robert,

    What are your 4345 clones currently tuned to?

    I would first try moving the box tuning upwards ( after verifying what the current tuning is ).

    FYI, boxes tuned too low ( sometimes...
  13. Morten, You posted a pdf indicating the...

    Morten,

    You posted a pdf indicating the measured Re values were/are in the neighborhood of 22 ohms ( post 3 ) .

    This should be a MAJOR red flag that either; those 2245H woofers Voice-Coils are...
  14. `Some advice; You should always include in your...

    `Some advice; You should always include in your first post some proof that you're experienced in making these sort of tests.

    As far as we are left to speculate, you might also simply be a rookie...
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    You have misread + mis-interprested something you...

    You have misread + mis-interprested something you read.

    The "E" series woofers have the same thickness top-plate as a 2225/2235 ( so the depth of the VoiceCoil Gap is the same ) .

    What the...
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    An Educated Guess?? It has the same values as N500C

    In the absence of someone else posting a schematic, my best guess is that it's simply a rotary-switch development that uses the previous model's values ( iow; Altec N-500-C , whose values are mostly...
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    Try...

    Try https://www.manualslib.com/manual/365594/Altec-Lansing-2200-Power-Amplifier.html

    :)
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    16,499

    Really, there's not much odd here about any of...

    Really, there's not much odd here about any of the preceding distortion measurements.

    Your measurement ( at 110db ) indicates over 3% which is in line with the other measurements ( yours is higher...
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    I'll guess that the 2225's flux-stabilizing ring...

    I'll guess that the 2225's flux-stabilizing ring has come loose inside the "well" ( down below the ) voice-coil gap ( circling the pole-piece ).

    The thread ( behind the following pic ) shows the...
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    Hi "D" This pic is ( IMHO ) un-necessarily...

    Hi "D"

    This pic is ( IMHO ) un-necessarily cluttered with distortion products that are usually ignored.
    ...
  21. Derek, What you are wanting to do is called...

    Derek,

    What you are wanting to do is called "Passive Bi-Amping" ( versus Active Bi-Amping ).

    Two amps are still used but Passive Bi-Amping uses the speakers builtin passive crossover components...
  22. Replies
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    16,499

    Hi Dhar, I have to imagine that those...

    Hi Dhar,

    I have to imagine that those measurements from Dennis were from an earlier generation of large Heils.

    Here's a comparison of Rob's measurements with those of Hobby HiFi ( I slightly...
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    16,499

    http://www.audioheritage.org/vbulletin/attachment....

    http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=85653&d=1579105329

    Based on extrapolating the following info ( of three different "on & off" axis measurements ) I would guess...
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    Measure your Heil on axis from a foot away using...

    Measure your Heil on axis from a foot away using a test mic with it's calibration file loaded.

    All those caveats/conditions will change the response that you are currently showing.

    :)
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    Battery Ground is attached to the minus side of...

    Battery Ground is attached to the minus side of the network.

    :)
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