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  1. Thread: Beranek's Law

    by toddalin
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    Same here. BTW, I use BBN all the time for...

    Same here.

    BTW, I use BBN all the time for construction noise when I do noise studies for development.
    ...
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    I had 4430s and the L200s with the 2235 woofer,...

    I had 4430s and the L200s with the 2235 woofer, 2420 driver on the long L300 horn and the 2405 slot with custom crossovers.

    The 4430s will easily out image/soundstage the L200/300s. But I didn't...
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    https://cimg7.ibsrv.net/gimg/www.corvetteforum.com...

    https://cimg7.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/1550x1157/80-screenhunter_354_oct_13_13_51_2bdffa27b97a403c413ab0779802e8b5e15a302c.jpg
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    It's taken me 4 years and countless itterations...

    It's taken me 4 years and countless itterations to create a set of crossovers I was happy/satisfied with for my creation that uses JBL 2241H (18"), JBL 2251J (~10"), Great Heil AMT. I used Audyn Q4...
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    Try this..., On the picture of the paperclip....

    Try this...,

    On the picture of the paperclip. "right click" your mouse and select "open image in a new tab" and do so. This is what I have to do to see my pictures when posting JBL Heritage...
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    I have found that the ClarityCaps have a bit...

    I have found that the ClarityCaps have a bit darker sound than some of the others (Audyn Q4, Aerovox) that would probably work well with the titanium driver. They are also fairly cheap on ebay. ...
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    If you point those dead center to the listening...

    If you point those dead center to the listening position, the slight off-axis tilt will do a world of good in removing "beaming" and provide a flatter, more natural (livable) response.
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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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