Bose FreeSpace IZA 190-HZ Service Manual page 14

PRODUCT DESCRIPTION
Aux Out EQ – Aux Out Flat
Determines if Aux Out will have selected loudspeaker EQ preset applied to it or not. Allows for
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optimization of FreeSpace DS 16 and DS 40 loudspeakers when used with additional zone
amplifiers.
Loudspeaker EQ Preset Switch
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Provides loudspeaker equalization presets designed to optimize the performance of Bose
FreeSpace DS 16 or DS 40 loudspeakers. A high-pass filter (HPF) setting is also available for
use with any passive loudspeakers. the high-pass filter is set at 60 Hz for the IZA 190-HZ and at
40 Hz for the IZA 250-LZ.
The selected EQ preset (HPF, DS 16, DS 40) can be sent to an additional zone amplifier via Aux
Out if "Aux Out EQ" is selected with the corresponding mode DIp switch.
Page Input Gain Control
Allows for fine-tuning page input levels. If the front-panel Input CLIp indicator is red, reduce the
input gain. the adjustment range is 0 dB to +50 dB.
Line Input Gain Control
Allows for fine-tuning of Input A/B levels. If the front-panel Input CLIp indicator is red, reduce the
input gain. The adjustment range is –20 dB to +20 dB.
Output Trim Control
Allows for attenuating individual loudspeaker outputs relative to the Master Level. the adjustment
range is –20 dB to 0 dB. This feature is helpful when one output is powering loudspeakers that
need to be set at a lower volume level than loudspeakers on other outputs – including the outputs
of an additional zone amplifier.
Operation – Front Panel Controls and Indicators
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Note: Front panel controls and indicators are identical on the FreeSpace IZA 190-HZ amplifier.
Off/On Switch - Turns amplifier on or off.
Power Indicator - Illuminates blue when amplifier is on.
Input Clip Indicator - Illuminates red whenever input source approaches the threshold value of -
3dBFS. If the indicator illuminates frequently, reduce input signal level.
Mic/Line Input Gain Control - Allows for fine-tuning of the MIC/LINE input level. If the INPUT
CLIP indicator is red, reduce the input gain. The adjustment range is 0 dB to +50 dB.
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