Bose FreeSpace IZA 190-HZ Service Manual page 15

PRODUCT DESCRIPTION
Input A/B Selector Switch - Allows you to choose between rear line inputs A and B from the
front panel of the amplifier.Rear line inputs A and B can also be selected remotely with the use of
®
optional Bose Volume Control with A/B Select User Interface accessory.
Note: When the Bose Volume Control with A/B Select User Interface is connected, the source
select on the front panel of the amplifier will not function. The position of the A/B switch on the
user interface will determine what source is selected.
Treble Control - Allows adjustment of the output tone. Provides +/-6 dB of adjustment at 7 kHz.
Bass Control - Allows adjustment of the output tone. Provides +/-6 dB of adjustment at 100 Hz.
Master Level Control - Controls the overall system volume for both the loudspeakers and
the variable AUX OUT. The Master Level can also be controlled remotely with the use of optional
Bose Volume Control User Interface or Volume Control with A/B Select User Interface
accessories.
Note: When the Volume Control User Interface is
connected, the front-panel MASTER LEVEL control
will not function. The position of the volume control
on the User Interface determines overall system
volume.
FreeSpace ® ZA 190-HZ/250-LZ Zone Amplifier
Front Panel Controls and Indicators
®
Note: Front Panel controls and indicators are identical on the FreeSpace ZA 190-HZ amplifier.
Off/On Switch - Turns amplifier on or off.
Power Indicator - Illuminates blue when amplifier is on.
Output Mode Switch (ZA 250-LZ only) - Allows stereo input sources to be output in mono or
stereo. Note: The ZA 190-HZ is designed to sum both inputs channels to mono.
Output Trim Control - Allows for attenuating individual loudspeaker outputs relative to the
Master Level of the connected IZA 190-HZ/250-LZ amplifier. 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.
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