M461AB · RTO-144 Connections
Microphone Preamp
Rear connector
Inputs and outputs
Audio connections · RTO-144 A / B
| Port | Signal | Dir | Pin + | Pin − | Pad + | Pad − |
|---|---|---|---|---|---|---|
| A1 | Mic In | in | 1 | A | 1.A.1.P | A.A.1.N |
| A2 | Line | io | 10 | L | 10.A.2.P | L.A.2.N |
| A3 | Right OUT | out | 16 | T | 16.A.3.P | T.A.3.N |
| A4 | Direct OUT | out | 9 | K | 9.A.4.P | k.A.4.N |
| B1 | Insert Send | out | 14 | R | 14.B.1.P | R.B.1.N |
| B2 | Insert Return | in | 13 | P | 13.B.2.P | P.B.2.N |
| B3 | CHON OUT - OUT | out | 12 | N | 12.B.3.P | N.B.3.N |
| B4 | Fader Return | in | 11 | M | 11.B.4.P | M.B.4.N |
Power · bench PSU
| Rail | Style | Volts | Max A | Supply | Ground | Link |
|---|---|---|---|---|---|---|
| VEE-AUDIO | NEW | -25 | 0.1 | 19 | 20 | 2 |
| VCC-AUDIO | NEW | 25 | 0.2 | 21 | 20 | 1 |
| VCC-LAMP | NEW | 24 | 0.1 | Y | 18 | — |
Jumpers
| Function | Designation | From | To |
|---|---|---|---|
| CH ON LAMP | JMP.Z.W | Z | W |
| 24V Ground | JMP.X.18 | X | 18 |
| 24V to 25V | JMP.Y.21 | Y | 21 |
| CH ON GND | JMP.3 | 20 | 18 |
| Insert SEND | JMP.14.13 | 14 | 13 |
| Insert Return | JMP.R.P | R | P |
| Fader Send | JMP.12.11 | 12 | 11 |
| Fader Return | JMP.N.M | N | M |
Source: Ward-Beck Systems - Module RTO-144 Jumper calculator.xlsx (Database tab). Pin direction is inferred from the signal name. Verify against the module schematic before wiring.
WBS Ward-Beck Systems Ltd.
Title
M461AB RTO-144 connections
Drn.
make_rto144.py
Date
Oct 17 2026