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Thread: 250ti Top End

  1. #31
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    Quote Originally Posted by opimax View Post
    I worked with some 250s have 4 all TI now , new xovers in one set that are Charge Coupled that was not the original Xover for that model. I remember finding the diagrams very confusing and possibly incorrect. Make sure you have the correct diagram too. There 3 or 4 version of 250 speakers, 3 TIs i think including European version and 1 set that was Charge Coupled from the factory. Part of the confusion comes from JBL switching to the current standard or polarity during the time the 250 series was built. Original woofers went inward when touched to a battery to test, positive terminal to the positive battery . It switched at some year but i would think your version is past the switch. I was never (and still am ) sure if I have polarity each driver 100% correct.

    you have gold tweeter , never let it go!! rare

    Yes thanks Opimax and Robh.

    I changed the connections to the drivers according to the resistance through the crossovers but that was not conclusive as the resistance was almost exactly the same. Only changed one speaker and left the other as it was. Actually they sound almost identical - with the modified crossover sounding less boomy.

    I think the only way to be sure is to test the speakers with a sound level meter. Can anyone recommend a decent setup to do this?

  2. #32
    Administrator Robh3606's Avatar
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    I think the only way to be sure is to test the speakers with a sound level meter. Can anyone recommend a decent setup to do this?
    You should really use a proper measurement system if you can to look for suck outs to verify if the drivers are connected improperly. You might be able to tell if you used a tone/band limited noise at the crossover frequency and checked the spl level and then reversing the phase to see which way is louder. The louder one is the correct one.

    Rob
    "I could be arguing in my spare time"

  3. #33
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    Quote Originally Posted by sweet212 View Post
    I think the only way to be sure is to test the speakers with a sound level meter. Can anyone recommend a decent setup to do this?
    MiniDSP claibrated (compensation file) https://www.minidsp.com/products/aco...urement/umik-1 then the software of your choice =)

  4. #34
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    Quote Originally Posted by Malefoda View Post
    MiniDSP claibrated (compensation file) https://www.minidsp.com/products/aco...urement/umik-1 then the software of your choice =)

    $75 - very reasonable thanks Malefoda and Robh.

    What about software? What is the most economical and use-able software?

  5. #35
    Senior Member Odd's Avatar
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    REW

    REW
    Room Acoustics Software

    Free and very good.
    A lot of info online.
    43XX (2235-2123-2450-2405-CC 3155)5235-4412-4406-4401-L250-18Ti-L40-S109 Aquarius lV-C38 (030) 305P MkII

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