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  1. Replies
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    There may be some confusion here. The 2216nd was...

    There may be some confusion here. The 2216nd was used in the S4700 and the M2. As opposed to the 2216nd-1 which was used in the 4367. Two vendors in the US include Speaker Exchange in Florida and Pro...
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    I had a similar experience with installing new...

    I had a similar experience with installing new diaphragm on a similar core. The prevailing opinion was that the centering pin eliminated the need for a more careful installation (with adjustments)....
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    The Flex unit is an exciting offering. Do you...

    The Flex unit is an exciting offering. Do you know, or does anyone else know, whether "both sets" of coefficients from POS will work on the Flex unit. The first set is IIR coefficients of standard...
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    Al, Congratulations on getting the drivers. Many...

    Al, Congratulations on getting the drivers. Many years ago, the "version" of the driver meant for use specific use in the M2, would have a sticker on the side that said something to the effect "for...
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    I checked with Pro Sound Solutions. They have...

    I checked with Pro Sound Solutions. They have them comparably priced (actually cheaper since they don't charge for tax and shipping - or at least they did not a year and half ago).

    As far as...
  6. Replies
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    Possible discount on M2 woofers (2216nd)

    I am not sure what to make of this, but Speaker Exchange appears to offering a substantial discount on M2 woofers (2216nd).
    Possibly a 25-30% discount off their usual price.

    The reason I am...
  7. Substitutes for Wrap-On 16550 for cabinet lining ?

    I am in the midst of a DIY JBL M2 build.

    The factory originals are lined on 5 sides with a 1 inch (25mm) blanket (probably fiberglass). The frequency absorption coefficients are unknown and the...
  8. Replies
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    POS, Thank you. This is very helpful. You have...

    POS, Thank you. This is very helpful. You have saved me hours and hours of time. -Thanks again
  9. Replies
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    --------------------------- POS, This is very...

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    POS, This is very old I know ...... but I am also interested in using a small amp and would love to "recover" the -9dB attenuation from the 2-resistor voltage divider. If...
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    This reminds me of the time when I thought I was...

    This reminds me of the time when I thought I was being clever and interposed high shelf and low shelf on a DSP box. No problem with the gain, but the CF in one case was a 3 dB down point and in the...
  11. The only two JBL designs you will find for the...

    The only two JBL designs you will find for the 2216nd woofer are:

    1) (synthesis) S4700 - about 130 liters and port tuning of about 32-ish Hz. Passive Crossover for LF section is published and GT...
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    Before you get too caught up with REW, I would go...

    Before you get too caught up with REW, I would go back and try what was mentioned earlier using tone sweeps and listening.

    My limited experience has been with slightly newer drivers (JBL 2445 &...
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    ----------------------------- That is a very...

    -----------------------------

    That is a very kind and generous offer !
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    Example of a "Banana Curve"

    I hear folks talk about the "Banana Curve" shape (frequency response) when a cabinet / port is set up and tuned.
    However, after searching I have not been able to find an example (image / graph...
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    Bracing

    I am prepping for my eventual M2-style build (modest variations to the factory made versions).

    I noticed on the photos inside the factory versions, the bracing shelves appear to be MDF and about...
  16. Replies
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    I don't have a Hypex DLCP ( I am not even sure...

    I don't have a Hypex DLCP ( I am not even sure what that is).

    However, do you have an RMS Voltmeter (it does not need to be a fancy one)?
    Are you or a friend comfortable measuring the voltage...
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    724,169

    Given the scale on the plot, it looks like those...

    Given the scale on the plot, it looks like those differences are +/- 1dB. That is actually pretty good, perhaps very good. In my experiences small differences measured at the high end can seem to...
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    Two points of clarification. When I was in...

    Two points of clarification.

    When I was in the market for these a couple of years ago I was not diligent in shopping around. This accounts for much of the difference in why I have now revived my...
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    This may be old news to some but it was a...

    This may be old news to some but it was a revelation to me.

    I remember doing the pricing for the major components for "M2-style cabinets" and the price exceeded my threshold (Mr Wallet can be a...
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    Both woofers sound good and were frequently...

    Both woofers sound good and were frequently interchangeable in many systems I have owned and heard the 416s and I like them very much. The 515s I have heard but have not not owned. They sounded even...
  21. --------------- Thanks, I am clear on the models...

    ---------------
    Thanks, I am clear on the models and exit dimensions. I should have proofed what I wrote yesterday.

    You bring up and interesting point about swapping diaphragms. I read a number...
  22. You are correct and I made a cut and paste typo. ...

    You are correct and I made a cut and paste typo.
    Let me set it correctly

    The 2451 is 1.5 inch exit and a 4 inch voice coil.
    The 2450 is 2 inch exit and a 4 inch voice coil.

    I will try and...
  23. No, I am saying the lower frequencies require...

    No, I am saying the lower frequencies require greater excursion. So normally one would use a 2 inch driver (not the 1.5 inch) if you wanted to cross lower. If all other things are equal (seldom...
  24. I had forgotten the phase plugs were similar (at...

    I had forgotten the phase plugs were similar (at least in design). So are you suggesting either diaphragm in the 2446 would perform similarly? Since 1.5 inch horns are usually crossed at a higher...
  25. 2446 with SL diaphragms for 2450 or 2451. Choice?

    I have confused myself again.

    I am using 2446H drivers and would like to experiment with different diaphragms. The Truextent Be diaphragms are too expensive ($950 each).

    However, some you...
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