user manual

7
LED Indicators
LED metering of both input and output are provided.
Input metering is indicated as relative to 0 dBfs (digital
clipping of the input signal) and output metering is indi-
cated in actual output voltage levels in dBu. Meters are
peak-reading and updated every 50 milliseconds.
The lower input metering LEDs will remain illuminated
as successively higher levels are indicated. When 0
dbfs is reached, ONLY the upper red LED will illuminate
(lower LEDs will extinguish). If 0 dBfs is indicated often,
reduce input signal level to the SC28. This will reduce
possibly audible distortion caused by clipping the digital
input of the SC28.
The output meters indicate the actual output voltage
level in dBu (0dBu=0.775Vrms). Most QSC amplifiers
clip/limit at about +4 dBu input level.
LCD Display and Control (Rotary Encoder)
The SC28 has a 2 line X 16 character LCD display. The
display and the push-to-select rotary encoder knob pro-
vide data access and editing capability. The rotary
select/accept knob is active for most displayed items
allowing you to scroll through choices by rotating the
control, and accepting choices (entering) by pushing in
on the control.
The accessible menus and sub menus may appear dif-
ferently than example shown. Software updates may
occasionally improve the interface. On the following
pages are shown the basic navigation flow for the SC28
menu system; Setup, EQ, Gain, and Utility.
Notes:
When editing parameters such as Gain or Filter Fre-
quency, turning the knob more quickly (i.e. “spinning”)
will accelerate the parameter’s change.
LCD Icon key:
Loudspeaker protection/clip limiting is active
Turning the knob to the right will increment
the current selection
Turning the knob to the left will decrement
the current selection
Pressing knob will enter sub-menu or allow
the current selection to be edited
Input metering for the SC28- Note digi-
tal clipping will be indicated by ONLY
the top red LED being illuminated.
Output metering for the SC28- Meters
indicate actual voltage level in dBu
for each output. +4 dBu is maximum
input level for most QSC amplifiers.
LCD display of the SC28- Typical loud-
speaker configuration parameters
shown.
Control knob (rotary encoder)- Adjust-
able parameters can be changed by
rotating the knob and accepted/
selected by pushing in on the knob.