Subwoofer wiring and impedance calculator

Enter your subs and see every final load you can wire them to. Then pick the one your amplifier is rated for.

Number of subwoofers

Voice coils per sub

Single voice coil (one pair of terminals) Dual voice coil (two pairs of terminals)

Ohms per coil (printed on the sub)1248

How wiring changes the load

Wiring identical coils or subs in parallel divides the impedance by how many there are. Wiring them in series adds them up. Amplifiers make more power into lower loads, but only down to the minimum they’re rated for. Going below it can overheat the amp or trip its protection.