Two combo inputs (2-way XLR and Mono jack 6.35) are available in EA515. CH A input can be switched between line input or microphone input. Besides, there is a RCA port for other sound resources like MP3, CD player, etc. The three different audio sources can be parallel output with one-way XRL after mixed internally, and then sent to different speakers for sound distribution.EA515 can be installed either horizontally or vertically by steel wire or U bracket. Also, it can be ground standing by coupling bar or three-feet stand. The double mount is 0°/10°adjustable by just pushing the button. Various accessories are offered for EA515 to meet different kinds of installs.