Page 1 of 19 12311 ... LastLast
Results 1 to 15 of 278

Thread: Ring Radiator Comparisons

  1. #1
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,934

    Ring Radiator Comparisons

    This thread will show the on and off axis response of all four of JBL's ring radiator tweeters. There seems to be some confusion over these so here is a mini background. All four tweeters can use the same diaphragms and have the same motor structure. There is an alnico and ferrite version. After having measured several of each tweeter in both motor types I am certain that there is a fair amount of unit to unit variation, but not due to magnet type.

    The first model of this series was the 075 "Bullet Tweeter". There is also the Pro variant the 2402 and the ferrite version, the 2402H. This model has a the heaviest diaphragm of the three and is capable of operating over the widest frequency range. It also has the most focused dispersion pattern.

    The next model offered was the 077 "Slot Tweeter" and it's Pro variant, the 2405. Later there was the ferrite 2405H. This model has the lightest diaphragm and offers the widest dispersion pattern and produces the highest frequencies.

    The third model offered by JBL was the 076. There was also a Pro variant offered, the 2403 in alnico and the 2403H in ferrite. It was originally designed specifically for the L220. It uses a unique diaphragm. I believe that it has a moving mass that is between the 075 and 077.

    The final model offered by JBL was the 2404H. It uses a mini butt cheek bi-radial horn. It uses the 2405 diaphragm, but is usable down to much lower frequencies than the 2405.


    Here is an on axis plot comparing two brand new 2402Hs.
    Attached Images Attached Images  

  2. #2
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,934
    This plot shows the off axis performance of a 2402H.


    On axis is in Red
    15° off axis is in Blue
    30° off axis is in Green
    45° off axis is in Purple
    Attached Images Attached Images  

  3. #3
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,934
    Here is the plot of a 2405.


    On axis is in Red
    15° off axis is in Blue
    30° off axis is in Green
    45° off axis is in Purple
    Attached Images Attached Images  

  4. #4
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,934
    Here is a plot of the 2403H (076 Cat Eye)


    On axis is in Red
    15° off axis is in Blue
    30° off axis is in Green
    45° off axis is in Purple
    Attached Images Attached Images  

  5. #5
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,934
    Here is a plot of a 2404H.


    On axis is in Red
    15° off axis is in Blue
    30° off axis is in Green
    45° off axis is in Purple
    Attached Images Attached Images  

  6. #6
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,934
    Here is a comparison we did between a pair of 2404Hs. One was labled 2404H and the other 2404H-1.
    Attached Images Attached Images  

  7. #7
    Super Moderator yggdrasil's Avatar
    Join Date
    Dec 2004
    Location
    Våle, Norway
    Posts
    1,159
    Widget, this is great.

    The 2402 rolls off earlier than the 2405. Is this due to the horn and / or diaphragm? Have you tested 2402 with 2405 diaphragm?

    Just curious?
    Johnny Haugen Sørgård

  8. #8
    RIP 2009
    Join Date
    Feb 2004
    Location
    Rohnert Park, CA
    Posts
    3,790
    Quote Originally Posted by Mr. Widget
    Here is a comparison we did between a pair of 2404Hs. One was labled 2404H and the other 2404H-1.
    Thanks for posting those! I believe the 2404H-1 uses the 2402 diaphragm and the 2404H uses the 2405 diaphragm.

    John

  9. #9
    Administrator Robh3606's Avatar
    Join Date
    Apr 2003
    Location
    Rocinante
    Posts
    7,973
    Excellent Widget!!!

    Thanks for posting those I have to save this thread for sure! It confirms some of my subjective impression when compairing the 2404/2405 when I was doing mock-up's for my 4344's. The 2405's seemed to have more detail and clarity up high with percusion and cymbals than the 2404. When I was building the 4344's I was tempted to try the 2404's but felt the 2405's were better in this respect and went with the stock set-up. Amazing how consistant the 2404's are off axis!!! Looking at the 076 you can keep them. I would just use the slot avoid the peaked response and save some bucks!

    Rob

  10. #10
    RIP 2011 Zilch's Avatar
    Join Date
    Jun 2004
    Location
    Berkeley, CA
    Posts
    10,036
    It's reassuring to note that, at least technically, JBL's been givin' us the straight poop about this stuff, it would appear.

    076 DOES have "charisma" going for it.

    [I'm over-invested in charisma, obviously....]

    Biradial is real, not hype.

    [Got my new 2405 diaphragms right here.... ]

  11. #11
    Senior Member Steve Schell's Avatar
    Join Date
    Jun 2003
    Location
    Long Beach, CA
    Posts
    1,474
    Thank you Mr. Widget for your very well and carefully done measurements. I agree that this thread is a keeper.

    Just curious; what was the input power used for the measurements, and the distance of the measurement mic?

  12. #12
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,934
    The distance was 1m. The power was milliwatts. The SPL measurement is calibrated, so you should be able to get a pretty close answer by using JBL's published sensitivity numbers. We never measured the actual power level. The power level chosen was based on a comfortable listening level during the tests.

    Widget

  13. #13
    Senior Member Steve Schell's Avatar
    Join Date
    Jun 2003
    Location
    Long Beach, CA
    Posts
    1,474
    Thanks. I dislike doing 1W tests myself, as they are so doggone loud with high sensitivity drivers. It is also unnecessary, as the curves at lower levels seem to perfectly track the higher power ones.

  14. #14
    Dis Member mikebake's Avatar
    Join Date
    Apr 2003
    Location
    Lima, Ohio, USA
    Posts
    2,630
    Nice, Widgie. I wish I hadn't parted with my mint 2405's or tent sale 2404's now. The slot has always been one of my favorite JBL drivers ever since meeting a pair of L300's in the 70's.

  15. #15
    Senior Moment Member Oldmics's Avatar
    Join Date
    Apr 2003
    Location
    Between Venus and Mars
    Posts
    865

    Just for Giggles

    Come on Widget

    Put the T.A.D. ET 703 plot in there for comparison.

    Inquiring minds want to know.

    Oldmics

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 2225, 2235 mass control ring
    By jbl in forum Lansing Product General Information
    Replies: 2
    Last Post: 07-04-2011, 09:13 PM
  2. Blue ring Control CM62
    By Dewey in forum Lansing Product Technical Help
    Replies: 0
    Last Post: 12-29-2004, 06:59 AM
  3. 2225, 2235 mass control ring?
    By jbl in forum Lansing Product General Information
    Replies: 7
    Last Post: 11-07-2003, 10:50 AM
  4. Tweeter Foam Ring
    By John in forum Lansing Product Technical Help
    Replies: 5
    Last Post: 10-12-2003, 08:55 PM
  5. mass controlling ring
    By johnhb in forum Lansing Product Technical Help
    Replies: 7
    Last Post: 06-29-2003, 05:20 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
  •