How to stop worrying about speaker impedance - CNET
How to Match Speakers and Amps | The Master Switch
If you have a 2-ohm, 4-ohm, and a 6-ohm resistor, how many different resistance values can you obtain from the set? Show how you would connect them to get each resistance value.
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Subwoofer Wiring Diagrams for Two 2 Ohm Dual Voice Coil Speakers