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    To your advantage? :skeptical: Possibly lower...

    To your advantage? :skeptical:

    Possibly lower resale value (not original and had some work done).
    The bipolar electrolytic (blue) doesnt appear to be bulging or oozing from the ends.
    Do you...
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    Worth making sure the 50+ year old drivers are...

    Worth making sure the 50+ year old drivers are still functioning properly.
    It would not be surprising if the HF drivers (diaphragms in particular) were not.
    Connections to, and inside the...
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    Depending on the thickness needed to match the...

    Depending on the thickness needed to match the correct exit/entrance angles, you might get away with an extra gasket and some modeling clay in the gap. You'll have to measure/calculate that unless...
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    ... warning #2, the speaker to RCA level...

    ... warning #2, the speaker to RCA level converter mentioned is probably a resistive voltage divider, so wiring the two converter outputs in parallel (which is what would happen using a Y-adapter),...
  5. Thread: Interesting...

    by grumpy
    Replies
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    8,157

    Good ol Albus DumbleGore. A true tech wizard....

    Good ol Albus DumbleGore. A true tech wizard.
    Nice that the spooks are on vacation or busy elsewhere.
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    Very nice. I had completely forgotten that...

    Very nice. I had completely forgotten that someone had the wherewithal to mount that challenge... and successfully.
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    Lots of TBDs in there... ;) ... and I think...

    Lots of TBDs in there... ;)

    ... and I think Ian is working on producing something a bit more turnkey than a schematic, unless I have my wires crossed.
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    Nice. Given the bouncy ball in pic one, you might...

    Nice. Given the bouncy ball in pic one, you might want to attempt to protect those grilles and sharp corners...
    As clean as those are, little accumulated bits of unfortunate damage could pull down...
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    Keeping in mind my handle here is 'grumpy'... ...

    Keeping in mind my handle here is 'grumpy'...

    I would think other questions to ponder (particularly this being your first post, asking for a notional appraisal) might be: are you (and perhaps...
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    I would suggest leaving the inductors alone, in...

    I would suggest leaving the inductors alone, in general. Many networks are dependent on the resistance of a particular inductor to work properly (as intended). Also, they don't tend to deteriorate.
    ...
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    Maybe try this: ...

    Maybe try this:

    https://reconingspeakers.com/product/jbl-033-034-aftermarket-diaphragm/
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    Is there a way to get at the voicecoil (wire...

    Is there a way to get at the voicecoil (wire under the dome on a 1" short cylindrical former) without unwinding too much?
    Soldering the back to the wires still hanging on the mounting frame is going...
  13. Yes. But if you're using a passive crossover, it...

    Yes. But if you're using a passive crossover, it would need to be modified and levels possibly adjusted.
    With an electronic crossover/biamp system, it should be much less of an issue.
  14. Doh. I glossed over the J suffix. Sorry about...

    Doh. I glossed over the J suffix. Sorry about that.
    Wondered about the direct terminal connection... as both pictures looked identical.
    IIRC, the old screws and connecting wires work fine with...
  15. One potential vendor (no association): ...

    One potential vendor (no association):

    https://reconingspeakers.com/product/jbl-d8r2450sl-diaphragm/

    likely out of stock due to the sale price.

    Don't recall the difference (would think...
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    :banana:

    :banana:
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    Cool. Hope the web support equals the pro phone...

    Cool. Hope the web support equals the pro phone line and you get some useful suggestions! :)
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    Agree with Rob, but why would JBL not have...

    Agree with Rob, but why would JBL not have real-world experience ... in setting up studios for critical listening (for example)?
    It's OK to use customer service also ... this is current equipment...
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    Have you tried talking to JBL directly?

    Have you tried talking to JBL directly?
  20. Thread: LE5-12 Polarity

    by grumpy
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    515

    ... and no, it will not harm the driver to try,...

    ... and no, it will not harm the driver to try, but it is by design:

    87656
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    The dome under the flashed aluminum (or aluminum...

    The dome under the flashed aluminum (or aluminum paint) is thin, but hard phenolic. If the dents didn't recover right away, the underlying material has been compromised (fibers broken). They can be...
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    Sure looking nice! :thmbsup:

    Sure looking nice! :thmbsup:
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    1) might want to pay attention to the DC...

    1) might want to pay attention to the DC resistance of the inductors (e.g. 1.1 ohms vs .36 for an ERSE iron core also at Parts Express).
    For some crossovers, this makes a significant...
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    Ah. Perhaps there were two completely separate...

    Ah. Perhaps there were two completely separate Altec system 15 lines, if so, “my bad.”

    The one I was referring to is a -not- an instrument cabinet and it would be entirely inappropriate to use as...
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    Apples and Oranges. Youll likely blow the...

    Apples and Oranges.

    Youll likely blow the woofer (not an instrument driver), and a fairly expensive compression driver.
    I get wanting a smaller bass cab. This is 75lbs though and a studio...
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