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Thread: JBL 2450 with Truextent vs TAD 4001?

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    JBL 2450 with Truextent vs TAD 4001?

    I need your help.
    Still deciding what is best thing to do.
    Anybody had a chance to compare JBL 2450 loaded with Truextent diaphragms vs TAD 4001?
    What you will choose?

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    Unabashed Speakerholic cosmos's Avatar
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    Quote Originally Posted by neskor View Post
    I need your help.
    Still deciding what is best thing to do.
    Anybody had a chance to compare JBL 2450 loaded with Truextent diaphragms vs TAD 4001?
    What you will choose?
    We did not listen to the Truextents in 2450, they were in either 2441 or 2445. However, when compared to TADs, I'd give them a slight edge. Others in the group might give the Tads the nod, but in any case, it was close. Very close. I don't think you could lose with either combination.

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    Administrator Mr. Widget's Avatar
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    I've heard both, but not at the same time... so I can't make a useful comparison. As cosmos said, I don't think you would be making a mistake with either assuming the TADs are up to spec and the Truextent's are properly installed in the JBLs.


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    I had some bad experience buying old and (ab)used Alnico drivers.
    Unfortunately there is no recharge service in my country
    Maybe is better and safer to go with neodymium magnet.

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    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by neskor View Post
    Maybe is better and safer to go with neodymium magnet.
    If you don't have the drivers yet, and you choose the JBL route, you can safely go with ferrite. They are larger and heavier, but they also are less costly. I would go with the 2446 if I wanted a 2" throat.


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    Senior Member pos's Avatar
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    Guido recommends the Radian 950PB driver which is supposed to be better thanks to its 5-slit phasing plug. He also sells 950PB drivers with truextent diaphragms installed

    I am running truextent 16ohms diaphagms in 2450 cores and I really like what I hear and measure, much improved over Ti and Ti SL diaphragms. They require some compensation in the high tho: if you want to run them with a passive filter it would probably be much easier to use a Ti SL diaphragm or a TD4001...
    What you get with the truextent is a very efficient mid/high band, and a really well behaved (but rolled off) top end. The milar surround certainly has much to do with this.

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    Quote Originally Posted by pos View Post
    What you get with the truextent is a very efficient mid/high band, and a really well behaved (but rolled off) top end. The milar surround certainly has much to do with this.
    My plan is to use 2405 above 10KHz

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    Quote Originally Posted by pos View Post
    Guido recommends the Radian 950PB driver which is supposed to be better thanks to its 5-slit phasing plug. He also sells 950PB drivers with truextent diaphragms installed
    Very tempting! Too bad it has the wrong brand name stamped on the back.

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    I have some plots of JBL 2450j with Truextent diaphragm from German magazine.
    Is it ok to post results here or is that forbidden?

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    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by neskor View Post
    I have some plots of JBL 2450j with Truextent diaphragm from German magazine.
    Is it ok to post results here or is that forbidden?
    As long as you realize any copyright infringement is by the poster not the Forum.


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    Here it is.
    I hope nobody will sue me
    Attached Images Attached Images  

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    Senior Member spkrman57's Avatar
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    2446 Be

    Quote Originally Posted by Mr. Widget View Post
    If you don't have the drivers yet, and you choose the JBL route, you can safely go with ferrite. They are larger and heavier, but they also are less costly. I would go with the 2446 if I wanted a 2" throat.
    Widget

    I have Be diaphrams in my 2446's mounted on 500Hz tractix Edgarhorns and use them on top of my 2226's and they sound great, at least to my ears! I used to have them on my 350Hz Edgarhorns shown in my avatar.

    Regards, Ron
    JBL Pro for home use!

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    Senior Member Guido's Avatar
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    Obsolete

    Quote Originally Posted by neskor View Post
    Here it is. I hope nobody will sue me
    Obsolete!! These measurements where taken with the first run of Truextent diaphragms. Due to a problem with the fixation of the VC leads these had k2 issues as can be seen. k2 is way to high. The newer diaphragms behave much better!
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    BLS Reference on Passlabs XA 30.5 + Everest DD66000 clone on Pass XA 100.5

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    Quote Originally Posted by Guido View Post
    Obsolete!! These measurements where taken with the first run of Truextent diaphragms. Due to a problem with the fixation of the VC leads these had k2 issues as can be seen. k2 is way to high. The newer diaphragms behave much better!
    Good to hear that!

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    Senior Member maxwedge's Avatar
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    Quote Originally Posted by Guido View Post
    Obsolete!! These measurements where taken with the first run of Truextent diaphragms. Due to a problem with the fixation of the VC leads these had k2 issues as can be seen. k2 is way to high. The newer diaphragms behave much better!
    How do you tell if you have a fist run? Just measuring them? I bought a pair 3/11 and they sound good to me.
    Edit: I see the article is 6/10 so maybe I got a gut set.

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