How to wire a dual 4 ohm sub to 8 ohm

To wire a dual 4 ohm sub to 8 Ω: Each sub’s two coils in series: 8 Ω per sub. One sub to the amp.

The other final loads these subs can make: 2 Ω.

8 Ω: Each sub’s two coils in series: 8 Ω per sub. One sub to the amp.

Every balanced way to wire a dual 4 ohm sub

Every balanced way to wire a dual 4 ohm sub
Final load	How
2 Ω	Each sub’s two coils in parallel: 2 Ω per sub. One sub to the amp.
8 Ω	Each sub’s two coils in series: 8 Ω per sub. One sub to the amp.

On each sub, jump coil A − to coil B +. A + and B − are now the sub’s terminals.

Each box is one voice coil. Wires that meet are joined; use proper terminals, not twisted wire and tape.

Left side of each coil box is its + terminal. 1A = sub 1, coil A.

Nominal loads: the real impedance rises in the box and with frequency. Only balanced layouts are shown, where every sub gets the same power.

To wire a dual 4 ohm sub to 8 Ω: Each sub’s two coils in series: 8 Ω per sub. One sub to the amp.

With balanced wiring: 2 Ω, 8 Ω.

Only if its manual says it is stable at 8 Ω or lower. Below that it runs hot, goes into protect or fails.