What does this Car Audio speaker equation mean?

RicKYM

New member
I know what it means when it says 4 ohms to 8 ohms by 4. Thats "a 4 or 8 ohm speaker, PER channel." But then there is this...4 ohms to 8 ohms x 2 + 2 ohms by 1. What does the last equation mean?
 
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