What does AM stand for?

There are active monitor, confirmation, passive, powered, and PA speakers which help in better audio outputs.

Outside directors should function as active monitors of corporate management, not just in crisis but continually; they should have an active role in the formulation of the long-term strategic, financial, and organizational goals of the corporation and should approve plans to achieve those goals; they should as well engage in the periodic review of short- and long-term performance according to plan and be prepared to press for correction when, in their judgment, there is need.

The EX30 is an active monitor with a built in stereo mixer and digital effects processing.