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  1. Thread: Jbl 2421a

    by Robh3606
    Replies
    2
    Views
    85

    If those are original Aluminum diaphragms I would...

    If those are original Aluminum diaphragms I would be very careful running them to the lower 800Hz minimum. Depends on how hard you are going to play them. Do you know the history of the speakers/...
  2. Thread: KM2

    by Robh3606
    Replies
    313
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    21,815

    I can't do that for you. What horn are you using...

    I can't do that for you. What horn are you using with the Everest cabinets?? What's the LF cutoff, directivity?? Are you going CD or old school?? Are you using the cabinets as intended? Do you have a...
  3. Thread: KM2

    by Robh3606
    Replies
    313
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    21,815

    Making this much harder than it has to be. This...

    Making this much harder than it has to be. This is a very basic and a simple decision. Look for a current driver that meets or exceeds the ancient 2123. You do not need the power handling built into...
  4. Thread: KM2

    by Robh3606
    Replies
    313
    Views
    21,815

    Where is the confusion?? 101dB 2.83v 1 meter 8...

    Where is the confusion?? 101dB 2.83v 1 meter 8 ohm version. That's a standard measurement.

    As far as the VTX 20 those are single elements for an array. There may be a minimum number of elements....
  5. Replies
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    1,262

    Now you went and did it! Seriously I agree it...

    Now you went and did it!

    Seriously I agree it is mostly in your head. However certain speakers seem to excel at it and 2 that come to mind are both the 4430 and M2. In my experience systems that...
  6. Thread: KM2

    by Robh3606
    Replies
    313
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    21,815

    Just don't go full Kabuki on us! It's a...

    Just don't go full Kabuki on us!


    It's a joke search "Kabuki Speakers" if you are not familiar.

    Rob:)
  7. Thread: KM2

    by Robh3606
    Replies
    313
    Views
    21,815

    Got any pictures of the cabinet? Did you get the...

    Got any pictures of the cabinet? Did you get the throats for the compression drivers?? If not you are going to need them to use the cabinets as intended. Guido made throats at one point not sure how...
  8. Replies
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    1,262

    Yes there is. Open your wallet, pull out a $20...

    Yes there is. Open your wallet, pull out a $20 bill and give it a shot.

    Rob:)
  9. Replies
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    1,262

    I second the beer! This gets old constantly...

    I second the beer! This gets old constantly going over the same ground. I don't have an issue with measurements at all considering I couldn't do DIY builds without them.

    The issue I have is why...
  10. Replies
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    1,262

    We have been seeing posts like this for years....

    We have been seeing posts like this for years. You seem to be the one looking for data so go do your null test. And when you get your results you can explain what they mean. Personally I couldn't be...
  11. Replies
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    1,262

    Here we go again! Just try it. ...

    Here we go again! Just try it.

    http://www.audioheritage.org/vbulletin/showthread.php?3555-Bypassed-and-Biased-Capacitors

    Rob:)
  12. Thread: KM2

    by Robh3606
    Replies
    313
    Views
    21,815

    http://www.audioheritage.org/vbulletin/showthread....

    http://www.audioheritage.org/vbulletin/showthread.php?4408-JBL-Technical-Notes-Volume-1-Number-15

    ...
  13. Replies
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    477

    Depending on when those drivers were made it's...

    Depending on when those drivers were made it's entirely possible that JBL didn't source the cones from the original manufacturer. An example would be as spares after the Ti series was out of...
  14. Thread: KM2

    by Robh3606
    Replies
    313
    Views
    21,815

    Hello Anti K You have to decide what you want...

    Hello Anti K

    You have to decide what you want to do, we can't do it for you. Looking at the size of your space you might be better off doing a normal size system to cover a small curtained area...
  15. Thread: KM2

    by Robh3606
    Replies
    313
    Views
    21,815

    Hello Ivica I could not find anything beyond...

    Hello Ivica

    I could not find anything beyond the brochure and the 3rd page of the driver spec is missing in the library. Did you look at what I posted a link too? If you can use them in a system...
  16. Thread: KM2

    by Robh3606
    Replies
    313
    Views
    21,815

    Not really a 2123 could do that all day. It's...

    Not really a 2123 could do that all day. It's 100db 1 watt and can handle 250 watts.

    http://www.audioheritage.org/html/perspectives/drews-clues/2-horns.html

    Rob:)
  17. Thread: KM2

    by Robh3606
    Replies
    313
    Views
    21,815

    Anyone know the internal volume of an Everest...

    Anyone know the internal volume of an Everest cabinet??

    Rob:)
  18. Replies
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    6,439

    Hello Barry You certainly did I was just...

    Hello Barry

    You certainly did I was just responding to Seawolf it for sure is not fixed

    Rob :)
  19. Replies
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    6,439

    Done! Rob :)

    Done!

    Rob :)
  20. Replies
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    6,439

    Meeeeeeeeeeeeeeeeeeeeeeee...

    Meeeeeeeeeeeeeeeeeeeeeeee Toooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo


    RRRRRRRRRRRRooooooooooooooobbbbbbbbbbbbbbbbbbbbbbbbbbbbbb :confused:
  21. Replies
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    33,783

    Sticky: For JBL Pro go here: ...

    For JBL Pro go here:

    https://assets.harman.com/portals/wokfvf2u/JBLProfessionalParts

    And just click on the Asset you are interested in and the Techsheets are there. You can download individuals...
  22. Thread: KM2

    by Robh3606
    Replies
    313
    Views
    21,815

    I have both my passive M2 Horn 2216nd 476Mg...

    I have both my passive M2 Horn 2216nd 476Mg system and my original 4 way mains in my HT system. My 4 way mains are quad amped 2235/E-145/2123 and 2453SL on PTH1010 waveguides. Subjectively they are...
  23. I hope you are not dropping them in the living...

    I hope you are not dropping them in the living room. They are bigger than you think! I was surprised when I saw the boxes and more when I realized they were not much smaller. Sound good though so...
  24. Replies
    4
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    408

    Well you could take a heavy duty garbage bag and...

    Well you could take a heavy duty garbage bag and use packaging peanuts to give you a rough estimate. Just build a guick and dirty 12x12x12 box as your measuring device to give you 1 cubic ft and fill...
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    Just look at the old plans from the 60's ...

    Just look at the old plans from the 60's

    http://www.lansingheritage.org/html/jbl/plans/1960s-manual.htm

    Do you know the internal volume of each side?? If you know the volume use a modern bass...
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