Calculate total impedance for series, parallel, and series-parallel speaker configurations.
Parallel: Impedance divided. Lower total impedance, more power.
Effective speaker impedance: 8.00Ω
1 sub in parallel
Ztotal = Z1 + Z2 + ... + Zn1/Ztotal = 1/Z1 + 1/Z2 + ... + 1/ZnWire pairs in series first, then parallel the pairs together.
Your amplifier pushes more current into lower impedance loads. Drop from 4Ω to 2Ω and you could nearly double your power output—assuming your amp can handle that load without going into protect mode.
Typical mono amps handle 1Ω loads while stereo channels usually bottom out at 2Ω. Push past these limits and you'll trip thermal protection or worse. Always check the spec sheet.
Dual voice coil drivers give you wiring options. Connect coils in series to double impedance, or parallel them to cut it in half. This flexibility lets you hit your amp's sweet spot.