Rear Panel
17
Apollo 16 mkII Hardware Manual
(6) Word Clock Out
This BNC connector transmits a standard (1x) word clock when Apollo 16 is set to use its
internal clock. The clock rate sent by this port matches the current system sample rate,
as specified within the Console application.
When Apollo 16 is set to use external word clock as its clock, Apollo 16 is a word clock
slave. If the incoming external word clock is within ±0.5% of a supported sample rate
(44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz), Word Clock Out will mirror
Word Clock In with a slight phase delay (about 40ns).
Because Apollo 16’s word clock output is not a true mirror of the word clock input, word
clock out should not be used to daisy chain the word clock if Apollo 16 is in the middle
of the word clock chain. The correct method to connect Apollo 16 in the middle of a
word clock chain is to use a T-connector at Apollo 16’s word clock input and leave Apollo
16’s word clock output unconnected (the Termination switch should not be engaged in
this scenario).
(7) Word Clock In
Apollo 16’s internal clock can be synchronized (slaved) to an external master word
clock. This is accomplished by setting Apollo 16’s clock source to Word Clock within the
Console application, connecting the external word clock’s BNC connector to Apollo 16’s
word clock input, and setting the external device to transmit word clock. If Apollo 16 is
the last device in the clock chain, the Termination switch (#10) should be engaged.
Important:
Apollo 16’s sample rate must be manually set to match the incoming
clock’s sample rate.
Note: Apollo 16 can be synchronized to an external “1x” clock signal only. Super-
clock, overclocking, and subclocking are not supported.
(8) AES/EBU Ports
The AES/EBU ports provide two channels of digital I/O with resolutions up to 192 kHz
via XLR connectors. For optimum results, use only high-quality 110-ohm XLR cables
specifically designed for AES/EBU digital audio.
SR Convert
Sample rate conversion can be enabled on the AES/EBU input. This function is set in
the AES/EBU input channel strip within the Console application. When sample rate
conversion is enabled and the sample rate of the incoming AES/EBU signal does not
match the sample rate specified in the Console application, the AES/EBU signal is
converted to match Apollo 16’s sample rate.
Note: When Apollo 16 is set to use AES/EBU as the master clock source, sample
rate conversion is inactive.
