BSS Audio
FCS-930/960 User Manual v3.0
Page 8
Electronically balanced and floating output. Maximum output is +20dBu into
600W. Transformer balancing is available as an option.
The pin connections are:
Pin 1
Ground/chassis.
Pin 2
Hot (+).
Pin 3
Cold (-).
Electronically balanced input. Maximum input is +20dBu into 10kW. Transformer
balancing is available as an option.
The pin connections are:
Pin 1
Open circuit/no connection.
Pin 2
Hot (+).
Pin 3
Cold (-).
Take note of the ground break on Pin 1. As with all BSS products, the convention is
‘screen goes forward with the signal’, giving a useful ground loop break point at
the input connector. The audio lead connected to the input must therefore have its
screen grounded at the signal source end. When using a fully balanced system,
either Pin 2 or Pin 3 may be the HOT terminal.
7 Using the FCS-930/960
The FCS-930/960 Graphic equaliser is the result of a detailed study of sound
engineers and contractors requirements plus many hours of voice and music
program listening tests to carefully optimise the benefits of controlling equalisation
in this ergonomically efficient and familiar manner.
The filter sets chosen are arranged in the alternate summing mode to reduce
interaction, and utilise a multiple-feedback band-pass topology rather than the
more generally used gyrator topology. This assures excellent high frequency fidelity
by placing less demands on the associated electronics. The resulting filter shape is
‘constant Q’ giving a constant bandwidth regardless of the amount of boost or cut
selected. This produces consistent selectivity over the whole range of fader
movement.
The extra long 45mm faders are centre detented for accurate zero setting, as well
as being centre tapped. This electrical centre tap, which is grounded, ensures each
filter set is properly removed from the circuit at the faders central position. This will
give you added confidence during use, as well as reassurance that, if a filter is not
being used, it is absent from the signal path.
Analysis has shown that the filter shape requirements depend to a large extent on
the final application for the equaliser and for this reason the FCS-930/960 is
provided with a MODE selector which re configures the filter sets.
