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BLACK
BOX
RECORDER
- User Manual v2.2
Linking multiple BlackBox Recorders together
It is possible to link multiple BlackBox Recorders together to make
recordings with more than 24 channels or to make redundant copies by
duplication. Typically up to four units can be linked in this way to create a
maximum of a 96 channel / 96 kHz recording. Each BlackBox Recorder will
still require its own USB2 disk drive as only 24 channels of data will be
recorded to each drive. This will also provide benefits in post production as
many popular DAWs will only play back a limited number of tracks from each
external drive.
As stated earlier in this manual, ensuring that the units are synchronised
with both the clocking and starting sample of each recording being locked
together is vital for being able to replay the material later in a DAW
environment.
The BBR1 achieves this link using the “
Ext Clk
” RCA sockets on the rear
panel. The Master unit will output a clock signal to the other units
embedding the control data and timecode into the sub-code of the SPDIF
data stream. This clock signal is intentionally silent with no audio data
present to ensure that there is a clean feed of clock signals between the
units. The Slave units can either be daisy chained together from the Master
unit or preferably be fed their clocking and control signals from a
distribution amplifier. You will need short RCA (phono) jumper cables to
connect each subsequent unit.
Using an AES/EBU Distribution Amplifier (recommended)
Master
Ext Clk Out
feeds
Distribution Amplifier input
Distribution Amplifier
feeds
Ext Clk In
on
all
slave units
Daisy Chaining Units
Master
Ext Clk Out
feeds
Slave1
Ext Clk In
Slave1
Ext Clk Out
feeds
Slave2
Ext Clk In
Slave2
Ext Clk Out
feeds
Slave3
Ext Clk In
Slave3
Ext Clk Out
not used.