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BSS Audio FCS966 User Manual

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Summary of Contents for BSS Audio FCS966

  • Page 1 FCS 966 User Manual...

  • Page 2: Important Safety Information

    FCS 966. We welcome any comments or questions regarding the FCS 966 or other BSS products, and you may contact us at the address or World Wide Web site given in the warranty section.

  • Page 3: Table Of Contents

    Contents Contents Mechanical installation Unpacking Mains Power Connection Mains Power Introduction Audio Connections XLR Inputs XLR Outputs Jack Inputs Jack Outputs Combi-Con connectors Control operations Eq In Gain HP Filter LF Contour HF Contour Output meter Clip indicators Frequency band sliders General guide to equalisers What is a graphic? How do I use it?
  • Page 4 Contents Application examples General Equalisation - problem solving Feedback reduction Room equalisation Uses for the HP Filter Uses for the LF contour Use for the HF contour Warranty Information 10.0 Specifications Index User Notes Spare Parts Information...

  • Page 5: Mechanical Installation

    Mechanical Installation Mechanical installation A vertical rack space of 3U (5 1/4" - 133.5mm high) is required, with a depth of 190mm, excluding connectors. Ventilation gaps are unnecessary. If the unit is likely to undergo extreme vibration through extensive road trucking and touring, the unit must be supported at the rear and/or sides to lessen the stress on the front mounting flange.

  • Page 6: Unpacking

    Mains Power Connection Unpacking As part of the BSS system of quality control, we check every product carefully before packing to ensure that it reaches you in flawless condition. Before you go any further, please check the unit for any physical damage and retain the shipping carton and all relevant packing materials for use, should the unit need returning.

  • Page 7: Introduction

    Introduction with the appropriately rated fuse (as specified previously) for continued protection against damage and fire. Note: For USA and Canadian users, the replacement fuse must be of an identical UL rated type fuse for continued compliance with safety standards. Introduction The FCS 966 is a two channel graphic equaliser that provides a generous -15dB of control range on each of 30 constant Q frequency bands.
  • Page 8 The FCS 966 Fig 4.1 Front Panel Fig 4.2 Rear Panel...
  • Page 9 All numbers in bubbles refer to Section numbers.

  • Page 10: Audio Connections

    Audio Connections Audio Connections 5.1 XLR Inputs There are 2 input sockets on the rear panel of the FCS 966; Input 1 and 2. Each is electronically balanced on standard 3 pin female XLRs at an impedance greater than 10k Ohms. The ‘HOT, +, or in phase’ connection is to pin 2 and the ‘COLD, -, or out of phase’...

  • Page 11: Jack Inputs

    When using the FCS 966 to drive unbalanced inputs, best performance is usually obtained by connecting the FCS 966s ‘+’ signal to the equipment signal pin and the ‘-’ signal to the equipment shield. Fig 5.4 The FCS 966 shield should normally be connected to the equipment shield, preferably at the equipment end.

  • Page 12: Jack Outputs

    Audio Connections Control operations Control operations Control operations Control operations Control operations 5.4 Jack Outputs The Jack outputs are electrically identical to the XLR outputs. The signal ‘HOT, +, or in phase’ signal is connected to the jack plug tip. The ‘COLD, -, or out of phase’...
  • Page 13 When feeding the FCS 966 from unbalanced sources, connect as follows. Note the link between the two end pins. Fig 5.11 When feeding the FCS 966 to unbalanced sources, connect as follows. Note the link between the two end pins. Fig 5.12...

  • Page 14: Control Operations

    Control operations Control operations 6.1 Eq In When the eq in switch is in the out, non illuminated position, all FCS 966 functions are bypassed and the input is connected directly to the output with a high quality relay. This condition also occurs when the power is off, and ensures that the signal is passed through the unit in the case of a power or fuse failure.

  • Page 15: Hp Filter

    6.3 HP Filter Rotating this control clockwise progressively removes low frequency program material, which is useful for controlling sub-sonic signals that otherwise could cause overload problems. Judicious use of this control may allow more boost to be applied with the main graphic section, as unwanted lower frequencies are removed before the main signal is boosted.

  • Page 16: Hf Contour

    Control operations 6.5 HF Contour This control serves a similar purpose as the LF contour, but applied to higher treble frequencies. The HF contour control allows a subtle change to be made to the shape of the sound without affecting the previously configured main equaliser.

  • Page 17: Clip Indicators

    6.7 Clip indicators There are three critical places in the signal path of the FCS 966 that are monitored by the clip indicator circuit; if one or more of these overloads, the indicator is illuminated. These three places are: the output of the contour section, the output of the main equaliser section, and the output from the gain control section.

  • Page 18: General Guide To Equalisers

    General guide to equalising General guide to equalisers 7.1 What is a The graphic equaliser is one of the most common pieces of signal processing equipment. It finds uses both in recording environments and live performance, graphic? as well as sound reinforcement and noise pollution control. The graphic equaliser is a very powerful tool, and as with all powerful devices caution should be exercised or problems will occur.

  • Page 19: What Does Constant Q Mean

    Figure 7.1 shows very approximately the sliders that have most effect on some common instruments - having an effect is related to the harmonic richness of the sound. A flute for example, generating relatively pure tones, will only have energy in a small number of bands at a given time, whereas a guitar has harmonics covering most bands.
  • Page 20 Fig 7.4 constant Q response In line with it’s other graphic equalisers, BSS have chosen a ‘constant Q’ topology for the FCS 966, as this gives the best correlation between the actual slider positions and the measured response of the unit. Figure 7.4 shows how the response of the FCS 966 follows much more closely the curve depicted by the sliders than a gyrator based graphic (figure 7.3).

  • Page 21: Application Examples

    Application examples Application examples Each of the following application examples is accompanied by a front panel control diagram. Controls that are not greyed out should be set to the value shown - refer to the text where no initial setting is shown. Those controls which are greyed out can be set to any value, and are not critical to the example.

  • Page 22: Feedback Reduction

    Application examples 8.2 Feedback This is one of the major uses for graphic equalisers reduction in sound reinforcement applications. The FCS 966 would usually be connected either to the mixer ‘mix insert’ points, or between the output of the mixer and the input of the amplifier or crossover.

  • Page 23: Uses For The Hp Filter

    Be aware that making the system ‘flat’ by applying large amounts of boost is not desirable; when real program is applied to a system setup this way, overload is almost certain to occur. It is far better to reduce the level of peaks than try to fill in large holes.

  • Page 24: Uses For The Lf Contour

    Application examples 8.5 Uses for the LF contour As the contour controls are gentle in operation, they are intended to be used whenever it is desired to change the tonal balance of the sound without disturbing the main equaliser settings. The LF contour control has many uses, but one particular application concerns small PA systems and presentations that contain both pre-recorded material and live presentations.

  • Page 25: Warranty Information

    Warranty Information Warranty Information When sold to an end user by BSS Audio or a BSS Audio Authorised Reseller, this unit is warranted by the seller to the purchaser against defects in workmanship and the materials used in its manufacture for a period of one year from the date of sale.

  • Page 26: Specifications

    Specifications 10.0 Specifications General Input Impedance 10kOhm balanced or unbalanced Input Headroom >+20dBu Max Output level >+21dBu into 600 ohms or greater Output Impedance <50 Ohms unbalanced or unbalanced Frequency Response <5Hz to >45kHz +/-1dB Noise <-94dBu 22Hz to 22kHz Dynamic Range >...

  • Page 27: Index

    Index Index Clip indicator Inputs Connection Combi-Con mains power Jack Connections Combi-Con Installation Jack mechanical Introduction Constant Q Contour LF Contour uses for... Dimensions Mains power Output meter general Outputs Combi-Con Jack faces front rear Rack space Sliders Rear panel constant Q Room equalisation effect on..

  • Page 28: User Notes

    User Notes...
  • Page 30 User Notes...

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