one Speaker , 4 ohm Single Voice Coil

Subwoofer Wiring Wizard, One 4 ohm Single Voice Coil (SVC) Speaker

Option 1 = 4 ohm load

4-ohm SVC subwoofer/speakers are rated at 4-ohm at two terminals placed at opposite sides of the voice coil and connecting them in series (for subs/speakers voice coil connectivity terminals) adds to the equivalent impedance. Therefore, you’ll need an amplifier rated at 4-ohm! Equivalent impedance: 4? (ohm) Recommended amplifier: Stable at 2 or 1-ohm mono amplifier