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

    Perhaps do a google search on "Zilch Econowave" and see what happens :)
  4. 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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    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:
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    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)
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    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),...
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    four minutes + you'll want back: ...

    four minutes + you'll want back:

    https://www.youtube.com/watch?v=tm8FwzHUGCs
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    Hmm... ...

    Hmm...

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

    by grumpy
    Replies
    10
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    1,293

    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...
  11. Thread: 305P MkII

    by grumpy
    Replies
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    1,293

    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...
  12. Thread: 305P MkII

    by grumpy
    Replies
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    1,293

    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.
    It’s caused a few surprising room rattles, but no real measurements yet.
  13. Thread: 305P MkII

    by grumpy
    Replies
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    1,293

    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...
  14. 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...
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    Hey!... :D poopers gonna poop.

    Hey!... :D

    poopers gonna poop.
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    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:
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    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...
  18. Thread: Sub18

    by grumpy
    Replies
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    :eek: :applaud:

    :eek:

    :applaud:
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    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.
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    -If- the question is re Vd, then it’s Sd * Xmax,...

    -If- the question is re Vd, then it’s Sd * Xmax, but the intended question may have been answered.
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    I think the answers may lie between room gain and...

    I think the answers may lie between room gain and banana curve discussions.
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    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...
  24. Thread: Sub18

    by grumpy
    Replies
    28
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    4,105

    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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    Hi Todd, Karlson boxes look kind of cool and...

    Hi Todd,

    Karlson boxes look kind of cool and are fun to contemplate, and certainly have an effect.

    I'll speculate that at 30Hz to 300Hz a triangle cut out would be fairly equivalent... or a...
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