7
5.3. Input signal connections
The signal input connectors are of XLR-3 and EUROBLOCK (15, 16, 17, 18) and
electronically balanced. The pin assignment is as follows:
XLR-3
EUROBLOCK
Hot or direct signal
>
Pin 2
+
Cold or phase inverted signal
>
Pin 3
-
Ground
>
Pin 1
Ground
For unbalanced connections, ground the pin 3 on the XLR or the negative terminal on
the Euroblock.
In balanced mode, the input impedance is greater than 20k
(10k
unbalanced),
allowing you to connect a large number of stages in parallel without compromising the
sound quality.
5.4.
Operation in low / high impedance and subsonic filter
The MODE switch (located on the rear) is able to change the operation mode of the
amplifier outputs in addition to enable / disable the subsonic filter. The operation is the
one described in the following table:
Operation mode
Filter (50Hz 3rd
Butterworth)
Ouputs
Low impedance (LoZ)
Disabled
LoZ only
High impedance (HiZ)
Enabled
HiZ and LoZ
If the switch is set in LoZ position, the high impedance outputs are not activated. If the
switch is set in HiZ position, both the high and low impedance outputs work, in addition,
the 3rd order Butterworth filter will be activated at 50Hz in both outputs.
