Manual CC2 © Grimm Audio
10
customers that in some cases devices do lock to a word
clock signal when terminated, but their sound quality is
improved when unterminated. So our advice is to
experiment with it yourself on your own device.
The output impedance of the CC2’s may need to be set
“low” in some cases. For instance, a parallel-terminated
input expecting a 4V input signal will only work with the
CC2’s output impedance set low. A fair number of
products were found to have parallel terminated input
but stop working around 2.5V which is why the CC2 puts
out a slightly higher-than-normal voltage in order to
allow correct operation in the factory preset mode.
Nevertheless, some equipment will only respond
correctly when the output impedance switch is set to
low.
Connection
The CC2 has two word clock outputs. Each device
connected to the CC2 should be set to slave to word
clock. The preferred system wiring is ‘star distribution’
where each output of the CC2 connects to one device.
Daisy chain connections using T-junctions should be
avoided where possible. The latter will most likely fail
because of the lack of standardisation of termination
impedance and signal levels. In case you need more
word clock outputs, consider to buy our CC1 clock
distributor, which has 16 outputs.
Use 75 ohm coaxial cables with a low transfer
impedance. Since word clock is an unbalanced
connection, noise currents generated by earth loops will
flow through the BNC cables and any series impedance
in the connection can cause interference. The CC2 has a
low-impedance reference plane at the rear, insuring that
it will never be affected by circulating currents. By all
means, never defeat the safety earth connection of any
device that is designed to have an earth connection.
Lifting grounds may produce a lethal shock hazard and
will likely lead to unwanted high currents through coax
shields.
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