subwoofer crosover

Discussion in 'General Electronics Chat' started by electronis whiz, Apr 13, 2013.

  1. electronis whiz

    Thread Starter Well-Known Member

    Jul 29, 2010
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    I made a subwoofer a about a year ago old woofer no amp, so I added an amp from some old PC speakers I had. I put a filtercap in sires with it thinking that would let only the bass through. because it would charge up then release driving the woofer at bass frequency. talking to friend other day said inductor not capacitor, but not sure what to do for inducter, I have some really small tube ones and some from SMPS for filtering AC, but not sure those would work, or wether need biger like a small transformer or make one.
     
  2. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    You have to wind an air core inductor. You can wrap it onto a toilet paper roll.
     
  3. crutschow

    Expert

    Mar 14, 2008
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    You can also buy such crossover inductors such as one of these.

    Here's
    a calculator that will help you determine the inductor size you need.
     
  4. tubeguy

    Well-Known Member

    Nov 3, 2012
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  5. crutschow

    Expert

    Mar 14, 2008
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    Tubeguy's suggestion is the best if the amp is only powering the sub-woofer since it avoids inductors.

    It also has the advantage that you can adjust the corner frequency of the filter with a pot.
     
  6. #12

    Expert

    Nov 30, 2010
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    The reason for air core in the power section is that it is impossible for an air core to saturate.
    If you're going to filter at low power levels, iron core (anything that is not air) is OK.
     
  7. bertus

    Administrator

    Apr 5, 2008
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    #12 likes this.
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