Midwest Audio Fest

It’s that time audio enthusiasts! Registration for the 2019 Speaker Design Competition is now open! Visit for details and to list your speaker project. We are excited to see all returning participants, and look forward to meeting some new designers this year, as well! Be sure your plans include a visit to the Parts Express Tent Sale for the lowest prices of the year, and the Audio Swap Meet where you can buy and trade with other audio fans. We hope to see you this summer! Vivian and Jill
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Driver geometry questions

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  • Driver geometry questions

    I'm learning how to use Jeff's 'Passive Crossover Designer'. I have watched all the Tube videos on this program but I'm still confusf on how to set up the Driver Geometry (circled in the pic). I know how to convert inches to meters. For example purposes, how would i set up driver geometry in a 2-way design using a Dayton Classic 5-1/4" round woofer and the round Dayton Classic 1-1/8" silky tweeter? Do I leave the Woofer "Y" value 0.000 and make the Tweeter "Y" value -0.??? (? = the distance the tweeter centnr would be when placed above the woofer). Also, do I need to worry about the Woofer "Z" value? If I do, would that value need to be a negative (-0.???) value? Say a -1/2" to -3/4" since its such a small woofer. Thanks for any help.

    Thanks for whoever suggested changing the settings in Windows to make things on the screemm super huge so I can see better.

  • #2
    If you hover over the boxes with red triangles in the upper right corner, they will pop up with tips that explain each setting. Typically, you use the tweeter as a reference, so it will be at position 0,0,0 (x,y,z). In your example, let's assume you have a 2-way TM with the woofer directly below the tweeter on the baffle. The woofer X position would stay zero since there is no offset. If there is an offset, a negative value is to the left of the tweeter and a positive is to the right. They Y position of the woofer would be meters (center to center distance on the baffle) since it's below the tweeter. A positive value would be above the tweeter. The Z value is the acoustic offset. This is arguably the most critical value (depending on crossover frequency) because a very small difference will result in a large change in the acoustic phase relationship between the drivers. This needs to be measured acoustically. There are lots of references on the forum as to how to do that. A negative Z value is typical for a woofer as that puts the acoustic center of the woofer further from the microphone than the tweeter.


    • #3
      Last edited by dynamo; 04-22-2018, 09:06 AM. Reason: Added a little more info


      • #4
        I think I have j pretty good grasp on how to set things up now. Not knowing what driver to use as a starting point confused me the most but now I know. Thanks for both responses, they helped.