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Apollo FireWire Hardware Manual Rear Panel

The ADAT port channel assignments described above are summarized in this table:

ADAT PORT CHANNEL ROUTING

Sample Rate (kHz)

Input Port 1

Input Port 2

Output Port 1

Output Port 2

44.1 & 48

1 – 8

Disabled

1 – 8

1 – 8 (mirror of port 1)

88.2 & 96

1 – 4

5 – 8

1 – 4

5 – 8

176.4 & 192

1 – 2

3 – 4

1 – 2

3 – 4

Note: The ADAT ports use TOSLINK JIS F05 optical connectors. Some devices use this type of connector for

optical S/PDIF connections. However, Apollo’s ADAT ports do not support the S/PDIF protocol.

(7) S/PDIF Ports

The S/PDIF ports provide two channels of digital I/O with resolutions up to 24-bit at 192 kHz via female phono

(RCA) connectors. For optimum results, use only high-quality 75-ohm cables specifically designed for S/PDIF

digital audio.

Sample rate conversion can be enabled on the S/PDIF input; this setting is in the Console application. When the

sample rate of the incoming S/PDIF signal does not match the sample rate specified in the Console application,

the S/PDIF signal is converted to match Apollo’s sample rate. If Apollo is set to use S/PDIF as the master clock

source, sample rate conversion is inactive.

The S/PDIF output can be configured to mirror the Monitor outputs, for patching the stereo Monitor signal to the

stereo S/PDIF input of other devices. This function is configured in the Console application.

(8) Word Clock In

Apollo’s internal clock can be synchronized (slaved) to an external master word clock. This is accomplished by

setting Apollo’s clock source to Word Clock within the Console application, connecting the external word clock’s

BNC connector to Apollo’s word clock input, and setting the external device to transmit word clock. If Apollo is

the last device in the clock chain, the Termination switch (#10) should be engaged.

Important: Apollo's sample rate must be manually set to match the incoming clock's sample rate.

Note: Apollo can be synchronized to an external “1x” clock signal only. Superclock, overclocking, and

subclocking are not supported.

(9) Word Clock Out

This BNC connector transmits a standard (1x) word clock when Apollo 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 is set to use external word clock as its clock, Apollo 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’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 is in the middle of the word clock chain. The correct method to

connect Apollo in the middle of a word clock chain is to use a T-connector at Apollo’s word clock input and

leave Apollo’s word clock output unconnected (the Termination switch should not be engaged in this scenario).

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