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Thread: Ring Radiator Comparisons

  1. #1
    Administrator Mr. Widget's Avatar
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    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
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    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
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    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  

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    Administrator Mr. Widget's Avatar
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    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
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    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  

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    Administrator Mr. Widget's Avatar
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    Here is a comparison we did between a pair of 2404Hs. One was labled 2404H and the other 2404H-1.
    Attached Images Attached Images  

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    Super Moderator yggdrasil's Avatar
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    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
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    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

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    Administrator Robh3606's Avatar
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    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

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    RIP 2011 Zilch's Avatar
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    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
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    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
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    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
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    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
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    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.

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    Senior Moment Member Oldmics's Avatar
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    Just for Giggles

    Come on Widget

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

    Inquiring minds want to know.

    Oldmics

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