Emotiva Audio Airmotiv 4s Powered Studio Monitor 50 watts of bi-amplified power. Exclusive airmotiv high-frequency transducer provides crystal clear, extended highs- extending comfortably above the range of human hearing. Audiophile-Grade Amplification Class AB bi-amplification - separate amps for the woofer and the high-frequency transducer. At only 1/3 cubic foot per speaker, the airmotiv 4s are at home even on a small desk.