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  1. Replies
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    I use a 9 volt as well. It moves big cones enough...

    I use a 9 volt as well. It moves big cones enough that you can clearly see their direction. I doubt keeping it hooked up very long will do any damage to low end drivers, just not enough wattage.
    For...
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    I was reading up about that. Crossovers play a...

    I was reading up about that. Crossovers play a roll in phasing as well as the physical location of the voice coil in relation to other voice coils (in a 2, 3 or more way) system. I use electronic...
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    On compression drivers, if you have red seals on...

    On compression drivers, if you have red seals on the back cover and don't feel like prying them out to do the battery test, what sort of equipment would you use to check phasing / polarity?
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    Did they do this with all their older gear?...

    Did they do this with all their older gear? LE15A, LE8T, 375, LE85, 175, 075, 077, etc.? I'm assuming they had to or their own speakers would be out of phase. I wonder when they made the change and...
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    How to determine proper JBL polarity

    Everything I read (non-JBL) says DC current to a speaker pushes the dome or diaphragm outwards. Yet, when I check a know original JBL driver, I get the opposite. I've heard that JBL often wired...
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    Earl, thank you for your help. I'll run the...

    Earl, thank you for your help. I'll run the 2225H and crossover at 800. The 2225 is good to 1200 and I should not have any issues with my LE85 crossing that high.

    Thanks again,

    Eric
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    Enclosure #34 ...

    Enclosure #34

    http://www.lansingheritage.org/images/jbl/plans/c34/page2.jpg

    http://www.lansingheritage.org/images/jbl/plans/c34/page1.jpg

    My cabinet is a little different in that there is...
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    Thanks. I had not thought about switching out the...

    Thanks. I had not thought about switching out the LE15a for something better suited for the folder horn design. I can certainly do that. It sounds like due to the cabinet design, I'm really limited...
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    LE15a frequency response?

    Anyone know the actual frequency response of the LE15a or have a graph? I will be running the 15a in a folded horn enclosure with an LE85 and an 075. When younger I use to listen to music way too...
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    I think you might be right. After my last post I...

    I think you might be right. After my last post I did a little searching. Not as simple or basic as I was hoping. And, lots of power needed for big speaker magnets.
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    I talked with Dan at Audivex Speakers In Berkeley...

    I talked with Dan at Audivex Speakers In Berkeley CA. I've known him for 30 years. He's been an authorized JBL service center for years and is my go-to guy for anything JBL.

    You were right. Taking...
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    I was reading the other post you were commenting...

    I was reading the other post you were commenting on about the same subject. I have a shop that does all my JBL reconing. It's a one man shop and I've know the guy for 30 plus years, he is very...
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    Excellent video. This was what I wanted to...

    Excellent video. This was what I wanted to address. You took your driver apart very much like I did mine. It seems as though the magnetic force of the 2441 is less than the 375. I needed wedges and...
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    From what I can tell from disassembling the 375...

    From what I can tell from disassembling the 375 is that the only crucial assembly is between the Aluminum Short Ring (2) and the Top Plate (1). This sets the VC gap. The Magnetic Circuit (1) and the...
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    Updated cross-section. Does this look correct to...

    Updated cross-section. Does this look correct to all?

    Thanks,

    Eric M.
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    Thanks, I'll update the photo.

    Thanks,

    I'll update the photo.
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    375 construction / assembly / parts

    I had a 375 with the phase plug sitting high. After reading a few threads here about the dos and don'ts of taking a 375 apart, I decided to tackle it myself. Yes, taking it apart without degaussing...
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    Is that really the case? I just picked up a pair...

    Is that really the case? I just picked up a pair of 375s which I will resell. The paint is in bad shape. Would I be better off just selling as is and not trying to fix up a bit? It's past the point...
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    I got lucky. Took it apart and took a look...

    I got lucky. Took it apart and took a look around. It seemed there was a bad connection from the voice coil copper ribbon wire to the terminal which the internal wiring connect to. I bent a short...
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    Just looked at the beryllium option. Yep, that's...

    Just looked at the beryllium option. Yep, that's out!
    I'll check for bad connections, maybe I'll get lucky. I'll post pictures at that time as well.
    Do you know off hand what the model # is for the...
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    Thanks Dave, I am out of town but will post...

    Thanks Dave,

    I am out of town but will post pictures when I get back. It looks like I will have to replace the pair.
    Which of the diaphragms would you recommend and where is a good place to get...
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    Need Diaphragm for 375 driver

    My 375 diaphragm needs to be replaced. Can anyone tell me where to get an original JBL or aftermarket if original is not available?
    Simply Speakers thinks the 2445J (D16R2445) is the same. Can...
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    Thanks. I think I'll do just that, replace...

    Thanks.

    I think I'll do just that, replace surrounds. I've been looking around the Bay Area for speaker shops. I found one that is authorized by JBL, is it important to make sure they are...
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    Recone or new surrounds??

    I pulled my stash of JBL speakers out of 25 year storage and although all worked and some were brand new, not all did so well. I have attached some pictures. The cones look good and all VCs move...
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    Wow! $200. I can buy another pair on e-Bay .......

    Wow! $200. I can buy another pair on e-Bay .... hopefully from a more honest seller. But that raises the question, how would you know if the unit you are purchasing doesn't already have an...
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