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Audio (and aftermarket electronics) This is your place for alarms, remote starters, to brag about your system, exaggerate your db levels, or simply ask questions for stock or aftermarket audio. No Flames! (except from roasted amps)

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Old 08-21-2006, 09:06 PM   #11
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The product over the sum formula only works for two parallel resistances. The more advanced form of the formula is 1 / ( (1/R1) + (1/R2) + (1/R3) + (1/R4) + ... ) and so forth.

To answer your question plug in the voice coil values for R

1 / (1/3) + (1/3) + (1/3)...

1 / .9999999

= 1 ohm

Another example, MTX sells 12 ohm subs, plug in 12 for R1, R2 and R3 and you end up with a 4 Ohm load
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