BSS Audio FCS-960 User Manual
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BSS Audio FCS-960 User Manual

Dual mode graphic equalizer dual mode two channel graphic equalizer
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V2.2 8 December 1995
Welcome to the FCS-930/960 Users Manual
FCS-930
FCS-960
This Manual is the COPYRIGHT of BSS Audio. All reproduction and copying, other than for the legal
owner's personal use, or disclosure of part or whole to a third party, without prior written authorisa-
tion, is in violation of the European Copyright Convention. BSS Audio 1995
DUAL MODE GRAPHIC EQUALISER
DUAL MODE TWO CHANNEL GRAPHIC EQUALISER
The aim of this manual is to assist sound engineers, installers and
consultants to fully understand the FCS-930/960; and to benefit from its
maximum capability. As opposed to most manuals, the contents can be
read like a book.
At the same time, the information is structured under a series of broad
headings for easy access. So where possible within each section:
. The most immediate information appears at the head of each section
under the main title.
. As you read further into each subsequent section, more
detailed,specific information is given.
Should you have any comments or questions about applying the FCS-
930/960 series within your application, please write to us at the address
in the warranty section.
FCS-930 FCS-960
User's Manual
Welcome
1

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  • Page 1 FCS-930 FCS-960 User's Manual This Manual is the COPYRIGHT of BSS Audio. All reproduction and copying, other than for the legal owner's personal use, or disclosure of part or whole to a third party, without prior written authorisa- tion, is in violation of the European Copyright Convention. BSS Audio 1995...
  • Page 2 FCS-930/960 This equipment has been tested and found to comply with the following European Standards for Electromagnetic Compatibility. Emission Specification EN55013 1990 (Associated equipment) Immunity Specification EN50082/1 1992 (RF Immunity, Fast Transients and ESD) Mains Disturbance EN61000/3/2 1995 For continued compliance ensure that all input and output cables are wired with cable screen connected to pin 1 of the XLR.

  • Page 3: Table Of Contents

    Table Of Contents Table Of Contents Introduction Unpacking Mechanical Installation Connections AC Voltage Setting Safety Earthing AC Power Fusing Audio Connections Ground Loop Control Powering Up Control Descriptions Front Panel Rear Panel Using the FCS-930/960 Filter Shapes and Interaction Effects Appendix Chassis/0v Link Removal Transient Suppressor Replacement...

  • Page 4: Introduction

    FCS-930/960 Introduction 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.

  • Page 5: Unpacking

    Unpacking Unpacking As part of BSS AUDIO's system of quality control, this product is carefully checked before packing, to ensure flawless appearance. After unpacking the unit, please inspect for any physical damage and retain the shipping carton and all relevant packing materials for use should the unit need returning.

  • Page 6: Mechanical Installation

    FCS-930/960 Mechanical Installation Mechanical Installation A vertical rack space of 2U (3.5", 88.9mm) for the FCS-930, and 3U (5.25", 133.4mm) for the FCS-960 is required. You must support the unit at it’s rear by additional bracing or shelving if it is to be used in a transportable system.

  • Page 7: Connections

    Unpacking Warranty Warning Connections Before connecting your unit to its AC power source, check that the voltage selector switch located on the rear panel is correctly set. See figure 2. WARNING: THIS APPLIANCE MUST BE EARTHED. IMPORTANT: The wires in this mains lead are colour coded in accordance with the following code: Green and yellow : Earth...

  • Page 8: Ac Voltage Setting

    FCS-930/960 AC Voltage Setting Safety Earthing AC Power Fusing 4.1 Voltage Setting The mains voltage selector switch provides simple, external adjustment for operation on all international AC power standards. At each switch position there is an acceptable tolerance over which the performance of the unit will not be affected and this is 90v-132v for the 120v position, and 190v-264v for the 240v position.

  • Page 9: Audio Connections

    Audio Connections 4.4 Audio The FCS-930/960 audio inputs are RFI filtered and electronically balanced, with the outputs electronically balanced and floating. They are Connections designed to operate at any signal level up to +20dBu and will drive into loads of 600 ohms or greater. They will be ‘fuss free’, regardless of your installation’s complexity.

  • Page 10: Ground Loop Control

    FCS-930/960 Ground Loop Control Powering Up Strict adherence to the wiring conventions noted above within a fully 4.5 Ground Loop balanced signal system will yield the best possible results with none of Control the problems normally associated with interconnected audio equipment. Wherever possible, cable screens should not be connected to any signal pin, but rather left to perform a cable shielding function only.

  • Page 11: Control Descriptions

    Control Descriptions Front Panel Control Descriptions 5.1 Front Panel Filter boost and cut fader control. Move this fader to vary the amount of boost or cut required, at the frequency of the fader. It has a centre detent and electrical centre tap which guarantees you a precise ‘flat’...

  • Page 12: Rear Panel

    FCS-930/960 Rear Panel 5.2 Rear Panel Mains power fuse is 20mm long and rated at T250mA for 120V voltage setting and T200mA for the 240V voltage setting. For continued protection, please always replace this fuse with the correct value. Mains power switch. Mains voltage selector switch allows operation from 90V-130V or 190V-250V.

  • Page 13: Using The Fcs-930/960

    Using the FCS-930/960 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.
  • Page 14 FCS-930/960 Using the FCS-930/960 In general you would use this mode where amplitude cuts are primarily being introduced. It still however, has many applications for sweetening work as the combining response is still acceptably ripple free. This third order variable filter sweeps from 20Hz to 250Hz at 18dB/oct High Pass Filter and provides extra equalisation in applications where precise control is required on...

  • Page 15: Filter Shapes And Interaction Effects

    Filter Shape and Interaction Effects Filter Shape and Interaction Effects Graphic equalisers have tremendous value in their ability to modify the amplitude response of a sound system. They have become the most widely used type of equaliser product for the general sweetening of a sound system, as well as for more precise work in helping to remove unwanted resonances in a reverberant room or removing feedback in stage monitoring systems.
  • Page 16 FCS-930/960 Filter Shape and Interaction Effects ment of it’s sharpness or selectivity, and the boost/cut shape is sym- metrical about the 0dB line. Fig 7. Conventional and Constant Q Response Curves CONVENTIONAL CONSTANT Q Fig 8. Adjacent Fader Interaction Curve A: Single Fader at +6dB Curve B: Two Faders, +6dB/3dB GENERAL GYRATOR DESIGN FCS-930/960 NORMAL MODE...
  • Page 17 Filter Shape and Interaction Effects Fig 7. shows the effect on selectivity as different levels of boost (or cut) is applied, for conventional equaliser filters and for the constant Q type used in FCS-930/960. The improvement in selectivity at low levels of boost is clearly shown for the constant Q design.

  • Page 18: Appendix

    FCS-930/960 Appendix Chassis 0V Removal Transient Suppressor Replacement Appendix for conventional gyrator designs indicate inadequate selectivity at low 8.1 Chassis/0v levels of boost whilst displaying nearly twice as much combining ripple Removal at full boost. The adjacent band interaction effect is clearly much more pronounced, than is evident for the FCS-930/960, as each successive fader is adjusted.

  • Page 19: Optional Transformer Fitting

    Appendix Optional Balancing Transformer Fitting Optional Security Cover 8.3 Optional The two VDRs are mounted on a small circuit board attached to the rear of the 120/240v selector switch and are specified as Philips 2322- Balancing 594-61312 (Max voltage 130v). Please ensure the unit is disconnected Transformer Fitting from the mains power before attempting removal.

  • Page 20: Technical Specifications

    FCS-930/960 Technical Specifications Technical Specifications A steel security cover is available for the FCS-930/960 which is secured by two out of the four rack mounting screws. It is retrofittable and does not require any modification to the unit. Please refer to the factory for availability.
  • Page 21 Phantom Powering Accessory for AR-116. AR-130 System Polarity Checker. AR-125 Lead and Fuse Checker. AR-204 Transformer Line Balancing Unit. AR-416 4-Channel Active D.I. In keeping with our policy of continued improvement, BSS Audio reserve the right to alter specifications without prior notice.

  • Page 22: Warranty

    Warranty 10.0 Warranty Information This unit is warranted by BSS Audio to the original end user purchaser against defects in workmanship and the materials used in its manufac- ture for a period of one year from the date of shipment to the end user.

  • Page 23: User Notes

    User Notes...
  • Page 24 FCS-930/960 User Notes...
  • Page 25 User Notes...

  • Page 26: Front Panel Recall Sheet

    FCS-930/960...

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Fcs-930

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