One Dual Voice Coil Speaker in Series:

Dual 8 Ohm Subwoofer: 16 Ohms
Dual 6 Ohm Subwoofer: 12 Ohms
Dual 4 Ohm Subwoofer: 8 Ohms
Dual 2 Ohm Subwoofer: 4 Ohms
Dual 1.5 Ohm Subwoofer: 3 Ohms
One Dual Voice Coil Speaker in Parallel:

Dual 8 Ohm Subwoofer: 4 Ohms
Dual 6 Ohm Subwoofer: 3 Ohms
Dual 4 Ohm Subwoofer: 2 Ohms
Dual 2 Ohm Subwoofer: 1 Ohm
Dual 1.5 Ohm Subwoofer: 0.75 Ohm
Two Dual Voice Coil Speakers in Series / Parallel:
