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    Boy do I have egg on my face. In the video of...

    Boy do I have egg on my face. In the video of Dire Straits I had just redone the crossovers (for the ??? time) and the Heils were out of phase. This was creating a dip from ~2-5kHz, but they still...
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    OK! I made some revisions to the crossovers on...

    OK! I made some revisions to the crossovers on the Mermans and have produced the best version to date.
    ...
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    I decided that I was loosing a bit too much in...

    I decided that I was loosing a bit too much in the ~200-300 Hz range, so I changed the parallel resistor on the 18" from 26.8 to 36.8 ohms, changed the inductor from 8 to 5 mH, and reduced its cap...
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    This is why I run them as a 2.5 way. Look at...

    This is why I run them as a 2.5 way. Look at that nice low end roll off. There is also an impedience peak at the very low end. When a cap is used in series with the 2251, it does little to protect...
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    A low value resistor in series with the woofer is...

    A low value resistor in series with the woofer is sometimes done and people equate this with a "tube" sound (BTDT). But it has an impact on how the woofer responds in that it hurts the damping,...
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    I use a 50 watt Dale resistor (~20-30 ohms but...

    I use a 50 watt Dale resistor (~20-30 ohms but currently ~27 ohms). 20 ohms seems a bit too little for the 2241 (makes it a bit bass light) and 30 ohms is a bit too much (a bit bass heavy).

    But...
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    Interesting. Note that in this application,...

    Interesting.

    Note that in this application, the 2251J is the smoothest.http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=89457&d=1630248290...
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    And I just finished listening to the JH version. ...

    And I just finished listening to the JH version. My SRV disk is SACD. It is cleaner (revealing a cleaner recording), the transients are much "snappier," and the soundstage and imaging are better. ...
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    It would appear that the phase plug was turned...

    It would appear that the phase plug was turned with the diaphragm in place when the screw was tightened, which left the "twist pattern" in the aluminum.

    When the tweeter is assembled, it is...
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    One can go on YouTube and find a direct recording...

    One can go on YouTube and find a direct recording of the track and compare it to that made of someone's system to hear the fidelity the system to the original as well as the effects of the room. My...
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    I think I have the JH version on CD. I'll have...

    I think I have the JH version on CD. I'll have to record that for comparison.

    A Strat though a Cry Baby should sound like a Strat through a Cry Baby (and usually Marshall) and they have a...
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    Probably wasted space to go much larger. But I...

    Probably wasted space to go much larger. But I do feel a substantial amount of air moving through the port on the rear at lifelike volume levels (1.65" ID x 2.5" long).

    Really captures a Strat...
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    Yes, because the fins can either let the air flow...

    Yes, because the fins can either let the air flow through them on its way to the port, or the air has to flow around them on its way. The fins create "channels".

    Yes same cabinets. The open...
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    Probably not. But I ran them open back, closed...

    Probably not. But I ran them open back, closed back, and with the port and preferred the sound with the port best. Recognze that Wilson "vents" their smaller drivers too.

    Because of the fins on...
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    I simply used an 8" wide x 3/4" thick "shelf"...

    I simply used an 8" wide x 3/4" thick "shelf" board and made a ~11.5" x 11.5" x ~8" deep box adding a face and back from (IIRC) MDF. I also have a rear port made from a PVC coupler, reemed out a...
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    Yes and no. Yes, to turn off a speaker for...

    Yes and no. Yes, to turn off a speaker for testing the others. No, because all of the values in the crossovers are geared for all of the drivers to run at "full tilt boogy." When you turn the...
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    ~6 to 6.5 cu ft interior. Bigger would be better.

    ~6 to 6.5 cu ft interior. Bigger would be better.
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    Don't cross the 2251J over lower than ~300 hz or...

    Don't cross the 2251J over lower than ~300 hz or run them as a 3.5 way. JBL did put it in one of their big 4-way monitors and IIRC use ~290Hz.

    Above ~2K the 2251 will experience a rise in volume...
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    I use 2251Js with 2241H and Heil AMT. I run...

    I use 2251Js with 2241H and Heil AMT.

    I run these as a 2.5 way in that the 2251J has no high pass crossover cap but uses its natural roll off from 300 Hz down. When I did put a 30 mF cap in...
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    One time, I just might have to set up a...

    One time, I just might have to set up a comparison between the L112s and the Mermans. Have never done this.


    https://youtu.be/lDSoidjAClo
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    My L112s have a nice, satisfying "bump" in the...

    My L112s have a nice, satisfying "bump" in the bass. Compared to the 2235s in the L200/300s, they don't go as low. But that "bump" is nice making them seem like they go lower than they actually do...
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    I would not doubt that...

    I would not doubt that removing/cleaning/retorquing the screws could be beneficial, or detremental.

    Anyone who has ever wiggled/loosened/tightened the screw/phase plug on a 2402 and it's family,...
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    Both Long Beach and the Ontario Jam were in their...

    Both Long Beach and the Ontario Jam were in their quad set-up and they ran the music around you. Pink Floyd also used to do this and had a quad set-up for the "Wish You Were Here" tour I saw at the...
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    I was there for that concert as well as the one...

    I was there for that concert as well as the one ELP did at the Long Beach Arena a couple weeks before. Did you spot me in the audience? ;)
  25. Thread: Jbl 2421a

    by toddalin
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    Recognize that the 1kHz crossover frequency was...

    Recognize that the 1kHz crossover frequency was also chosen because that is the point at which the horn and woofer exhibit the same dispersion pattern which helps with imaging.
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