Cirrus Logic CRD44800-ST-FB - Manual (Page 5)

CRD44800-ST-FB
5
6) Connect loudspeakers to the speaker output terminals. The Red terminal is speaker positive,
and the Black terminal is speaker negative. Note that in a full-bridge system like the
CDRD44800-ST-FB, neither speaker terminal is grounded. As a result, speaker switch boxes
with common negative terminals should not be used.
Turn the volume control fully counterclockwise and apply power using the power switch on the
power entry module. The Fault and Mute LEDs will both light briefly as the system is initialized.
Note that if either the Coax or the Optical input is selected, a valid digital signal must be provided
to the selected input so that the CRD44800-ST-FB can complete initialization. If a valid signal is
not present at the selected input, both the Fault and Mute LEDs will remain lit.
If one of the stand-alone modes is selected, the amplifiers should now be operating. Slowly ad-
vance the volume control clockwise until the desired volume is achieved. The MUTE pushbutton
(S2) may be used to mute and unmute the audio output. The RAMP UP/DN pushbutton (S3) will
enable or disable switching on the PWM back end.
Note that in the stand-alone mode, several system faults are indicated by the lighting of the red
Fault LED, D19. Typical causes for fault conditions are short circuited speaker outputs, thermal
shutoff of the power back end, or lack of a S/PDIF signal when either of the S/PDIF inputs is se-
lected.
Remote Operation
The CRD44800-ST-FB may also be operated remotely via the Cirrus FlexGUI for complete con-
trol of all the features of the CS44800. Note that the Fault and Mute LEDs operate differently in
the remote mode. They indicate the selected audio signal input as explained below. Follow the
procedure below to set up remote operation.
1) Attach the supplied power cord to the power entry module. Do not turn on the power yet.
2) Configure jumpers J17 and J18 for remote operation. Jumpers J17 and J18 should have pins
2 and 3 connected for remote operation. Jumpers J6 and J7 should be removed completely.
3) Turn on the AC power. Press the Reset button on the driver board. Select the desired audio
input source by pressing the Mute button. The following table shows the inputs selections:
Selected Input Mute LED Fault LED
Analog Inputs On Off
Optical S/PDIF Off On
Rx Lx Rs Ls S C R L
Figure 1. Speaker Terminal Configuration