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Multi-Way Conventional loudspeakers with crossovers

paralleling voice coils
paralleling voice coils
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Old 15th November 2002, 01:13 PM   #1
Opie is offline Opie
diyAudio Member
Join Date: Oct 2001
Location: UW Stevens Point Campus
Default paralleling voice coils

I have found a sub in my basement collection with dual voice coils. What is the effect on spl when the voice coils are put in parallel as opposed to series?


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Old 15th November 2002, 01:41 PM   #2
AndrewJ is offline AndrewJ
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Join Date: Sep 2001
Opie, the efficiency of the driver will be unchanged with either connection, but the sensitivity will be different.
Suppose each coil is four ohms, and driven from a voltage source providing 2volts. With the coils in parallel, each will draw a current of 2/4=0.5 amps. If the product of flux density and coil length (Bl) is say 5 for each coil, then the force produced is F=Bli x2= 2.5 x 2 =5
Now wire them in series. Each will now only have 1volt across the coil, so the current in each coil is now only 1/4=0.25 amps. The total force is now 5 x .25 x 2 = 2.5.
The force on the cone is now one half that of the parallel connection, so the output is 6dB down, though the impedance is 8ohms rather than 2ohms.

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