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Help With Crossover

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  • Help With Crossover

    Building an MTM using 2 Dayton ND140-8s as woofers and Vifa ( 0r Peerless by Tymphany) BC25SC55-04 Tweeter.

    Link to woofer:

    Link to tweeter:

    Baffle is 8 inches wide and 18 inches tall, with each woofer center 4 inches from top (or bottom) edge. Tweeter is centered and center of tweeter is 9 inches from top or bottom and 4 inches from center of woofer.

    I do not know how to use modeling software and my shoot in dark crossover is as follows:

    Lowpass: 2 mH coil in series and 14 uf shunt cap

    Highpass: 7 uf cap in series, .33 mH shunt coil, 1.5 ohm resistor in series and 4 ohm shunt resistor. Reverse polarity.

    Any help greatly appreciated.

    Thanks, Michael Moran.

  • #2
    The Aviatrix MTM uses these same woofers, but a different tweeter. You would have been better off building a pair of Aviatrix, a tested and proven design.

    In any case, without measuring and software, you can't really get a great crossover. Good luck!
    Mandolin Curved Cabinet Floorstanding; Dayton Reference 18" sealed Subwoofer; Sealed 12" Dayton Reference Subwoofer ; Overnight Sensation builds


    • #3
      I think Scott Sehlin's Lithiums used this combination of drivers. Search for that project and that could help.


      • #4
        This should be closer than your "shot in the dark".
        2nd order HP + L-pad: 6uF series cap, 0.25mH shunt coil, "L": SR = 5n (ohms), PR = 3n (normal polarity is indicated)
        2nd order (notched) LP + Zobel: 0.80mH series coil (w/a tiny 0.68uF "tank" cap across the coil),10uF shunt cap, Zobel = 5n + 20uF.
        About 82dB +/-2 or +/-2.5dB, full BSC, Fc near 2.5kHz.


        • #5
          Thanks a million Chris. I will try it out and let you know how it sounds.