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  1. 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...
  5. Thread: Sub18

    by grumpy
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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 itís Sd * Xmax,...

    -If- the question is re Vd, then itís 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...
  11. Thread: Sub18

    by grumpy
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    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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    Visual differentiaion? Horn a smidgen closer to...

    Visual differentiaion? Horn a smidgen closer to the top woofer? Worked -way- better than 180ļ around either other major axis.
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    Perhaps a unit with training wheels (clipping...

    Perhaps a unit with training wheels (clipping indicators), or better yet, suggest going biamp so the bass amp (overdriven or not) can’t wreak havoc on the more sensitive drivers... use the integrated...
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    -very- loud bass -might- let you remain in the...

    -very- loud bass -might- let you remain in the room with 300w peaks, but it would be uncomfortable unless outside or in a very large room. So, I would not see 150w as a real-life L300 limitation....
  16. Thread: JBL Paragon

    by grumpy
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    Condolences and congratulations. Perhaps a...

    Condolences and congratulations.

    Perhaps a Mcintosh 2x05 type amplifier and an accompanying pre would suit the mood/period (?)

    Modern gear is certainly suitable as well, but somehow wouldn't...
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    -opinion- Not where I'd personally go for a...

    -opinion-

    Not where I'd personally go for a daily listener (14" woofer crossing over to a small paper tweeter is bound to have its limitations),
    but they are old with fewer and fewer of them in...
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    "...but this voltage needs to be higher than any...

    "...but this voltage needs to be higher than any expected signal peak voltage."

    I challenge this repeated assumption. I suggest the bias voltage only needs to be sufficient to mitigate low level...
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    If you just pick the correct two terminals on an...

    If you just pick the correct two terminals on an 8ohm L-pad, you'll have a variable resistor (low ohms to ~40ohms)
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    Xmax for 128H is only 1/3" ... 2" is right out. ...

    Xmax for 128H is only 1/3" ... 2" is right out.

    I would guess 1) simply expecting too much and over driving the system or 2) the box tuning (passive radiator in this case... seems there was a...
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    If it's already tuned to be ~30Hz (say 5-6ft3...

    If it's already tuned to be ~30Hz (say 5-6ft3 vol, 4" long x 4" diameter port), I'd just start with it as-is (running through some scenarios).

    I would expect that to be fairly close to neutral (no...
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    Very nice. Inspirational, in fact. I -really-...

    Very nice. Inspirational, in fact.

    I -really- need to make working space in the garage and get going before George comes and kicks my butt!
  23. Poll: If the popping is happening with vinyl as a...

    If the popping is happening with vinyl as a source, use a high pass filter (whether its called a rumble filter or infrasonic filter)... the L150 is capable of enough LF energy to feedback through the...
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    More opinion: the 076 diaphragm is likely worth...

    More opinion: the 076 diaphragm is likely worth much more than the 044Ti (I am quite familiar with both drivers). Very much worth the trouble of trying to get what you paid for.
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    Opinions: I'd wait to see what the seller says...

    Opinions:

    I'd wait to see what the seller says before doing anything.

    Other than the box, there's perhaps only a bit more value in the "new" Ti diaphragm than there would be for a very clean,...
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