Car Mono Amplifiers

Match the amplifier's RMS power to the continuous power handling of your subwoofer(s) at the same impedance; choose an amp with RMS within ±20% of the sub's RMS rating to avoid underpowering or overpowering

Choose an amplifier and subwoofer impedance that are compatible (commonly 2Ω or 4Ω); lower impedance lets the amp deliver more current and power but requires the amp to be rated for that load to avoid overheating or damage

Look for RMS power at relevant impedance, stable operation at your target ohms, a low-pass crossover, bass boost with adjustable frequency/Q, signal-to-noise ratio, and protection circuits (thermal/short/clip)

Car mono amplifiers commonly range from budget options under $100 to high-power units several hundred dollars; price varies with continuous power rating, build quality, brand, circuitry (Class D vs Class AB), and advanced features

Class D amps are generally more power- and space-efficient with higher thermal efficiency, making them common for subwoofers, while Class AB can offer different sonic character and may be chosen for preferences in audio quality or design

Use appropriately gauged power and ground wire sized for the amplifier's current draw, install a proper fuse near the battery, ensure solid grounding to chassis, and route signal and power cables separately to minimize noise

Allow sufficient ventilation, avoid mounting near heat sources, use correct impedance loads, keep connections clean and secure, and ensure the vehicle's electrical system can support the amp to prevent thermal shutdowns and failure