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    Really, there's not much odd here about any of...

    Really, there's not much odd here about any of the preceding distortion measurements.

    Your measurement ( at 110db ) indicates over 3% which is in line with the other measurements ( yours is higher...
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    Hi "D" This pic is ( IMHO ) un-necessarily...

    Hi "D"

    This pic is ( IMHO ) un-necessarily cluttered with distortion products that are usually ignored.
    ...
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    Hi Dhar, I have to imagine that those...

    Hi Dhar,

    I have to imagine that those measurements from Dennis were from an earlier generation of large Heils.

    Here's a comparison of Rob's measurements with those of Hobby HiFi ( I slightly...
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    http://www.audioheritage.org/vbulletin/attachment....

    http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=85653&d=1579105329

    Based on extrapolating the following info ( of three different "on & off" axis measurements ) I would guess...
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    Measure your Heil on axis from a foot away using...

    Measure your Heil on axis from a foot away using a test mic with it's calibration file loaded.

    All those caveats/conditions will change the response that you are currently showing.

    :)
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    RobH, Nice! Looks quite natural with that...

    RobH,

    Nice!

    Looks quite natural with that 12".

    Are you going to create a passive network for this ?

    BTW, I've seen a few other references to these large Heils that seem to indicate...
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    This is a recent response measurement ( done by...

    This is a recent response measurement ( done by JavadS. ) of the big Heil ( as a monopole & also as a regular dipole )

    83080

    One can see that ( with very minimal response penalty ) one could...
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    What's needed ( from someone owning those woofers...

    What's needed ( from someone owning those woofers ) is a 1 meter, on-axis response measurement ( of the JBL 123 > black cone ) working in a large enclosure ( say 4cu' ) .

    No custom crossover can...
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    Hi Rob, Have you run any distortion...

    Hi Rob,

    Have you run any distortion measurements on your AMTs to see how low they can go ( before needing to be crossed out to a woofer )?

    Can they do 750-800hz ( with a 3-pole network ) ?

    :)
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    Thanks Rob! :)

    Thanks Rob!

    :)
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    For those who might be interested; Using...

    For those who might be interested;

    Using RobH's Heil files ( downloaded from above ) then traced and turned into .frd + .zma files ( & then the same done to info taken from JBL's 2206H product...
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    Todd, Grumpy merely posted some of the German...

    Todd,

    Grumpy merely posted some of the German to English translation taken from the pdf file that Rob had previously posted.

    Clearly the Google phrase "free placement" twigged a reaction (...
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    Thanks Rob! With my high-school German being...

    Thanks Rob!

    With my high-school German being pretty rusty these days, Google Translate helped fill in the large blanks.

    :)
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    Very Cool! It's great to finally see some pro...

    Very Cool!

    It's great to finally see some pro measurements of these large Heils.

    Woody's broadcast post was exceedingly attractive ( but alas, I need to sell off gear > not buy more ).
    ...
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