Unity gain is used when there is another unit in the system that in an alternative system
configuration (typically multi-channel surround sound) will control gain to the same
channels that the preamplifier is controlling in the two-channel system configuration.
In this case, to achieve proper system volume balance and make gain adjustment more
predictable it is desirable to avoid the need to use two volume controls, and the two
channel preamplifier is set to pass signal through to the amplifiers its is connected to
without gain or attenuation.
User input:
User holds down Mon/Proc button and simultaneously presses the
currently selected input button. Addressable through RS-232 port
also – see specific section for command structure.
Indication:
Volume setting indication changes to UI and mute LED blinks. If
user changes the volume control or presses volume up or down
button on remote control the volume indicator does not change. If
the user selects another input, (whether or not set for unity gain), the
mute function turns on and the mute LED blinks, and if the new
input is not set for unity gain the unit displays the volume setting.
User must explicitly press the mute button to get out of the mute
mode, as the volume up does not release mute.
If there is no reaction to the front panel unity command then the
unit is in lockout mode and must be unlocked before setting.
Status:
Unit is in muted mode and volume does not change from unity gain
after user un-mutes unit. Volume, input offset, balance, phase and
tape monitor functions are inactive for the unity gain input.
Whenever the user selects the input that is in unity gain mode, the
mute function is turned on again and the mute LED blinks. User
has to explicitly un-mute to use that input. If there is no reaction to
the unity command (indicating that the unit is in lockout mode) then
no change is made.
12. User changes input selection (Remote or Front Panel)
As a control center, the preamplifier must be able to switch between different source
components connected to different inputs.
User input:
User selects an input by pressing input button, either on front panel
or remote control.
Indication:
The LED for the new input is lit and the LED for the previously
selected input switches off. The numeric volume display does not
change, unless the input selected is programmed as a unity gain pass-
through. If the input is set as a unity gain pass through then the
display shows UI and the mute LED blinks. If there is no reaction
then the input is disabled and must be enabled before selecting.
Status:
New input is selected and the previously selected input is de-
selected. The numeric volume display does not change, and the
actual gain setting is determined by the offset programmed by the
user for that input. If the input is set as a unity gain pass through
TL5.5 SERIES II Preamplifier Owner’s Manual
VTL
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