M406 · RTO-144 Connections

M406 Compressor · out 600 Ω

Rear connector

REAR VIEW · CARD EDGE · CONTACTS 1-22 SHOWN1Compressor IN +2Compressor IN −345678910111213Compressor OUt +14Compressor OUt −15Meter OUT +16Meter OUT −17Side Chain18VCC-AUDIO GND19VCC-LAMP GND20VCC-LAMP +24V2122VCC-AUDIO +48VInputOutputPowerGround / chassisLogic

Inputs and outputs

M406M406 CompressorCompressor INA1 1 / 2Compressor OUtA2 13 / 14Meter OUTB2 15 / 16INPUTSOUTPUTSVCC-AUDIO48 V 22 / GND 18VCC-LAMP24 V 20 / GND 19

Audio connections · RTO-144 A / B

PortSignalDirPin +Pin −Pad +Pad −
A1Compressor INin121.A.1.P2.A.1.N
A2Compressor OUtout131413.A.2.P14.A.2.N
B2Meter OUTout151615.B.2.P16.B.2.N

Power · bench PSU

RailStyleVoltsMax ASupplyGroundLink
VCC-AUDIOOLD480.12218—
VCC-LAMPOLD240.12019—

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
M406 RTO-144 connections
Drn.
make_rto144.py
Date
Oct 17 2026