Graham-Patten SoundPals, Руководство пользователя

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22 • ADC-20 SoundPals User's Guide
ADC-20 Installation
This section provides instructions for connecting power, analog inputs,
AES reference, and digital outputs.
NOTE
For information on rack mounting the DAC-20 with
the optional rack tray, refer to Appendix C.
Connecting Power
Plug a 6 VDC power supply into the appropriate voltage outlet for your
specific country , and connect the end of the cord into the ADC-20 jack
marked
+6V
. Secure the locking ring finger tight. The green LED below
the jack lights when power is applied.
Connecting Inputs
Connect left and right channel analog inputs to the two rear connectors
marked
LEFT IN
and
RIGHT IN
. Balanced sources are connected to
pins 2 (
+
ve
) and 3 (
− ve
) with pin 1 and the shell grounded. Unbalanced
sources are connected to pin 2 with pins 1, 3 and the shell grounded.
Refer to the “
ADC-20 Operation ” section for instructions on correctly
adjusting input level.
Connecting AES Reference
The ADC-20 can be synchronized to an alternate output frequency
(from the default frequency) by connecting a valid AES reference signal
to the
AES REF BNC connector. The EXT REF LED on the front
panel lights when a valid reference signal is applied.
To phase lock the unit’s sample frequency to a reference, connect a
reference signal (between 30 kHz and 50 kHz sampling rate) to the
AES
REF BNC connector. The AES signal output will now phase-lock to the
incoming reference — independent of the ADC’s default reference
frequency.
Note that the AES REF input is normally terminated internally with 75
Ω
. When it is necessary to loop reference to several SoundPals, the
signal must be terminated only once, and always at the last unit in the
chain. Refer to the “
ADC-20 Internal Jumpers ” section for information
on changing the input from terminating to bridging.