Operating instructions

INTRODUCTION
The AM8/4 is the most advanced automatic matrix mixer available today. Combining 8 automatic
input channels, 2 auxiliary line inputs channels, 4 output channels, and a full crosspoint matrix
system into 1 rack space, the AM8/4 is a compact solution for a wide variety of sound system
applications. 8 nonvolatile preset memory positions mean complete flexibility and reconfigurability.
The 8 automatic inputs utilize Lectrosonics’ patented Proportional Gain plus Autoskew mixing
algorithm* for seamless automatic mixing performance. Input preamp gains include +50dB and
+30dB for both dynamic and electret microphones, and 0dB for line level inputs. Gain trim range on
the inputs is +15dB to -63dB plus off.
The crosspoint matrix allows any input (or combination of inputs) to be routed to any output (or
combination of outputs). Available crosspoints gains include -6dB, 0dB, +3dB, and off. In addition
to the 8 automatic inputs and 2 line inputs, audio from the LecNet Expansion connector can also be
routed to any or all of the 4 outputs.
The AM8/4 features a wealth of programmable features. With 13 programmable inputs and 8
programmable outputs, even the most sophisticated control schemes are straightforward. The
programmable inputs can control input or output level on any grouping of inputs or outputs, memory
preset recall, or matrix crosspoint switching. Programmable outputs can indicate the current state of
a programmable input.
The AM8/4 has an RS-232 port for remote setup or control by a computer or other RS-232 compat-
ible controller. More than one AM8/4 may be coupled together for larger applications.
TABLE OF CONTENTS
INTRODUCTION ................................................................................................... 2
GENERAL TECHNICAL DESCRIPTION ............................................................. 3
INSTALLATION ...................................................................................................... 4
FRONT PANEL DESCRIPTION............................................................................ 6
REAR PANEL DESCRIPTION .............................................................................. 7
OPERATING INSTRUCTIONS ............................................................................. 8
AM8/4 CONTROL PANEL SOFTWARE ............................................................. 10
TROUBLESHOOTING ......................................................................................... 19
FCC PART 15 NOTICE ....................................................................................... 19
SERIAL CABLE WIRING DIAGRAM ................................................................. 20
AMX CABLE WIRING DIAGRAM ....................................................................... 20
SERIAL PORT COMMANDS AVAILABLE ......................................................... 21
SPECIFICATIONS ............................................................................................... 26
SERVICE AND REPAIR ...................................................................................... 27
RETURNING UNITS FOR REPAIR .................................................................... 27
WARRANTY ........................................................................................... Back cover
U.S. Patents 5,402,500 and 5,414,776
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