The MA/PA Series packs Yamaha's decades of commercial audio experience and know-how into compact, powerful, and reliable amplifiers protected by a rugged metal chassis. The MA/PA Series feature interfaces that have been specifically designed for effortless operation. A layout that gives priority to the frequently used output volume knob while other controls are visually subdued, for example, significantly enhances control efficiency in normal day-to-day operation. What's more, there is no need for computers or complex programming procedures for installation or operation. After a quick, easy setup procedure that requires no special knowledge or skill, the system is ready to deliver outstanding sound in a wide range of applications.