Front Panel
12
Apollo 16 mkII Hardware Manual
Input Channel Meters
When set to INPUT, the channel meters display the signal peak input levels for analog
channels 1 – 16 at the input to the A/D converters. Avoid digital clipping at the
channel’s A/D converter by reducing the output level of the device connected to the
channel’s input.
Output Channel Meters
When set to OUTPUT, the channel meters display the signal peak output levels for analog
channels 1 – 16 at the output of the D/A converters.
(5) Power Indicator (UA Logo)
The Universal Audio logo illuminates when the external power supply is properly
connected to an AC outlet and the power input on the rear of the unit, and the POWER
switch (#9) is in the up position.
(6) Monitor Output Level Meters
The 10-segment LED meters display the signal peak output levels of the rear panel Left
& Right Monitor outputs at the output of the D/A converters. These meters are before the
Monitor Level control (pre-fader) and reflect the D/A converter levels regardless of the
current Monitor Level and Headphone Level knob settings.
The dB values of the monitor meter LEDs are indicated between the left and right
channel meters. When digital clipping occurs, the red “C” (clip) LED illuminates.
If the monitor output level clips, reduce the monitor output level within the DAW and/or
reduce the output level of individual channels feeding the monitor output bus within the
Console application.
(7) Monitor Level and Mute Knob
This rotary encoder serves two functions. Rotating the knob adjusts the monitor output
level, and pressing the knob mutes the monitor outputs.
Monitor Level
Rotating the knob clockwise increases the signal level at the Left & Right Monitor
Outputs on the rear panel. If ALT monitor outputs are configured and active, this knob
controls the signal level at the ALT monitor’s line outputs.
Although this is a digital control, the Left & Right Monitor Outputs volume is attenuated
in the analog domain, after D/A conversion (digitally-controlled analog volume). This
method provides the utmost monitoring fidelity, in contrast to digital volume controls that
reduce levels by truncating the digital word length (aka “dropping bits”).
