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Thread: 112/2108 voice coil

  1. #1
    Senior Member bldozier's Avatar
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    112/2108 voice coil

    I read I maybe able to swap a 2122h
    vc into 2108s

    can anyone confirm or deny that.
    Both /.170" at 52 turns

    What about a e110h...
    http://www.audioheritage.org/vbullet...108-Voice-Coil
    Http://www.audioheritage.org/vbullet...2121-2122-2123

  2. #2
    Senior Member Flodstroem's Avatar
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    If its possible (it looks too) where do you find a 2122 vc?
    Flodstroem

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    Senior Member bldozier's Avatar
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    I've seen em Ramon, actually 1. There was a member
    whom bought a few pair a ways back from jbl

    i just saw a pair of 2122h get sold also a few
    weeks ago.

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    Senior Member Flodstroem's Avatar
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    Flodstroem

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    Senior Member bldozier's Avatar
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    *wolf whistle*

    iam am closer but not there yet.

  6. #6
    Senior Member bldozier's Avatar
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    2122h's coil
    Is the same as an 2108.
    Confirmed

  7. #7
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    Maybe instead of taking a voice coil from a valuable and NLA 2122 cone kit, have someone make one up for you - Edgewound (Upland Loudspeaker), or

    Speaker Repair Pros
    10382 Stanford Ave. Ste. J
    Garden Grove CA 92840
    http://www.SpeakerRepairPros.com
    contact@speakerrepairpros.com
    1-714-483-8143 Cell
    1-714-591-5082 Shop

    Both of them have access to aftermarket parts which should be pretty close to the 2122 kit parts, and usually the voice coil assembly is available separately if you ask really nice.
    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

  8. #8
    Senior Member bldozier's Avatar
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    Did you make a reference to aftermarket
    or custom wound kit
    its not very clear

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    Quote Originally Posted by bldozier View Post
    Did you make a reference to aftermarket
    or custom wound kit
    its not very clear
    Aftermarket 2122 kits are built up from parts, including a voice coil assembly wound presumably like the original. These are then glued up to the correct spider and cone assembly. If you want a 2122 type voice coil to experiment with on a 2108 type cone, then check with the above shops, or many of the other vendors across the country who may list 2122 aftermarket parts, recone kits, or recone parts. Someone out there is likely making a 2122 type coil which you can get probably easier than a real 2122 OEM JBL kit, and save that for a real 2122 which itself is pretty rare and used in a few rare monitors like the 4350.
    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

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    Quote Originally Posted by mech986 View Post
    Aftermarket 2122 kits are built up from parts, including a voice coil assembly wound presumably like the original. These are then glued up to the correct spider and cone assembly. If you want a 2122 type voice coil to experiment with on a 2108 type cone, then check with the above shops, or many of the other vendors across the country who may list 2122 aftermarket parts, recone kits, or recone parts. Someone out there is likely making a 2122 type coil which you can get probably easier than a real 2122 OEM JBL kit, and save that for a real 2122 which itself is pretty rare and used in a few rare monitors like the 4350.
    What you Write are correct, BUT finding the correct coil are not easy.

    I have Access to parts directly from MWA, and no edgewound 3" coil With .170" windings are to be found in their catalog.
    Speaker Exchanges aftermarket kit are using a .400" coil and i know they use mostly MWA parts, so i Guess that their Choice of coil
    are the the best alternative of what's aviable. (it would make the driver overhung, and result in a Xmax about +/- 1,6mm (3,2mm total)

    Other vendors like OCS seem too use the same coil in their 2122H kits.

    There are a .170" voice coil aviable from MWA who should fit. BUT its a round wire coil which i doubt would give good results.
    (too thin = low Power handling and force)

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    Thanks for that information. Obviously, not a product that has a lot of demand (the 2108 and 2122 style voice coil). Wonder which voice coil is used in the 2108 aftermarket kits?

    Sort of confirms that some aftermarket kits might not be close to the original specifications, but have whatever is available, or whatever might fit, at least in this case. Still, there might be someone with the correct coil, and old coil or kit, or a used piece out there in someone's shop, storage of inventory.

    I suppose if someone is looking hard enough, a torn cone 2122 with intact voice coil could be a suitable donor assembly.
    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

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    Post

    I have a pair of the original C8R112A cone kits with the ribbed cone. I could crack them open to see if there is a part number on them if that would help.

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    Quote Originally Posted by FE3T View Post
    What you Write are correct, BUT finding the correct coil are not easy.

    I have Access to parts directly from MWA, and no edgewound 3" coil With .170" windings are to be found in their catalog.
    Speaker Exchanges aftermarket kit are using a .400" coil and i know they use mostly MWA parts, so i Guess that their Choice of coil
    are the the best alternative of what's aviable. (it would make the driver overhung, and result in a Xmax about +/- 1,6mm (3,2mm total)

    Other vendors like OCS seem too use the same coil in their 2122H kits.

    There are a .170" voice coil aviable from MWA who should fit. BUT its a round wire coil which i doubt would give good results.
    (too thin = low Power handling and force)
    If its edgewound copper, and the coil is wound starting at the top, wonder if it could be unwound from the bottom to approximately the correct height and turns numbers?

    From this thread: http://www.audioheritage.org/vbullet...108-Voice-Coil

    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

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    Quote Originally Posted by mech986 View Post
    If its edgewound copper, and the coil is wound starting at the top, wonder if it could be unwound from the bottom to approximately the correct height and turns numbers?
    There are a couple of problems with that approach,

    1. The .400 coil in the MWA catalog are intended for the JBL G125-8 and are probably wound with aluminum wire.
    (G125-8 in oem form have a alu coil) http://www.jblpro.com/pub/obsolete/G...And_G135-8.pdf

    2, Unwinding a .400" coil would result in very low DCR (RE in the T/S parameters) , maybe even to low to call the finished product a 4ohm driver.

    3. Unwinding a voice coil include a risk of breaking the bond betwin the windings in other places than you intend.

    This could be promising for unwinding:
    MWA930-16 (3.000 ID) (1.195 FH) (.250 WW)..11.2 DCR
    BUT I don't know if its Alu or copper, and I have no idea if its windings have suitable thickness,
    it might not even be a 3" coil since its not listed together with the other 3" coils (might be a misprint)
    and finally It might not be real edgewound coil but a coil wound in two layers with flat wire laying down instead of on its edge.
    Buy at you own risk

  15. #15
    Senior Member Flodstroem's Avatar
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    How about to use a 2123: 3" coil and make it an overhung midrange? Its 0.420" long, 5.2 ohm minimum and a DCR of approx 4 ohm. But have no idea what X-max then would be
    Flodstroem

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