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towards the back. Two m920’s can be mounted side
by side in a standard 1U rack tray. Use the supplied
#10-32 x 3/8” machine screw. Do not use a screw
longer than 3/8”.
Powering up the m920
POWER CONNECTIONS
The disconnect device for the m920 system is the
mains plug or the appliance coupler on the power
supply cord. The disconnect device must remain
accessible and operable. The power supply cord sup-
plied with the m920 must be connected to a mains
outlet with a protective earthing connection.
CHECK LINE VOLTAGE SETTINGS
The IEC power entry module has been set from the
factory to operate at the voltage required for your
part of the world. However, it’s important to double-
check this in order to ensure no damage will come
to the unit if power is applied and the setting is
incorrect.
LINE VOLTAGE SELECTOR
To change the line voltage, remove the AC power
chord from the power inlet then use a small screw-
driver to pry the fuse carrier out. Remove both fuses
from the fuse carrier and replace with the proper
value fuse from the fuse chart below. Carefully
remove the grey colored fuse holder and re-insert
it into the fuse carrier with the proper line voltage
showing through the small window. Note that time
delay or “slow blow” fuses are required.
Voltage and Fuse information
CAM SETTING
LINE VOLTAGE
FUSE VALUE
110V~
100-120V~
250V~ T 250mA L
220V~
220-240V~
250V~ T 125mA L
fuse value table
AC POWER CORD
Connect the supplied AC cord to the iec
power entry module on the rear panel
of the m920. For safety, it is recom-
mended that the cable be connected to
a
grounded
outlet.
LOW VOLTAGE DETECTION
The m920 will automatically detect a low line volt-
age condition. In the event that line voltage drops
below 85 VAC (for 100 -120 VAC) or 170 VAC (200
– 240VAC), the m920 will switch into low voltage
detection mode. In this mode both headphone and
line outputs are muted, and the 7 segment led will
begin to flash. The m920 will automatically return to
the previous operating state when proper line volt-
age is restored.
POWER-UP SEQUENCE
The m920’s headphone outputs are protected
from any popping when the unit is turned on or off.
However, if you are using the line outputs, observ-
ing proper power sequencing is recommended to
avoid any potential popping in your speakers. Before
powering up your m920, make sure your monitor
speakers or power amps connected to your moni-
tors are turned OFF. Once the m920 and the rest of
your audio system are powered up, then turn on the
power to your speakers or amplifiers. When powering
down, first power OFF your speaker system and / or
power amps and then power down the m920.
Turn
power amps on last, turn them off first!
Input Connections
The input / output / interface connections high-
lighted earlier in this manual are detailed below.
Please contact us if you have any questions regarding
cable terminations or pinout specifications.
BALANCED ANALOG INPUTS
The balanced stereo an-
alog input is provided via female XLRs. Connection is
made using standard balanced XLR cables. This input
is wired pin 1 shield, pin 2 positive pin 3 negative.
UNBALANCED ANALOG INPUT
This stereo input is
provided for interfacing with consumer level (-10dBv)
unbalanced analog sources. Connections are made
using standard RCA cables.
AES3 DIGITAL INPUT
The stereo AES3 input is pro-
vided via one female XLR connector. This conforms
to the AES3 standard. Use of high quality 110 Ohm
balanced cable is highly recommended.
S/PDIF COAXIAL INPUT
Standard coaxial stereo
digital input. The input impedance is 75 Ohms. Use a
