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Easy ZMA and T/S Parameters Using The LIMP Module in ARTA - An Illustrated Guide

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  • Easy ZMA and T/S Parameters Using The LIMP Module in ARTA - An Illustrated Guide

    This modest contribution is for newcomers to this great hobby who have done kits, but wish to go deep (football pun intended) and design their own. We often read about budget constraints and especially about where to start. Well, here's one way to start determining the parameters of any speaker driver, and produce accurate ZMA files without breaking the bank. Here we go:

    1. Download ARTA software (current version is 1.8.5) from http://artalabs.hr/download.htm.
    Total cost: Free

    2. Hardware Requirements:

    a. Laptop or desktop running Windows 7 or 10.
    b. http://artalabs.hr/requirements.htm
    c. Digital Multimeter (DMM).
    d. Appropriate audio cables to connect jig, soundcard and speaker driver.
    e. Weight for added mass method (explained below).
    f. Double-sided scotch tape.

    3. Measurement Jig Bill of Materials:

    a. 6X3X2 project box:
    http://www.parts-express.com/hammond...1-x-2--320-714

    b. Dual binding post:
    http://www.parts-express.com/parts-e...black--090-475

    c. 2 pairs of RCA jacks:
    http://www.parts-express.com/parts-e...-pair--090-278

    d. One 100ohm resistor:
    http://www.parts-express.com/100-ohm...rance--015-100

    Total parts cost: $15.31
    Last edited by hongrn; 01-03-2017, 02:55 PM.

  • duronboy
    replied
    I ordered a few of .1% resistors suggested earlier in the thread. Made a post in the classifieds if someone wants one without spending $8 on shipping.

    Leave a comment:


  • filmslayer
    replied

    thanks Hong . it just got me wondering . there is not much cost difference a 10w is only $ .98 .

    Leave a comment:


  • hongrn
    replied
    I use a 2 watt 1% tolerance resistor in mine without issues. I don't know if higher wattage matters.

    Leave a comment:


  • filmslayer
    replied
    does the resistors wattage matter ?

    Leave a comment:


  • Kornbread
    replied
    Just a heads up if you bought a Behringer uca222 to take measurements with ARTA or REW. It's not really plug n play. At least not in my case. I let the uca222 install whatever drivers/software it installed, and it worked, or so I thought, really it only partially worked (only driver available was wmd), so I went to the Behringer site and the listed driver for the uca222 was ASIO4ALL. Downloaded and installed that with the same results. You will need the Behringer 2902 2.8.40 driver for the uca222 to work properly with ARTA or REW.

    Also, take a look at these measurements. Both ARTA and REW produced almost identical impedance sweeps of the FaitalPro 5fe120 and Vifa xt25. Why is the impedance rising in the bass?

    Click image for larger version

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  • hongrn
    replied
    You don't need the amp to test for impedance, so your set up should look like this:

    Click image for larger version

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  • Kornbread
    replied
    Is this wired correctly to test impedance? The binding posts from the limp module attach at the same point as the amp to the speaker lugs?
    Click image for larger version

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  • Hipocrates
    replied
    This is Awesome, many thanks!

    Leave a comment:


  • hongrn
    replied
    Slow down. This is a hobby that is supposed to have a calming effect on the mind. No one is calling you names, or even thinking of you as such.

    Leave a comment:


  • blindsquirrel
    replied
    Apologies. I am very literal and don't deal well with ambiguity. So when I see one statement that says:
    Note: Do not connect your speaker driver to the jig during the calibration process.
    ...and another one that says:
    Connect left and right input channel to signal generator output!
    ...those seem to be saying different things. Everything is simple and obvious once you understand it.

    And thank you for assuming I'm a moron who didn't even attempt to read the thread before asking moron questions.

    Leave a comment:


  • hongrn
    replied
    Calibration is explained in post number 6. Please try to read the entire thread and follow the instructions.

    Leave a comment:


  • blindsquirrel
    replied
    Calibration? Anybody? Hello?

    Leave a comment:


  • blindsquirrel
    replied
    Calibration question... it's not clear if cal is done with output looped to input (that's what LIMP seems to say) or with the jig plugged in but not connected to anything on the test clips. Which is it?

    I fought this crap for four days getting nowhere. I built a jig per diagrams but it would. not. work. for anything. All I got was two nearly straight horizontal lines. Tried 3 different laptops with WDM and ASIO drivers, my desktop with a good Xonar DG card, and then the onboard sound on the desktop. No go on all. Didn't start working until I went to Measurement Setup > Measurement config > Reference channel > and changed from the default Right, to Left. All of a sudden it's giving plausible results. What did I do wrong?

    Leave a comment:


  • theinventor
    replied
    Thanks for the post Hong.

    Leave a comment:

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