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    Help Assessing JBL 2421B Diaphragms

    I’m considering buying a pair of JBL 2421B drivers, which I’ve seen (but not heard) in person. I snapped a quick photo of one of the diaphragms, and I wonder if someone could guide me on both...
  2. Thanks! I've seen that chart, but I've never...

    Thanks!

    I've seen that chart, but I've never known precisely how to interpret it. I guess the "Recommended Optimum" of "3.5" cubic feet is in a type "C" enclosure (or "Regular Port Bass Reflex")?...
  3. Cabinet Recommendations for Dual Altec 414s

    I have the four 414s from a pair of Altec Carmels, and I'd like to move them into different cabinets. (The original horizontal Carmel cabinets are too large and unwieldy -- and that's just for...
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    JBL 2441 Throat Diameter

    Apologies in advance for what might be a ridiculously tedious question...

    JBL product literature (http://www.jblpro.com/pub/obsolete/2441.pdf) gives the throat diameter of the 2441 as:

    "49mm...
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    Very, very nice! :applaud: If we lived closer,...

    Very, very nice! :applaud: If we lived closer, *my* Sevilles would be your next project ... LOL!

    I can't quite figure out what's been done to the baffle/port configuration(?) Looks like you...
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    David makes a very good point. Tweeters at knee...

    David makes a very good point. Tweeters at knee level are probably not ideal! I got a similar effect by pulling the horns out altogether, orienting the cabinets vertically, and compensating (very...
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    OMG ... gorgeous! (I admit this response does...

    OMG ... gorgeous!

    (I admit this response does not add a lot to the technical discussion here. :p )
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    I'm fairly certain that GPA isn't out to...

    I'm fairly certain that GPA isn't out to "hoodwink" anyone. They have a pretty impeccable reputation, actually. And most people seem to think that their drivers improve upon Altec originals in just...
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    We missed out on a great opportunity, here ... I...

    We missed out on a great opportunity, here ... I was just down in the DC area (Bethesda, MD) over the weekend with my 45-based SET power amp hoping to hear it with 2397 diffraction horns(!!!)...
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    Did you try the attenuators? LOL! I don't think...

    Did you try the attenuators? LOL! I don't think most people would share this view, BTW. Most people seem to echo the OP ... slowish bass (and not deep enough), maybe due to 2 x 12" woofers per side?...
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    2397 Diffraction Horns?

    Hi folks ... brand new here and have a question.

    I'm on a quest to slowly put together a full-range horn system by converting my Altec Carmels (drivers = 2 x 414Z 12" woofers / 804A 1"...
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