Results 1 to 14 of 14

Thread: Radian 1245 in jbl 2445

  1. #1
    Senior Member
    Join Date
    Sep 2008
    Location
    Germany / Hamburg
    Posts
    561

    Radian 1245 in jbl 2445

    Hi volks,

    Jbl seems to wire their speakers in a weird manner. Positive connects to black...
    So if i want to replace their diaphragm with a radian, how do i have to connect these?
    There is a red dot on the radians, do i have to connect radian-red to Jbl-black?

    Thanks a lot for your help,
    Olaf

  2. #2
    Senior Member
    Join Date
    Oct 2003
    Location
    Texas
    Posts
    1,724
    It's not all drivers, some are red to positive. The 2445 isn't on the JBL list, but some of the later drivers are, so I'm not sure it's black to positive, anyway.

    http://www.jblpro.com/pub/technote/tn_v1n12b.pdf

    The best thing would be to measure it after installation, just to make sure.

  3. #3
    Senior Member
    Join Date
    Sep 2008
    Location
    Germany / Hamburg
    Posts
    561
    The jbl is black to positive...

    But what is the radian.??

  4. #4
    Senior Member gdmoore28's Avatar
    Join Date
    Jan 2014
    Location
    Arkansas
    Posts
    243
    Quote Originally Posted by Dr.db View Post
    The jbl is black to positive...

    But what is the radian.??
    The Radian drivers are RED to POSITIVE.

  5. #5
    Senior Member Chevelle's Avatar
    Join Date
    Mar 2016
    Location
    Hannover, Germany
    Posts
    175
    Hello Olaf,

    just do a simple test:

    1. connect the diaphragm to the red and black terminals

    2. place the diaphragm into the slot of the poleplate but do NOT fix it with the 8 screws, keep it loose in the slot

    3. connect a 1.5volt battery to the terminals, positive battery to the RED terminal

    4. connect the negative battery very short to the BLACK terminal and watch the diaphragm:
    if it jumps OUT of the poleplate you have connected it the right way,
    if it wants to jump more INTO the poleplate you have to reverse the terminals.

    Good luck

    Hjalmar

  6. #6
    Senior Member Chevelle's Avatar
    Join Date
    Mar 2016
    Location
    Hannover, Germany
    Posts
    175
    Hallo Olaf,

    sehe gerade das du auch in Germany wohnst, hoffe du kannst was mit meiner englischen Erklärung anfangen, sonst auch gerne in Deutsch.....

    Gruß aus Hannover

    Hjalmar

  7. #7
    Senior Member
    Join Date
    Mar 2013
    Location
    Indy
    Posts
    128
    One other thing I have learned over the years is that when determining polarity of unknown compression drivers and you do not have them apart because the work great, place a fine tape like packing tape, over the exit (good idea anytime they are off the horns, anyway) and then do the battery procedure. The light tape will still move slightly, enough to see or feel.

  8. #8
    Senior Member
    Join Date
    Sep 2008
    Location
    Germany / Hamburg
    Posts
    561
    Hi,

    thanks a lot for your help!

    I knew the battery test, but I have only used this with woofers so far. I was afraid it would hurt a compressionsdriver....

    But anyway, the Radians are red to positive. So they have to be reversed when installed in the jbl´s.

    Radian red to jbl black.

  9. #9
    Senior Member Chevelle's Avatar
    Join Date
    Mar 2016
    Location
    Hannover, Germany
    Posts
    175
    My Radian dias 1225 for the 2420/21 are NOT positiv on red. Radian says that their replacement dias for JBL drivers have the same red mark as the original so it is easier to change. So the red mark on Radian is the same as red mark on JBL. The Altec replacment dias from Radian are of course positiv on red.

    Hjalmar

  10. #10
    Senior Member Chevelle's Avatar
    Join Date
    Mar 2016
    Location
    Hannover, Germany
    Posts
    175
    You can read it here:

    http://www.parts-express.com/pedocs/...ions-44925.pdf

    "...with the same polarity as the original"

  11. #11
    Senior Member gdmoore28's Avatar
    Join Date
    Jan 2014
    Location
    Arkansas
    Posts
    243
    My error for not reading your original post closely enough. I thought you were referring to a Radian DRIVER rather than a diaphragm. Thanks to the others for catching my mistake.

    GeeDeeEmm

  12. #12
    Senior Member
    Join Date
    Sep 2008
    Location
    Germany / Hamburg
    Posts
    561
    Thanks a lot for that very important notice!!

    So I believe the 1,5v batterie test remais the only true test.

    But it realy doesn`t hurt the diaphragms
    I thought this was only possible with woofers, as the cone movement could be way to much for the compression-drivers!?

  13. #13
    Senior Member Chevelle's Avatar
    Join Date
    Mar 2016
    Location
    Hannover, Germany
    Posts
    175
    I have phase tester with sender and receiver so I check every driver after changing the diaphragm for correct phase. I do it every time to be sure. I never had a Radian diaphragm for JBL drivers that was positiv on red, always negative same as original dias.

    As long as you take a 1.5 volt battery and only connect it very short to the terminals to hear that "clic" sound and watch it move it does not hurt the diaphragm. I did that hundred times.

    Hjalmar

  14. #14
    Senior Member
    Join Date
    Sep 2008
    Location
    Germany / Hamburg
    Posts
    561
    Quote Originally Posted by Chevelle View Post
    As long as you take a 1.5 volt battery and only connect it very short to the terminals to hear that "clic" sound and watch it move it does not hurt the diaphragm. I did that hundred times.

    Hjalmar
    Allright, I´ll do that.

    Thanks a lot!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 2445 Ti dia vs Radian 1245-16
    By martin2395 in forum Lansing Product DIY Forum
    Replies: 13
    Last Post: 11-06-2014, 01:48 AM
  2. RADIAN VS JBL drivers
    By Bruno GINARD in forum Lansing Product General Information
    Replies: 2
    Last Post: 02-15-2010, 04:54 AM
  3. Radian diaphragm for 2445
    By music2me2 in forum Lansing Product DIY Forum
    Replies: 16
    Last Post: 02-01-2010, 05:27 PM
  4. Radian diaphragms?
    By oznob in forum General Audio Discussion
    Replies: 8
    Last Post: 03-27-2008, 05:31 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •