Alto S-16 User Manual page 17

B. Wiring Configuration
You can connect unbalanced equipment to balanced inputs and outputs. Simply follow these schematics.
Strain Clamp
Strain Clamp
Strain Clamp
2=Hot(+)
Use for Balanced Mic Inputs
(For unbalanced use, connect pin 1 to 3)
3-pin XLR Male Plug
(seen from soldering side)
Tip
Sleeve
Use for Headphone, Stereo Return
1/4" Stereo (TRS) Jack Plug
Tip
Sleeve
Use for Mono Line In, Mono 1/4"Jack Plugs
1/4" Mono (TS) Jack Plug
Tip
Sleeve
Use for Pre-Gain Channel Inserts
1/4" Stereo (TRS) Jack Plug
2
1
1=Ground/Screen
3
3=Cold(-)
Ring=Right Signal
Ring
Sleeve=Ground/Screen
Sleeve=Ground/Screen
Ring=Return Signal
Ring
Sleeve=Ground/Screen
2=Hot(+)
(For unbalanced use, leave pin 3 unconnected)
3-pin XLR Line Socket
(seen from soldering side)
16
Tip=Left Signal
Tip=Signal
Tip=Send Signal
2
1
1=Ground/Screen
3
3=Cold(-)
Use for Main output