Insignia NS-SUB12 - Manual (Page 5)

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Connecting your subwoofers
Recommended wiring
Parallel voice coil configuration
Series voice coil configuration
2 ohm load
4 ohm 4 ohm
4 ohm 4 ohm 4 ohm 4 ohm
1 ohm load
Amplifier
Amplifier
4 ohm 4 ohm
8 ohm load
Amplifier