Hardware manual

Apollo Hardware Manual Front Panel
11
(10) Preamp Options LEDs
These seven LEDs display the state of the preamp option button settings for the currently selected channel.
Each LED is illuminated when its associated option is active. When the channel selection is changed, the LED
states are updated to reflect the current settings for the selected channel.
(11) Channel 1 – 4 Select LEDs
The currently selected channel is indicated by the LEDs above input level meters 1 – 4. When a channel (or
channels, when stereo linked) is selected, its associated LED is illuminated. The currently selected channel is
incremented when the Preamp Knob (#2) is pressed.
Note: The numbers for channels 5 – 8 do not illuminate.
(12) Input Level Meters
The 10-segment LED meters display the signal peak input levels for analog channels 1 – 8 at the input to the
A/D converters. The dB values of the input meter LEDs are indicated between the meters for channels 4 and 5.
When digital clipping occurs, the red “CLIP” LED illuminates. Avoid digital clipping at the channel’s A/D
converter by reducing the channel’s input level at its source, and/or in the case of channels 1 – 4, by reducing
the preamp gain or engaging the Pad (#7) and readjusting gain as needed.
(13) Power Indicator (UA Logo)
The Universal Audio logo illuminates when the external power supply is properly connected to the AC outlet and
the power input on the rear of the unit, and the Power switch (#22) is in the up position.
Clock LEDs
The Internal (“INT”) and External (“EXT”) Clock LEDs indicate the source and status of the system master clock.
The clock source is specified within the Console application.
(14) Internal Clock
When Apollo is using its internal clock as the master clock source, the Internal Clock LED is solid green. When
set to external clock, this LED is not illuminated.
(15) External Clock
When Apollo is set to use an external clock as the master clock source and a valid clock signal is detected at
the specified port, the External Clock LED is solid green. Apollo can be configured to use an external clock from
the Word Clock, S/PDIF, or ADAT inputs. When set to internal clock, this LED is not illuminated.
If the External Clock LED is red, Apollo is configured to use an external clock but it cannot lock to the clock
source and/or sample rate specified in the Console application.
Important: Apollo's sample rate must be manually set (in the Console application) to match the incoming
clock's sample rate.