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  1. Thread: Harkness C-40

    by grumpy
    Replies
    4
    Views
    161

    I'd be over there, checking them out... they're...

    I'd be over there, checking them out... they're big and old, but if in good shape that's still quite a find.
  2. Replies
    74
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    9,703

    For anyone trying to follow this thread: if a...

    For anyone trying to follow this thread: if a 2225 has its soft parts replaced with a JBL factory 2235H recone kit, it is no longer a 2225, but a proper 2235, unless the mass ring is left out, in...
  3. Replies
    2
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    155

    Unless it has a universal switching supply (AC to...

    Unless it has a universal switching supply (AC to DC) on the other side of that IEC type connector, I'd hesitate to give it the thumbs up. Safer would be a big transformer to drop the voltage (and...
  4. Replies
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    5,337

    Perhaps do a google search on "Zilch Econowave"...

    Perhaps do a google search on "Zilch Econowave" and see what happens :)
  5. Pretty sure something similar could indeed be...

    Pretty sure something similar could indeed be done with a BSS (I believe there's an example of a signal-level based 'loudness' function that does much of that). Trick would be the subharmonic...
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    14
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    604

    Was easier to do finger damage with the original...

    Was easier to do finger damage with the original aluminum dustcaps... which it seems are no longer a feature of the recone kits. :dont-know:
  7. Replies
    37
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    2,091

    https://www.parts-express.com/jbl-sub1500-15-subwo...

    https://www.parts-express.com/jbl-sub1500-15-subwoofer-4-ohm--299-750

    (so, not the same)
  8. Replies
    11
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    456

    I believe that's it. The topic of coupling or...

    I believe that's it. The topic of coupling or uncoupling drivers gets very quickly to: What problem are you attempting to solve?
    You want a good seal. You don't want loose bits vibrating (buzzing),...
  9. Replies
    14
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    1,244

    four minutes + you'll want back: ...

    four minutes + you'll want back:

    https://www.youtube.com/watch?v=tm8FwzHUGCs
  10. Replies
    14
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    1,244

    Hmm... ...

    Hmm...

    https://radianaudio.com/collections/hf-neo/products/951-4-diaphragm-1-4-exit-compression-driver
  11. Thread: 305P MkII

    by grumpy
    Replies
    10
    Views
    1,358

    Nice!... yeah deeper bass would probably just...

    Nice!... yeah deeper bass would probably just muddy the waters (so to speak) re monitor usage, and make for a much bigger box and/or amp.
    I was looking at the intermediate 306 version, but these...
  12. Thread: 305P MkII

    by grumpy
    Replies
    10
    Views
    1,358

    So yes, it breaks into the high 20s low 30s re...

    So yes, it breaks into the high 20s low 30s re usability.
    Drops like a rock below that (expected).
    (pink noise -> iPhone AudioTools LF-range FFT average)

    Could eke out a bit more bass in a...
  13. Thread: 305P MkII

    by grumpy
    Replies
    10
    Views
    1,358

    Let me give it a more serious run through with...

    Let me give it a more serious run through with appropriate source material and get back.
    Itís caused a few surprising room rattles, but no real measurements yet.
  14. Thread: 305P MkII

    by grumpy
    Replies
    10
    Views
    1,358

    Caught a pair of the 8" version on crazy sale and...

    Caught a pair of the 8" version on crazy sale and free shipping at BHphoto with the sub (helps).
    (sale was -very- brief)

    Using as nearfields on stands driven by an old firewire MOTU Traveler...
  15. Other than adding a pair of terminals and...

    Other than adding a pair of terminals and clipping one connection (ok, two connections to prevent blue-smoke-type boo-boos), I'm not seeing this (passive bi-wiring 'mod') as being particularly...
  16. Replies
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    5,337

    Hey!... :D poopers gonna poop.

    Hey!... :D

    poopers gonna poop.
  17. Replies
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    44,655

    Might also look into the later-implemented use of...

    Might also look into the later-implemented use of a diode to rectify the audio signal, thus providing the bias voltage with no need for a battery.
    :cheers:
  18. Replies
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    475

    allowing a mix of driver impedances (a) also...

    allowing a mix of driver impedances

    (a) also switches in/out the 2nd lpf cap to stay in sync with the inductor :) (keeping the 12dB/oct section crossover frequency the same for the alternate...
  19. Thread: Sub18

    by grumpy
    Replies
    28
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    4,196

    :eek: :applaud:

    :eek:

    :applaud:
  20. Replies
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    697

    Many of the parameters are interdependent. If...

    Many of the parameters are interdependent.

    If you want to know about accounting for box volume, RMC pointed you in the right direction.
    ... something like the volume of a cone plus the magnet...
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    My experience? Workmanship is excellent....

    My experience? Workmanship is excellent. Sometimes it takes awhile. Not sure this is a primary gig anymore.
    I expect you'll be pleased with the end result, if not the wait.
  22. Replies
    7
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    697

    -If- the question is re Vd, then itís Sd * Xmax,...

    -If- the question is re Vd, then itís Sd * Xmax, but the intended question may have been answered.
  23. Replies
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    17,841

    I think the answers may lie between room gain and...

    I think the answers may lie between room gain and banana curve discussions.
  24. Replies
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    876

    Haven't directly compared, but I have heard the...

    Haven't directly compared, but I have heard the 1200Fe under a JBL vert horn. It was quite engaging...
  25. Thread: Sub18

    by grumpy
    Replies
    28
    Views
    4,196

    I realize not everyone has suffered from the...

    I realize not everyone has suffered from the decades-long Sit-and-Sleep advert/commercial barrage...
    but “You’re killing me Barry!” :D
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