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  1. Replies
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    obsolete

    I kinda like that monikor..:)

    the 2245's mag assy was scaled larger ( the deeper 2220 top plate and thicker E series 7/8 magnet ) but the coil assy would fit ( and is used in the 136HS woofer...
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    3,838

    physics

    smaller cones have ( usually ) lower mass therefore greater acceleration compared to larger cones when used on the same size amplifier ( with it's defined output impedance / geometry ).. think...
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    1,874

    plug

    they are cemented in place and carefully aligned at the factory.

    that much rust is fatal - not worth repairing anymore.
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    1,912

    color

    gold is the later color - back then all the "rings" were natural aluminum.

    They look correct but the picture(s) are very poor..

    sub
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    3,527

    compare

    Have a pair of 6230's on the bench right now - one is fine, the other is in fault
    ( even though the amp section is just fine ).

    Will let you know what I find.
    sub
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    Ac / dc

    measuring across the white wires gives you the AC voltage - when rectified and filtered it becomes 24Vdc

    measuring from the red to green is across BOTH sides of the rectified main DC voltage ( 50...
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    caps, revisited

    if you don't have DC on the output terminals, and the light slowly comes back on, then a cap must be involved somehow. replace the 22 and 100 caps ( C35, C13 ) on the DC detector circuit. measure the...
  8. Thread: 4333 help

    by subwoof
    Replies
    23
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    7,081

    *sigh*

    Ivica: Without delving into your response: I said (often) it makes NO difference what the *slope* is - if the distance from the driver exit to the eventual mouth is short, the crossover must be...
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    olive drab...

    Have owned a number of the olive-drab painted "bullets" in the last 30 years. Here in the concrete slab north east they were common on some highway intersections ( and temp construction of bridge...
  10. Thread: 4333 help

    by subwoof
    Replies
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    7,081

    laws of physics

    But you cannot change the laws of physics - shorter horns mean higher crossover points...period.

    Does not matter the size / material of diaphram, type magnet, color of paint or whatever slope the...
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    relay cap

    On the ckt board near the relay there is a electrolytic cap that goes bad with age ( HEAT ).

    The engineers at urei used a 1/2 wave rectifier to create the 24v needed for the relay but it's murder...
  12. Thread: 4333 help

    by subwoof
    Replies
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    7,081

    short answer

    using the 2311 and larger driver is of no help.

    The length of that combination is SHORTER than the 2312
    so no advantage for LF extension is realized.

    Please use the search function and read...
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    Wintertime blues project

    813DS
    (made up model)

    Since all the parts are just sitting in the shop / storage maybe I'll
    assemble and test to see how they sound this weekend when it
    GASP goes above freezing...and hire a...
  14. Thread: 2312 options

    by subwoof
    Replies
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    2,593

    early versions

    The first gen "studio monitors" used the 4502 cabinet, the 3110 ( 800hz ) crossover and the 2307/2308 horn lens with the venerable 2420 driver. The original woofer wwas a variant of the theater 15 -...
  15. cabinet

    That cabinet ( 4722 ) and all of it's variants just didn't work for any project no matter the woofer / horn / driver combo.

    Impossible to get any decent bass and yes - the "suck" happens with any...
  16. Replies
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    3,778

    soldering

    Unfortunately you need special aluminum solder/flux to repair those - it used to be available from JBL BUT somebody deemed it possibly harmful to left handed gerbils or migrating hummingbirds...
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    1,660

    opened

    The very very very first gen "D" series woofers had a narrower gap which was changed early on so not that many of them "need" this no-longer-available factory modification..and has nothing to do with...
  18. Replies
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    shifty

    be careful - had a few of those mags come through the shop shifted..:(
  19. Thread: Jbl 2480

    by subwoof
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    2,674

    copper

    4" coil PHENOLIC diaphram...able to go much lower in response than Al or Ti at the expense of the high end due to heavier moving mass.

    The 2480 ( 375HP / Dukane 5P360) had a copper voice coil like...
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    2403

    I bought ( and sold stupid cheap alas ) 40 2403's ( pro 076 ) from a texas SR company many years ago - one thing that stood out was that the diaphrams had the silver outside aluminum gasket but it...
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    gap

    The only reasoning I can think of is that both the E145 and 2215 share the same VERY deep magnetic gap depth with short voice coil - maximum linearity but at additional cost of the oversized magnetic...
  22. Thread: 2405H question

    by subwoof
    Replies
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    3,817

    33752

    33752 is the correct JBL internal part number.

    If not aligned, you will always be able to hear a low frequency artifact and/or lower output.

    Above 18Khz you need to use the canine method.
    ...
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    helper woof

    The helper woofer in the last gen 813C that came through the shop was the 2234HPL ( no foilcal, rubber tire ) while the coax was the E145 with the 2425HS ( again without foilcal, tire ).

    A local...
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    guide holes

    chances are that "tech" is younger than the speakers and doesn't know any of the old tricks.

    75% of ALL the older alnico drivers that use the guide pins have to have the matching holes on the dia...
  25. IPA's owed

    When I do my west coast roadtrip next summer I'll look you up and obtain IPA's as payment..:)

    SKOL
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