Match a subwoofer and amplifier.
Subwoofer diameter and headline wattage are not enough. Match RMS power at the final wired impedance, confirm the voice-coil arrangement, and use an enclosure that suits the exact driver.
Electrical and acoustic requirements must agree.
| Check | What to compare | Common mistake |
|---|---|---|
| RMS power | Amplifier RMS output at the final load versus the subwoofer’s continuous power rating. | Using peak or maximum wattage as the matching value. |
| Final impedance | Voice-coil impedance, coil count, number of drivers and the intended wiring arrangement. | Comparing amplifier power at an impedance the wired system will not present. |
| Enclosure | Recommended sealed or vented volume, displacement, port requirements and mounting depth. | Assuming every enclosure for the same nominal diameter is suitable. |
| Electrical supply | Current demand, cable size, fuse protection, ground path and vehicle charging capacity. | Budgeting for the amplifier but not the current it needs. |
Voice coils create wiring options.
A dual-voice-coil driver does not automatically handle more power. It offers more ways to reach a final impedance. Use only a wiring arrangement supported by both the subwoofer and amplifier.
Headroom still needs control.
An amplifier with suitable clean headroom can work well when gain, filters and system limits are set correctly. Excess power, clipping or incorrect filtering can damage equipment; a wattage match is not a substitute for setup.
Compare the exact specifications together.
Common matching questions
Should amplifier RMS exactly equal subwoofer RMS?
It does not need to be numerically identical, but compare continuous ratings at the final impedance and follow both manufacturers’ operating limits. Setup, enclosure and signal quality also matter.
Can an amplifier run below its minimum impedance?
No. A lower load can exceed the amplifier’s current and thermal limits. Wire the voice coils and driver count to a supported final impedance.
Does a bigger subwoofer always play louder?
No. Output depends on driver capability, power, enclosure, frequency range and vehicle loading. Diameter alone does not define system output or sound quality.