Buzz Audio soc-20 mid side optical compressor - Manual (Page 3)

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1] Installation Precautions
The SOC-20 compressor uses discrete Class A amplifiers and these plus the
power supply do generate a fair amount of heat. Normally the SOC can be
mounted into a rack without any special ventilation need. If there are other
units in the rack that also run hot, it may be necessary to allow for ventilation
gaps between the units to avoid over heating. Excessive heat for long periods
can shorten the life of all electronic devices.
2] The Mains Input
The SOC-20 mains input can be set to run from 110V or 230V. On the rear
panel you will find a circular voltage selector switch to set this. Generally the
SOC mains voltage is set for the country to which it has been initially sent, but
before powering up the unit, please check the voltage selector.
POWERING UP THE SOC WITH THE WRONG VOLTAGE SETTING MAY CAUSE
BURN OUT OF THE POWER TRANSFORMER!
It is also important to fit the correct mains fuse. Below the IEC inlet you will see
the fuse draw. Using a small flat blade screwdriver, you can flick open the
draw and change the fuse if required. The fuse draw also has a place to hold
a spare fuse (the square tube).
The correct fuses are;
110V = 2 amp slow blow
230V = 1 amp slow blow
These fuses will either be fitted in the fuse draw, and/or supplied in an
accessory bag with the SOC.
3] Audio Connections
On the rear panel of the SOC you will find the XLR input and output connectors.
All these connectors are wired as follows;
Pin 1 = Chassis Ground
Pin 2 = Signal + (hot)
Pin 3 = Signal – (cold)
Note that the pin1 connection of these connectors is not part of the audio path,
and is provided to shield the interconnecting cable. Leaving pin 1 free at one
end of the cable can help reduce earth loops with other equipment as only the
signal hot and signal cold are required.
Generally speaking, keeping the signals balanced is a good idea, but all the
inputs and outputs of the SOC-20 will accept unbalanced lines and signals if
you have no other choice.