8ohms-4ohms

Discussion in 'General Electronics Chat' started by Cobs, Sep 25, 2012.

  1. Cobs

    Thread Starter New Member

    Sep 25, 2012
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    Hi guys can anyone please tell me how I can reduce an 8Ohms tweeter to 4Ohms
    Thanks for your help
     
     
  2. BMorse

    Senior Member

    Sep 26, 2009
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    well it all depends on what that tweeter input comes from..... is it connected to a crossover circuit or any kind of Hi-Pass filter circuit, etc.?
     
  3. Cobs

    Thread Starter New Member

    Sep 25, 2012
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    Hi yes I will go through a crossover the problem I have is the original tweeter they no longer produce parts for but I have found a voice coil that will fit from the same manufacture
    Thanks
     
  4. BMorse

    Senior Member

    Sep 26, 2009
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    a 4-ohm resistor is required to match the impedance for crossover values to remain the same, although, the efficiency of the new tweeter should be a consideration, since adding the 4 0hm resistor will drop the output by 3 dB.
     
  5. Cobs

    Thread Starter New Member

    Sep 25, 2012
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    Hi and thanks for the reply would you be able to tell me the colour code for that and where to put the resistor ??
     
  6. BMorse

    Senior Member

    Sep 26, 2009
    2,675
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    you would put it in series with the speaker, BUT, this will dissipate half the wattage so it will get hot..... I would find a sufficiently rated resistor for that, but I really would not recommend doing it this way, you can always add another 4 ohm tweeter in series with it, or get a different crossover that can handle driving the 4 ohm tweeter.

    It is a non-standard value, I doubt you will find one off the shelf > Yellow, black, gold
     
    Last edited: Sep 25, 2012
  7. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    You forgot to post the crossover circuit. Sometimes it is just one simple capacitor in series with the tweeter to block bass sounds. Replace the capacitor designed for 4 ohms with a capacitor having half its value for 8 ohms.

    If the new tweeter is not loud enough then simply turn up the treble tone control.
     
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