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Old 08-21-2006, 10:06 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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