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  • New build for me

    Going to try an MTM with these drivers.

    Woofers: Usher 8945P
    Tweeter: SEAS Prestige 27TBCD/DXT

    First try at designing a crossover too, so let see how long this takes. Once I get far enough along, I'll create a post in the project showcase.

    Opinions welcome.

  • #2
    If you search PE for # 296-602, you can still get (15 yr old!) CLIO f/z data for these woofers.
    PM sent.

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    • #3
      Started toying with the design of the crossover. This is a novice first stab based on previous designs compiled in XSim. Critiques are welcome.Click image for larger version  Name:	89459 dxt MTM circuit.jpg Views:	0 Size:	65.9 KB ID:	1428517

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      • #4
        Click image for larger version

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        • #5
          This is where I am most unsure of things.

          Click image for larger version

Name:	89459 dxt MTM imp.jpg
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          • #6
            Perhaps I should move this to the Speaker Project section?

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            • #7
              Your LCR "notch" on the woofers is basically ineffectual, and up near 6kHz, whereas the breakup is more like an octave lower.
              There's nothing wrong w/your impedance plot.

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              • #8
                Will go back to notch and remove to see what the effect is. Thanks for the feedback

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                • #9
                  You could probably tank that breakup over the first inductor. It would save you a coil and use a tiny cap - maybe a .47uF. I would add a few ohms in series with that cap just to keep from shunting HF directly to ground and making your amp unhappy.

                  -- Just looked at the raw response from the Usher - maybe a simple tank won't be effective here. Carry on....
                  Co-conspirator in the development of the "CR Gnarly Fidelity Reduction Unit" - Registered Trademark, Patent Pending.

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                  • #10
                    Tried a second order on the woofers and retooled the notch. This allowed me to remove the padding on the tweeter.
                    Click image for larger version

Name:	89459 dxt MTM circuit v2.jpg
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                    • #11
                      response, a little dip at 1.2k I can't seem to deal with. I can probably live with that
                      Click image for larger version  Name:	89459 dxt MTM freq v2.jpg Views:	0 Size:	149.3 KB ID:	1428743

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                      • #12
                        impedance
                        Click image for larger version

Name:	89459 dxt MTM imp v2.jpg
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ID:	1428745

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