Each type of power amplifier has advantages and disadvantages. By employing different amplifier types for each driver, AIR12 loudspeakers use the respective strengths of Class D and Class A/B amplifiers to provide optimal response throughout the speaker's frequency range. A 500W (continuous), Class D amplifier powers the 12-inch low-frequency driver, providing efficient, clean power for gut-shaking low end when you need it. A 200W (continuous), Class AB amplifier powers the 1.35-inch high-frequency driver, delivering a natural sounding, AIR-y high end. The combination can deliver up to 131 dB SPL of sweet, clear sound between 48 Hz and 20 kHz.