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Thread: 2450 Dia

  1. #31
    Dang. Amateur speakerdave's Avatar
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    Would appreciate if someone who has 4" aquaplased smooth titanium diaphragms would check the DCR. Mine reads 7.7 ohms, which seems high for a nominal 8 ohm voice coil and low for a 16. I'm wondering if it is another case like the 8 and 16 ohm 2405's actually being 10 ohms.

    David

  2. #32
    Senior Member Jakob's Avatar
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    My 2445 dias have a dcr of 8 Ohms, but I don't know for sure if they are H's or J's.

    regards: Jakob

  3. #33
    RE: Member when? subwoof's Avatar
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    paint by numbers

    what is the color of paint on the + terminal?? red=16, green=8

    sub

  4. #34
    Alex Lancaster
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    I have some NIB D8R2450īs that measure 4 ohms, they are ribbed, have a green dot on the terminal, and a small, about 4mm aluminum dot at the top of the dome, they are not SLīs.

    Hope it helps.

  5. #35
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    Quote Originally Posted by speakerdave
    Would appreciate if someone who has 4" aquaplased smooth titanium diaphragms would check the DCR. Mine reads 7.7 ohms, which seems high for a nominal 8 ohm voice coil and low for a 16.
    - My 2 "green-dot" 2450SL diaphragms each measure @ 4 ohms DCR / just like my single 2445H does.
    - This is how it should be for both these diaphragm models .

    - A healthy 2445j diaphragm ( reported to be the basis for the aquaplased D16R2450SL ) is supposed to measure in the range of 6.4 to 7.8 ohms DCR ( according to JBL service literature ).
    - So, your diaphragm is healthy and normal from the info given .
    - They must be coded "red-dot" . Yes / No ?


  6. #36
    Dang. Amateur speakerdave's Avatar
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    Thank you, my friends. Mine is red dot and must be a 16 ohm diaphragm.

    David

  7. #37
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    I have a new in box D16R2450, (not SL), but I'll check the DCR later this afternoon.

    John

  8. #38
    RIP 2011 Zilch's Avatar
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    The DCR of John's new D16R2450 is 7.7 Ohms.

    I'm playing it mounted in his 2446J driver on 2380A horn.

    His other (older, original diaphragm) 2446J here reads 8.2 Ohms.

    I'd like to try these with Aquaplas coated diaphragms.

    2450SL is not available 16 Ohms; no D16R2450SL listed.

    Interestingly, D8R2450SL is the same price as D8R2450 ($174 list).

    D16R2451SL for 2451SLJ is available for $20 more ($194 list).

    Is that what I want? The only coated 16-Ohm option?

    Speakerdave mentioned it above....

  9. #39
    Dang. Amateur speakerdave's Avatar
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    Quote Originally Posted by Zilch
    D16R2451SL for 2451SLJ is available for $20 more ($194 list).

    Is that what I want? The only coated 16-Ohm option?

    Speakerdave mentioned it above....
    My D16R2451SL's are coated, smooth.

  10. #40
    RIP 2011 Zilch's Avatar
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    Thanks, Dave!

    Did you ever install in your 2447J's?

    FR curve the same? (I got MAJOR changes installing D8R275nd in 2426H.)

    And does it confer the desired "smoothness" to the sound?

  11. #41
    Dang. Amateur speakerdave's Avatar
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    Not going in my 2447's anymore. Going into the 2450's. I'm hoping they are going to have a response similar to the 475nd's in the M9500. Now, if I could only get hold of a pair of those H9500's. Hmmmm . . . .

  12. #42
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    Quote Originally Posted by Zilch
    no D16R2450SL listed.
    This one just ended on eBay - too rich for me: http://cgi.ebay.com/JBL-D16R2450SL-R...QQcmdZViewItem

    John

  13. #43
    RIP 2011 Zilch's Avatar
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    Quote Originally Posted by speakerdave
    Not going in my 2447's anymore. Going into the 2450's. I'm hoping they are going to have a response similar to the 475nd's in the M9500. Now, if I could only get hold of a pair of those H9500's.
    I THINK that may be a game I wanna play.

    Keep us posted here, please.

  14. #44
    "new and improved" JBL Dog's Avatar
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    Quote Originally Posted by johnaec
    This one just ended on eBay - too rich for me: http://cgi.ebay.com/JBL-D16R2450SL-R...QQcmdZViewItem

    John
    I have a pair of these if anyone is interested. I can't claim NOS, but they are in very fine shape. DCR measures 7.8 and 8.1. I came across these a while back. They were packaged in open D8R475ND boxes. However, the part number is 61435. That matches the phragm in the auction John has listed.

    $200 delivered to any local in the lower 48. I have several pictures I will post if I can ever figure out this new system. Send a PM if interested.
    This message comes from JBL Dog

  15. #45
    RIP 2011 Zilch's Avatar
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    O.K., dibs on the doggie's dias....

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