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    JBL C-38 Grill Cloth Options

    My C-38s have the standard brownish-red-with gold threading and I'm looking into other options.

    I've seen some JBLs with black fish fabric and a gold abstract drizzle all over. I'm having...
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    That was my leaning as well. I'll see if I can...

    That was my leaning as well. I'll see if I can find anything about phase plug differences.
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    Help Identify JBL Drivers

    Does anyone know what model these are?

    I'm thinking 2445s because of the diaphragm.

    They came out of an organ installation but no tags or stamps.
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    JBL Crossover Cutout Template

    Hey guys -

    I've done a bit of searching but have not been successful.

    Does anyone have a pdf of the JBL crossover (n1200 & many others) cutout template?

    thanks!
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    okay good to know!

    okay good to know!
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    This is what I will be attempting. I've...

    This is what I will be attempting.

    I've ordered some Jantzens, L-Pads and Dayton Resistors!


    thank you all thus far.
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    Thanks for your help speakerdave and Wagner. I...

    Thanks for your help speakerdave and Wagner.

    I definitely realize the 130a would shine in a different cabinet - larger and/or horn loaded.

    My intent is to optimize the cabinet so the 130a can...
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    To achieve 20 square inches, I need a 5" circle...

    To achieve 20 square inches, I need a 5" circle or 2"x10" rectangle, correct?
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    Alrighty, been doing some reading! From this...

    Alrighty, been doing some reading!

    From this page:

    http://www.lansingheritage.org/images/jbl/plans/1960s-manual/page11.jpg

    it says I should have a 20 Square Inch port with a 5" tunnel.

    If...
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    Thank you guys for all the insight so far! ...

    Thank you guys for all the insight so far!

    another question:

    Does anyone know what the proper vent size, port size, and/or port tube length for a C-38 cabinet with a 130a?

    In this picture...
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    Thanks for the response Thomas! I am asking...

    Thanks for the response Thomas!

    I am asking for both types, yes. Really I'm just trying to find out what I should do if I mount a 2405 in the cabinet (which covers up the only vent in the cabinet)
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    I've been looking for C34 and C35 cabinets. no...

    I've been looking for C34 and C35 cabinets. no luck yet - I've always loved the C34 cabinets. Tubes are on the list as well - I just wish I hadn't sold my 2A3 SET a few years ago. It just didn't play...
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    no time to respond fully to everything that has...

    no time to respond fully to everything that has been said -

    but I thought I should insert some actual photos of my system instead of the stock photos in the first post.
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    Also - Maybe this thread would be better suited...

    Also - Maybe this thread would be better suited in DIY.

    If so, Moderators, could you please move it? thank you!
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    here is my current plan of attack (per toddalin's...

    here is my current plan of attack (per toddalin's advise over on AK):

    "Add a 1 or 1.5 mfd cap in series with the 2405 and an L-pad on the 175 and also put a 20 ohm, 10 watt resistor in parallel...
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    3-Way JBL C-38's

    Hey guys -

    I have been listening to my JBL C-38s for the past few weeks, and have been LOVING them.

    They have the 001 load (130a, 175, n1200). They have a midrange that is simply gorgeous and...
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    Are these Genuine JBL Diaphrahms 2403/076

    Would someone be able to tell via this picture whether these diaphragms are genuine?

    These are on a pair of 2403s
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    Here's my current setup: D140-R 375...

    Here's my current setup:

    D140-R
    375 w/Edgarhorns
    2403

    driven by a JE Labs 2a3 through a Jolida Tube DAC

    61589
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    Switching the polarity on the 375 made a world of...

    Switching the polarity on the 375 made a world of difference! Thank you!


    This got me wondering:

    Is there a way to test each driver to find out which terminal is positive and which terminal is...
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    I'll give that a shot. thanks! By this, do...

    I'll give that a shot. thanks!



    By this, do you mean reversing the polarity on the 375? on the d140r? on both? thanks!



    I have switched to 400hz EdgarHorns. Thank you for the...
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    Thanks for your reply! i have attenuated the...

    Thanks for your reply!

    i have attenuated the 375 and 2403 quite a bit. I'll do some more experimenting with that tonight.

    Let me clarify: the frequency range I feel that I'm missing is the...
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    recommendations?

    Hey guys-
    my current system includes:

    32ohm d140r
    16ohm 375
    16ohm 2403

    i had a crossover built by a gentleman in California.

    he said the crossover was designed at 800hz/7000hz with 12dB...
  23. Thread: JBL 3-Ways

    by cjwebber
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    I've been chewin' on this 500 vs 800. I think I...

    I've been chewin' on this 500 vs 800. I think I may have to go to 800.
    should've consulted the forum instead just my own thoughts :blink:

    I've sent an email to the guy who made the crossovers...
  24. Thread: JBL 3-Ways

    by cjwebber
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    IPAs are my favorite :) The more hops the better...

    IPAs are my favorite :) The more hops the better for me!
  25. Thread: JBL 3-Ways

    by cjwebber
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    Thank you. I had a gentleman in California design...

    Thank you. I had a gentleman in California design and build them for me. A friend of a friend.

    Diabolical IPA by North Peak
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