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How to Operate
Power On
The LED STANDBY/ON Indicator illuminates to
indicate the MI128 is connected to AC
Power. To switch ON the MI128, press
the POWER Push-button on the Front
Panel or switch On the Audio Source
Component providing there is a Power
Control Cable Connection to the MI128.
Refer to figure 20.
Notes: 1. It will take about 6 seconds for initialization of
the internal circuitry to take place on the MI128
when switched On.
2. There must be a power control connection be-
tween the MI128 and the Audio Source Compo-
nent in order for the Remote Control Operation
Power ON/OFF to function.
3. When the MI128 is receiving a Power Control
ON Signal, the Front Panel POWER Push-But-
ton becomes inactive.
Auto Off Function
The MI128 incorporates Power Save Circuitry to
automatically place the MI128 into the power saving
Standby Mode approximately 10 minutes after there
has been an absence of an audio input signal on all
eight channels.
When there is a Power Control Connection be-
tween the MI128 and a Preamplifier or Source Com-
ponent, the AUTO OFF Function is bypassed.
Channel Operational Indication
The MI128 Front Panel has eight LEDs. The LEDs
indicate the current functioning status for each of the
eight channels.
MI128 Channel Operation Functions
LED COLOR
LED not
Indicates when the Channel is OFF
Illuminated
Green
Indicates when the Channel is ON with an
Audio Signal Present and Normal Operation for
Figure 20
the Channel exists
Amber
Indicates when maximum Power Output for the
Channel has occured with prevention of Audio
Clipping
Red
Indicates current limit or short circuit for the
Channel Loudspeaker Output Connection
Volume Controls
Each of the eight MI128 Power Amplifier Channels
have a VOLume Control to
allow altering the incoming
audio signal volume level.
Refer to figure 21.
Input Selector
Each pair of the eight Power Amplifier Channels
(1&2, 3&4, 5&6 and 7&8) have switches located on
the MI128 Rear Panel for selection of the Input Source
Signal and determine the Audio Signal Mode. Refer to
pages 6 and 7 for additional information.
The LOCAL-BUS Switch determines for the
Power Amplifier Channels (1&2, 3&4, 5&6 and 7&8)
if the Audio Signal will be from the
Unbalanced Left and Right Input
Jacks or from the BUS Analog/Digi-
tal Input Connectors. Refer to figure
22.
Functional Status
Figure 21
Figure 22
When the LOCAL-BUS Switch is placed in the
BUS Position the selection of the Audio Signal Input
for the Power Amplifier Channels (1&2,
3&4, 5&6 and 7&8) is determined by the
"1-2-D1-D2" Selector Switch. Refer to
figure 23.
The 1 and 2 Selector Switch Positions
are for the Analog Signals from the BUS1/BUS2 Left
and Right Input Jacks for the Power Amplifier Chan-
nels.
The D1 Switch Position allows the Digital Au-
dio Signals from the DIG1 Optical or Coaxial Input
Connector to be available for the Power Amplifier
Channels. The D2 Switch Position performs the same
functions from the DIG2 Optical or Coaxial Input
Connector.
Mode Selector
Each pair of the eight Power Amplifier Channels
(1&2, 3&4, 5&6 and 7&8) have a Mode Switch located
on the MI128 Rear Panel for STEREO or MONO
Mode of Operation. Refer to
figure 24. The Mode Switch
affects all three of the Ana-
log Input Pairs. It also affects the Digital Optical or
Coaxial Input Audio Signal.
How to Operate
Figure 23
Figure 24
13
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