AMC iAC 120 DSP User Manual page 12

Operation
FAN MODE
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Amplifier cooling is based on fan powered by main CPU. Normally fan rotates at
low speed in order to keep air circulation inside amplifier. User has option to turn off
the fan and makes amplifier noise free. Despite user settings main CPU constantly
measures power amplifier temperature and if heat rise above dangerous threshold
(70°) main CPU temporary overrides user settings and forces fan to cool down
amplifier untill safe temperature is reached. Default "FAN mode" setting – auto.
OUTPUT SETUP
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An iAC amplifier has two kinds of outputs: transformer isolated 100 V / 70 V output,
and Low Z output powered directly from power amp stage. User must setup output
before starting using amplifier. By default amplifier is set for 100 V / 70 V output,
it means that only high voltage output is enabled, also low cut filter is activated.
Please set output mode to LOW Z in order to activate 4 ohm output. In LOW Z
mode high pass filter allows full frequency (20 Hz-20 kHz) range reproduction
while 100 V / 70 V mode limits audio rage to 120 Hz – 20 kHz. LOW Z mode brings
additional option to menu – LOW pass filter. In 100 V / 70 V mode LOW pass filter is
unavailable.
10 USER MANUAL iAC Installation Power Amplifier
OUTPUT SETUP FOR IAC 2X240 DSP
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Two channel amplifiers (iAC 2x240 DSP) can be set to 100 V bridge mode to
combine the power from two output channels to drive a single 100 V audio line. To
enable 100 V Bridge output, a user should set up the amplifier's output mode.
INPUT MATRIX FOR IAC 2X240 DSP
iAC 2x240 DSP amplifier has an option to route any input to any output. This matrix
function allows to use the same audio input on both channels or swap inputs and
outputs for each other. All available settings are listed below.
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STANDBY
Manual: manually mutes amplifier and turns off LCD display to save power.
To exit standby mode turn or push the rotary encoder.
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