Single Voice Coil
Two 2 Ω subs wired in series to 4 Ω Two 4 Ω subs wired in series to 8 Ω
Two 2 Ω subs wired in parallel to 1 Ω Two 4 Ω subs wired in parallel to 2 Ω
Dual Voice Coil
One DVC 2 Ω sub wired in series to 4 Ω One DVC 4 Ω sub wired in series to 8 Ω Two DVC 2 Ω subs wired to 0.5 Ω Two DVC 4 Ω subs wired to 1 Ω
One DVC 2 Ω sub wired in parallel to 1 Ω One DVC 4 Ω sub wired in parallel to 2 Ω Two DVC 2 Ω subs wired to 2 Ω Two DVC 4 Ω subs wired to 4 Ω