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Really stupid dual voice coil question...

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  • Really stupid dual voice coil question...


    Can you just power one coil?



  • #2
    Yes *NM*



    Paul O

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    • #3
      Re: Really stupid dual voice coil question...


      > Can you just power one coil?

      Yes, but the Q will be dramatically higher.* For example, I have an old set of 8 inch Peerless CC line DVC woofers. The spec sheet lists the paramters the Qts for driving both coils at 0.23 but when only one coil is driven that rises to 0.39. Of course BL factor, sensitivity and power handling all go down as well but I'm sure you knew that already.

      *I have seen some suggest using a shunt resistance across the second coil to damp the driver and lower the Q but that always struck me as not a particularly good idea.

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      • #4
        Re: Really stupid dual voice coil question...

        Provided Link: Adire technical paper


        > Yes, but the Q will be dramatically higher.*
        > For example, I have an old set of 8 inch
        > Peerless CC line DVC woofers. The spec sheet
        > lists the paramters the Qts for driving both
        > coils at 0.23 but when only one coil is
        > driven that rises to 0.39. Of course BL
        > factor, sensitivity and power handling all
        > go down as well but I'm sure you knew that
        > already.

        > *I have seen some suggest using a shunt
        > resistance across the second coil to damp
        > the driver and lower the Q but that always
        > struck me as not a particularly good idea.

        Below is a really good paper on RDO (Resistively Dampened Operation) is DVC loudspeakers, and some good info on using one VC of a DVC driver.

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        • #5
          Re: Really stupid dual voice coil question...


          > Yes, but the Q will be dramatically higher.*
          > For example, I have an old set of 8 inch
          > Peerless CC line DVC woofers. The spec sheet
          > lists the paramters the Qts for driving both
          > coils at 0.23 but when only one coil is
          > driven that rises to 0.39. Of course BL
          > factor, sensitivity and power handling all
          > go down as well but I'm sure you knew that
          > already.

          > *I have seen some suggest using a shunt
          > resistance across the second coil to damp
          > the driver and lower the Q but that always
          > struck me as not a particularly good idea.

          It's not a good idea in my opinion either. If you short the second coil to lower the Qts you also end up loosing 6dB of sensitivity over a woofer with both coils driven. My position is either wire them in parallel or in series, but drive them both. Use all of the wire available in the gap, not half of it.

          Click here for Jeff Bagby's Loudspeaker Design Software

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