M490A · RTO-144 Connections
M490A - Mic Pre-amp · series 2200- Mic Pre
Rear connector
Inputs and outputs
Audio connections · RTO-144 A / B
| Port | Signal | Dir | Pin + | Pin − | Pad + | Pad − |
|---|---|---|---|---|---|---|
| A1 | Mic in A | in | P2-1 | P2-A | P2-1.A.1.P | P2-A.A.1.N |
| A2 | Mic in B | in | P2-3 | P2-C | P2-3.A.2.P | P2-C.A.2.N |
| A3 | Left PGRM 1 | io | P1-1 | P1-2 | P1-1.A.3.P | P1-2.A.3.N |
| A4 | Right PGRM 1 | io | P1-3 | P1-4 | P1-3.A.4.P | P1-4.A.4.N |
| B1 | Insert Send | out | P2-6 | P2-F | P2-6.B.1.P | P2-F.B.1.N |
| B2 | Insert Return | in | P2-7 | P2-H | P2-7.B.2.P | P2-H.B.2.N |
Power · bench PSU
| Rail | Style | Volts | Max A | Supply | Ground | Link |
|---|---|---|---|---|---|---|
| VEE-AUDIO | NEW | -25 | 0.2 | P2-19 | P2-20 | 2 |
| VCC-AUDIO | NEW | 25 | 0.2 | P2-21 | P2-20 | 1 |
Jumpers
| Function | Designation | From | To |
|---|---|---|---|
| Insert | JMP.6.7 | P2-6 | P2-7 |
| Insert | JMP.F.H | P2-F | P2-H |
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
M490A RTO-144 connections
Drn.
make_rto144.py
Date
Oct 17 2026