MASTER - Controls the overall volume level of the mixer

BALANCED MASTER OUTPUT - 1/4" TRS balanced connectors (typically used to connect to a P.A. mixer or an amplifier for live performances or a recording console for recording).

UNBALANCED MASTER RCA OUTPUT - RCA connectors are typically used to connect to a home stereo, or to another mixer with RCA inputs for practicing or team routines. Several SA-12s can be daisy chained together by plugging this output via the Line 3 input.