Quantum, Appendix c, Possible clock modes – dbx Pro QUANTUM User Manual
Page 78: C.1 clock modes, Midi clock info
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Appendix C
QUANTUM
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QUANTUM User Manual
With digital inputs, clocks are recovered from the incoming sample stream. For example, if you have a few different
units digitally connected by S/PDIF, digital transfers may induce jitter into the audio stream. Syncing multiple pieces of
digital equipment to a master clock reduces the jitter between them. Keeping jitter to a minimum allows for maximum
fidelity. This is essential for accurate monitoring at different points along the chain.
With an analog input and downstream digital units, using the QUANTUM as a master clock will keep the digital signal
accurate. While the differences in jittery sync without a master clock may be miniscule, it is better to reduce the vari-
ables in favor of accuracy. Running a master clock that all downstream digital units sync to is just a good idea. Make
sure that when you are using the SuperClock modes you are on the correct settings (SC 44.1, SC 48, etc.) these settings
are designed especially for SuperClock. If these settings are not used, syncing errors will occur. The following chart
shows the possible clock modes.
C.1 Clock Modes
1. Analog In
44.1
48
88.2
96
Int Xtals
44.1
48
88.2
96
AES sync
44.1
48
88.2
96
Word
44.1
48
SC44.1, SC48,
2. Digital in - AES
44.1 48
88.2
96
AES sync
44.1 48
88.2
96
Word
44.1 48
SC44.1,
SC48,
3. Digital In - SPDIF
44.1 48
88.2
96
SPDIF sync
44.1 48
88.2
96
Word
44.1 48
SC44.1,
SC48,
4. Digital in - SRC - Int Xtals
96-> 48
96 -> 44.1
88.2-> 48
88.2 -> 44.1
48 -> 44.1
44.1-> 48
5. Digital in - SRC - Word
96-> 48
96 -> 44.1
88.2-> 48
88.2 -> 44.1
48 -> 48
48 -> 44.1
44.1-> 48
44.1-> 44.1
6. Digital in - SRC - SC44.1, SC48
96-> 48
96 -> 44.1
88.2-> 48
88.2 -> 44.1
48 -> 48
48 -> 44.1
44.1-> 48
44.1-> 44.1
7. Analog in - SRC - AES Sync
96-> 48
96 -> 44.1
88.2-> 48
88.2 -> 44.1
48 -> 48
48 -> 44.1
44.1-> 48
44.1-> 44.1
8. Analog in - SRC - Word
96-> 48
96 -> 44.1
88.2-> 48
88.2 -> 44.1
48 -> 48
48 -> 44.1
44.1-> 48
44.1-> 44.1
9. Analog in - SRC - SC44.1, SC48
96-> 48
96 -> 44.1
88.2-> 48
88.2 -> 44.1
48 -> 48
48 -> 44.1
44.1-> 48
44.1-> 44.1
Possible Clock Modes
MIDI Clock Info