Samson S-MAX MD1 Single Channel Passive Direct Box - Manual (Page 4)

Callouts
1 2 3 4
1. INPUT – 1/4” hi-Z input jack for connecting for instruments or line level signals.
2. THRU – 1/4” output for passing the input signal through to a stage amplifier or monitor system.
3. GROUND LIFT – When the switch is engaged, the input ground (pin-1) is disconnected.
4. BALANCED OUTPUT – Male XLR low-Z connector.