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  1. Replies
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    Why are all your driver mock-ups polygonal and...

    Why are all your driver mock-ups polygonal and not round??
  2. Classic compression drivers internal throat geometries

    Hello all,


    After some deliberation, I decided that it would make more sense to start a new thread rather than dig up an old one that had a similar topic.
    I hope this is OK.


    So, basically,...
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    Not the adapter plate per se. But the (potential)...

    Not the adapter plate per se. But the (potential) double mis-match in wall angles may well do so.
  4. Replies
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    Beware. With direct radiating Woofer(s) & a...

    Beware. With direct radiating Woofer(s) & a compression driver+horn, you really need asymmetrical LP and HP electrical slopes (and possibly delay on the HF channel). Make sure that your analogue...
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    That, or add a supertweeter. In my experience,...

    That, or add a supertweeter. In my experience, the latter invariably leads to superior results, no matter what (compared to using compression drivers that "peak" in the top octave - as such peaking...
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    Actually, a 2450SL...

    Actually, a 2450SL + Truextent BeX4008 diaphragm would be the best candidate.

    The 2451 > 2452 > 2453 are progressively cheaper versions of the original 2450s...

    Please note that due to the...
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    YES. But, only once all the caveats discussed...

    YES.

    But, only once all the caveats discussed above regarding crossover and overall system integration have been duly considered.
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    +1

    +1
  9. Replies
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    OK - please do not take it the wrong way, but may...

    OK - please do not take it the wrong way, but may I respectfully ask which large format monitors?
    My suspicion is that the limitation resides mostly with their crossover, and not with their being...
  10. Replies
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    True. Fair enough. But I could also quote...

    True. Fair enough.

    But I could also quote other recordings that lead me to draw the same conclusions.

    For instance, I have a recording of the first movement of Saint-Saens' Symphony n.3 in C...
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    Interesting discussion in the comments section of...

    Interesting discussion in the comments section of that page.

    Mr. Ethan Winer said:
    "Imaging has nothing to do with distance to the front wall unless you have dipole type speakers like Magnepans...
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    Sorry, I don't have time for a complete response...

    Sorry, I don't have time for a complete response to your long post. But I can assure you that this particular assertion is demonstrably wrong.

    For instance, the first track on Roger Waters'...
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    Yes!

    Yes!
  14. Replies
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    FWIW, I found the same. Sitting at the apex of an...

    FWIW, I found the same. Sitting at the apex of an approximately 3-metre side equilateral triangle is the "sweet spot" in speaker-listener positioning.
  15. Replies
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    With all due respect, I think this is an...

    With all due respect, I think this is an unsubstantiated blanket statement.

    What soffit mounting precludes is additional artificial "spaciousness" created by in-room reflections from the front...
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    It has much more to do with their relatively...

    It has much more to do with their relatively crude crossover, which does not pay much if any attention to inter-driver phase tracking.
    The width of the baffle per se is only of secondary relevance,...
  17. Replies
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    I agree on the single driver experience. Good...

    I agree on the single driver experience. Good imaging can be one of the strong points of well-implemented so-called "full range" drivers, especially those without "whizzer" cones, which create all...
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    Yes, this is always true. The importance of...

    Yes, this is always true.


    The importance of equal side wall distance depends on the horizontal directivity of the speakers, especially in the mid range. The higher the directivity, the less...
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    Based on some of the responses in this very...

    Based on some of the responses in this very thread, I doubt we all are (talking about the same thing)...



    100% agreed (bold emphasis mine).

    I would add that a true test for the ability to...
  20. The main reason for the comparatively poor...

    The main reason for the comparatively poor imaging capabilities of many older JBL (and non-JBL) speakers is that their crossovers were relatively crude and paid little to no attention to inter-driver...
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    I have that Revue du Son article. Here's a scan...

    I have that Revue du Son article. Here's a scan of the plans for that horn. It could be a good fit for the 2450SL too, I think.
  22. I know this is a very old thread... but I thought...

    I know this is a very old thread... but I thought I'd chime in on this difference in the internal throats of the 2447 vs 245x drivers.

    Actually, if you ideally add to both drivers the 63mm-long...
  23. New in-room measurements

    ...after a few minor tweaks to the passive crossover.

    76042

    The general trend is now very similar to the one recommended in the JBL synthesis installation manual:

    76043

    Sounds good ;-)
  24. OK, cool thanks. But I don't think I'll embark...

    OK, cool thanks.
    But I don't think I'll embark on any such customization of the Pioneer tweeters any time soon.

    Marco
  25. Hi Ivica, in reply to the points you made: ...

    Hi Ivica,

    in reply to the points you made:

    - yes, of course the JBL and Truextent dias are different, especially in terms of the suspension used;

    - the 2450 driver has a "Coherent Wave"...
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