BSS Audio FCS-930/960 User Manual v3.0
Page 4
IMPORTANT: The mains fuse carrier on the rear of the unit must be fitted with the
correct type and rating of fuse, depending on the position of the mains voltage
selector switch:
115V switch position - T250mA fuse
230V switch position - T200mA fuse
In the unlikely event of the mains fuse failing without good reason, please refer to
section 9.2; Transient Suppressor Replacement.
3 Introduction
The FCS-930 and FCS-960 are dual mode graphic equalisers; each channel
featuring 30 filter bands spaced at the standard one third octave ISO frequency
centres, spanning 25Hz at the low frequency end up to 20kHz at the high
frequency end. The FCS-930 is a single channel unit, while the FCS-960 has two
independent channels that may be used as a stereo pair.
The filter topology used is not based on the more common gyrator principle, but
rather on a band pass multiple feedback technique which makes less demands on
the integrated circuits at high frequencies. The resulting excellent sounding circuit
also offers good long term stability and a constant Q response. This is also
configurable to allow you to select the optimum response shape, dependent on
whether you wish to provide gentle program sweetening, or precise single
frequency tuning, such as notching room resonances and feedback suppression.
Some of the features available within the FCS-930/960 are:
• Long 45mm fader travel for precise adjustment and control.
• Centre detented fader with electrical centre tap for true 0dB setting.
• Advanced constant Q filter topology for improved accuracy at all fader
settings and excellent sonic transparency. Selectable normal or fine filter response.
• Continuously variable high pass filter, with bypass switch.
• Gain control for system loudness normalisation.
• Peak clip LED to give advance warning of signal overload.
• Channel bypass selection and power fail bypass by relays.
• Electronically balanced inputs and outputs.
• Proprietary design fader knob provides positive feel with ample finger room,
virtually eliminates visual parallax errors even under low ambient light conditions
• Optional internal input and output transformer balancing.
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