M402B · RTO-144 Connections

EQUALIZER · series S400 · line in 600 Ω, out 600 Ω

Rear connector

REAR VIEW · CARD EDGE · 22 CONTACTS12345EQ IN LEFT + / EQ IN RIG6EQ IN RIGHT −7JMP.6.78EQ IN LEFT −910111213EQ OUT LEFT + / EQ OUT R14EQ OUT LEFT − / EQ OUT R15JMP.15.16 = 300Ω->620Ω->16JMP.15.16 = 300Ω->620Ω->1718VCC-AUDIO GND19VCC-LAMP GND20VCC-LAMP +24V2122VCC-AUDIO +48VInputOutputPowerGround / chassisJumper

Inputs and outputs

M402BEQUALIZEREQ IN LEFTA1 5 / 8EQ IN RIGHTA3 5 / 6EQ OUT LEFTA2 13 / 14EQ OUT RIGHTA4 13 / 14INPUTSOUTPUTSVCC-AUDIO48 V 22 / GND 18VCC-LAMP24 V 20 / GND 19⌒ JMP.6.7 6↔7⌒ JMP.15.16 = 300Ω->620Ω->300Ω 15↔16

Audio connections · RTO-144 A / B

PortSignalDirPin +Pin −Pad +Pad −
A1EQ IN LEFTin585.A.1.P—
A2EQ OUT LEFTout131413.A.2.P14.A.2.N
A3EQ IN RIGHTin565.A.3.P6.A.3.N
A4EQ OUT RIGHTout131413.A.4.P14.A.4.N

Power · bench PSU

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

Jumpers

FunctionDesignationFromTo
600Ω InputJMP.6.767
OUtput 2JMP.15.16 = 300Ω->620Ω->300Ω1516

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
M402B RTO-144 connections
Drn.
make_rto144.py
Date
Oct 17 2026