The TOA 900 Series are widely recognized as the industry standard in installed sound system amplification. When reliability and performance are critical such as in paging and music distribution for airport, hospital, and industrial sound systems, you can count on the TOA 900 Series to perform consistently, day-in and day-out. The A-903MK2 (30 W) Modular Mixer/Amplifiers are engineered for high performance with wide frequency response, very low noise and distortion, and excellent output regulation.