M457 · RTO-144 Connections

M457 - Pre-Mixer · out 600 Ω

Rear connector

REAR VIEW · CARD EDGE · 44 CONTACTS1MIC IN 4 +23MIC IN 3 +456MIC IN 2 +78MIC IN 1 +91011External IN B +12External IN A +13141516B-Mix OUT +17A-Mix OUT +1819202122AMIC IN 4 −BCMIC IN 3 −DEFMIC IN 2 −HJMIC IN 1 −KLMExternal IN B −NExternal IN A −PRSTB-Mix OUT −UA-Mix OUT −VWXYZTOP ROW 1-22: COMPONENT SIDE · BOTTOM ROW A-Z: SOLDER SIDEInputOutput

Inputs and outputs

M457M457 - Pre-MixerMIC IN 1A1 8 / JMIC IN 2A2 6 / FMIC IN 3A3 3 / CMIC IN 4A4 1 / AExternal IN AB3 12 / NExternal IN BB4 11 / MA-Mix OUTB1 17 / UB-Mix OUTB2 16 / TINPUTSOUTPUTS

Audio connections · RTO-144 A / B

PortSignalDirPin +Pin −Pad +Pad −
A1MIC IN 1in8J8.A.1.PJ.A.1.N
A2MIC IN 2in6F6.A.2.PF.A.2.N
A3MIC IN 3in3C3.A.3.PC.A.3.N
A4MIC IN 4in1A1.A.4.PA.A.4.N
B1A-Mix OUTout17U17.B.1.PU.B.1.N
B2B-Mix OUTout16T16.B.2.PT.B.2.N
B3External IN Ain12N12.B.3.PN.B.3.N
B4External IN Bin11M11.B.4.PM.B.4.N

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
M457 RTO-144 connections
Drn.
make_rto144.py
Date
Oct 17 2026