Aphex 320D Compellor - Manual (Page 17)

320D
Compellor
Page 16 Page 17
when in Bypass, the Compellor cannot feed the analog input to the digital output. The digital
output will simply go dead with no carrier. There is no practical way to avoid this.
NOTE: Because the digital I/O is inherently a stereo interface (two channels on one
AES/EBU connection), the Model 320D must have both bypass switches set to Bypass
in order to get the digital I/O to go into bypass. The analog I/O will bypass on a per
channel basis, however.
6.6 Sample Rates
The 320D accepts any sample rate from 32kHz to 96kHz. If there is no digital input present,
the 320D will automatically sync to it’s own internal clock frequency, giving the possibility of
having an analog input and a non house-synchronized digital output.
With no AES3 input present, the 320D defaults to an internal crystal clock to determine the
self-generated AES3 sample rate. The rate is fixed and not selectable. However, the crystal
can be changed by the user to obtain the desired sample rate. The 320D comes with the
48kHz crystal already installed and a kit of extra crystals for the sample rates of 32, 44.1, and
96kHz is packed inside each 320D. If you need to change the 320D’s default sample rate,
use the following procedure to change the crystal.
6.7 Changing The Crystal
a. Make sure the power cord is unplugged and the unit has been off for several minutes.
b. Remove the top cover from the chassis and locate the crystal kit packed packed inside.
c. Locate the digital audio interface board as shown in figure 6.1.
d. Locate the crystal Y2. It’s wire pins are inserted into socket receptacles on the board and
the case is held in place with a dab of silicone glue.
e. Carefully pull the crystal out of the socket. If necessary, cut or peel off the glue to release
the crystal. Clean any residual glue from the pc board.
f. Insert the new crystal until it is fully seated in the pin receptacles. Add a dab of silicone glue
to hold it in place. Refer to Table 6-1 to select crystal frequencies.
NOTE: DO NOT USE SUPER GLUE. IT MAY RUN DOWN THE PINS AND RENDER THE
OSCILLATOR INOPERABLE.
Fig 6.1
Location of Y2 Crystal
Sample Rate
kHz
32.0
44.1
48.0
96.0
Frequency
mHz
Table 6-1 Crystal Frequencies
8.1920
11.2896
12.2880
24.5760