M404A · RTO-144 Connections

HP LP FILTER · series S400 · out 600 Ω

Rear connector

REAR VIEW · CARD EDGE · 22 CONTACTS12345Filter IN LEFT + / FILTE6Filter IN LEFT − / FILTE7JMP.6.78910111213FILTER OUT LEFT + / FILT14FILTER OUT LEFT − / FILT15JMP.15.16 = 300Ω->620Ω->161718VCC-AUDIO GND19VCC-LAMP GND20VCC-LAMP +24V2122VCC-AUDIO +48VInputOutputPowerGround / chassisJumper

Inputs and outputs

M404AHP LP FILTERFilter IN LEFTA1 5 / 6FILTER OUT LEFTA2 13 / 14FILTER OUT RIGHTA3 5 / 6FILTER 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↔15

Audio connections · RTO-144 A / B

PortSignalDirPin +Pin −Pad +Pad −
A1Filter IN LEFTin565.A.1.P6.A.1.N
A2FILTER OUT LEFTout131413.A.2.P14.A.2.N
A3FILTER OUT RIGHTout565.A.3.P6.A.3.N
A4FILTER 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->300Ω1515

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
M404A RTO-144 connections
Drn.
make_rto144.py
Date
Oct 17 2026