BSS Audio | FCS-960 | User`s manual | BSS Audio FCS-960 User`s manual

V2.2 8 December 1995
Welcome
Welcome to the FCS-930/960 Users Manual
FCS-930 DUAL MODE GRAPHIC EQUALISER
FCS-960 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 FCS930/960 series within your application, please write to us at the address
in the warranty section.
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 authorisation, is in violation of the European Copyright Convention. BSS Audio 1995
1
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. The input XLR pin
1 on BSS equipment is generally connected to chassis via a capacitor to
prevent ground loops whilst ensuring good emc compatibility.
2
Table Of Contents
Table Of Contents
1.0
Introduction
4
2.0
Unpacking
5
3.0
Mechanical Installation
6
4.0
Connections
7
4.1
4.2
4.3
4.4
4.5
4.6
5.0
AC Voltage Setting
Safety Earthing
AC Power Fusing
Audio Connections
Ground Loop Control
Powering Up
Control Descriptions
5.1
5.2
Front Panel
Rear Panel
8
8
8
9
10
10
11
11
12
6.0
Using the FCS-930/960
13
7.0
Filter Shapes and Interaction Effects
15
8.0
Appendix
18
8.1
8.2
8.3
8.4
9.0
10.0
Chassis/0v Link Removal
Transient Suppressor Replacement
Optional Transformer Fitting
Optional Security Cover
18
18
19
19
Technical Specifications
20
Warranty
22
User Notes
Front Panel Recall Sheet
23
26
3
FCS-930/960
Introduction
1.0
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, butrather 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 by-pass 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.
4
Unpacking
2.0
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.
With the FCS-930/960 will be a small packet of spare fuses. Please keep
them in a safe place.
If any damage has occurred, please notify your dealer immediately, so
that a written claim for damages can be initiated. See the Warranty
section of this manual.
5
FCS-930/960
Mechanical Installation
3.0
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. Failure to do so will impair reliability and
invalidate the Warranty. Figure 1 details the relevant dimensions and
fixing centres. Adequate ventilation must be provided for by allowing
sufficient room around the sides and rear of the unit to ensure free
circulation of air. Forced cooling is not required. The front of the unit
should not be exposed to long term direct sunlight as this can have a
detrimental long term effect on the control knobs.
The internal power supply transformer is mounted on the case rear. After
a period of time in an enclosure, the metal case will feel hot to the
touch, but this is quite normal and should not be a cause for alarm.
Fig. 1 Mechanical
Dimensions
6
Unpacking
Warranty
Warning
4.0
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
Blue
:
Neutral
Brown
:
Live
As the colours of the wires in the mains lead of this appliance may not
correspond with the coloured markings identifying the terminals in your
plug, proceed as follows:
The wire which is coloured green and yellow must be connected to the
terminal in the plug which is marked with the letter 'E' or by the earth
symbol , or coloured green and yellow.
The wire which is coloured blue must be connected to the terminal
which is marked with the letter 'N' or coloured black.
The wire which is coloured brown must be connected to the terminal
which is marked with the letter 'L' or coloured red.
Those units that are supplied to the North American market will have an
integral moulded 3 pin connector which is provided to satisfy the area
safety standards.
Fig. 2 Mains Voltage
Switch and Fuse
7
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. If you subject the unit to voltages
in excess of this you are likely to cause damage. If the mains voltage is
below those specified, there will be reduced performance before the unit
finally fails to work.
4.2 Safety Earthing
The green/yellow wire of mains cord must always be connected to the
electrical installations Safety Earth or Ground. It is essential for personal
safety, as well as proper operation of the unit, and is internally
connected to all exposed metal surfaces. Any rack framework that this
unit might be mounted into is assumed to be connected to the same
grounding circuit. The FCS-930/960 has electronically balanced audio
connections and does not need disconnection of any safety earth for the
avoidance of hum loops.
4.3 AC Power
Fusing
The incoming mains power is fused within the FCS-930/960 by the fuse
holder mounted on the rear panel. If it needs to be replaced it must be
properly rated as: 20mm T200mA for 240v mains operation, and
T250mA for 120v mains operation. It is most important for continued
safety that this specification is adhered to, and you will have found that a
spare fuse of this rating is supplied together with your unit and manual.
It is very unlikely that this fuse will fail during normal use, and must be
treated with some caution as to the cause, if it should do so. One of the
most likely reasons will be following the incorrect setting of mains
voltage switch on the rear panel. Another reason can be the inadvertent
connection of line to line rather than line to neutral phase voltages when
using a three phase power connection. In either case internal transient
suppressors can become damaged and will consistently blow
replacement fuses. You can be assured that they have protected your
unit from damage, but they will need removal to allow further use of
your unit, and should be replaced as soon as possible to ensure
continued protection. If you feel this has happened please refer to the
appropriate section at the rear of this manual for the removal and
replacement procedure.
8
Audio Connections
4.4 Audio
Connections
The FCS-930/960 audio inputs are RFI filtered and electronically
balanced, with the outputs electronically balanced and floating. They are
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. Figure 3 shows the connector wiring.
Note that pin 1 of the input XLR is not connected to ground.
Balanced Wiring Whether your system is wired to a ‘pin 3 hot’ or a ‘pin 2 hot’ convention
will not matter as long as your wiring to both the input and output 3 pin
XLR connectors are the same . As is common with all other BSS
equipment of this type, we follow the convention of ‘screen goes forward
with the signal’. Input cable screening therefore needs to be derived from
the signal source end as pin 1 is ground lifted for the inputs. You should
use high quality audio cable with 2 cores + screen for low noise and
reliability, and to side-step potential problems.
Unbalanced Wiring If the equipment driving the FCS-930/960 has only unbalanced outputs
then you will need to add a wire jumper such that the screen connection
on Pin 1 of the XLR is shorted to either Pin 2 OR Pin 3, depending on the
wiring convention of the unbalanced equipment.
If the equipment being connected to the FCS-930/960 outputs has only
unbalanced inputs, then we recommend that you still use a balanced
(i.e. 2 core shielded) cable. The interconnecting cable should have it’s
screen grounded by pin 1 of the FCS-930/960 output, the pin 3 output
should be connected to the unbalanced input 0v ground, and the pin 2
output should be connected to the live input. There should be no
connection between the cable screen and 0v/chassis ground connection
of the unbalanced equipment. Strict adherence to this will help to
eliminate potential ground loop hums by removing signal currents from
the cable screen.
Fig. 3 Input and Output
Connector Wiring
9
FCS-930/960
Ground Loop Control
Powering Up
4.5 Ground Loop
Control
Strict adherence to the wiring conventions noted above within a fully
balanced signal system will yield the best possible results with none of
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.
Where it is not possible to control all of the external cabling, it might
become necessary to have the internal electronic ground of your unit
separated from the case safety ground. Provision is made internally
within the FCS-930/960 to separate these two grounds at a convenient
point, or to add a suitable impedance network as part of a house system
requirement.
Please refer to a later section for information on this procedure.6.
Under no circumstances should the safety ground wire be removed
from the mains AC power connector as an interim measure to achieve
similar results.
4.6 Powering Up
10
When the FCS-930/960 is switched on by operating the power on-off
switch located on the rear panel, the front panel LED showing the
normal MODE will be illuminated. This indicates to you that the internal
power supply circuitry is functioning correctly. The unit will also be in
it’s bypass mode. Should you subsequently have the EQ IN switch
selected before power up, there will be a slight delay before the bypass
relays operate to allow time for the internal circuitry to settle down. This
ensures a silent power up without danger of causing damage to other
equipment connected to the unit’s outputs.
Control Descriptions
Front Panel
5.0
Control Descriptions
5.1 Front Panel
1
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’ setting in the central position.
1
2
Gain adjustment control with +/- 10dB of range. Adjust this if you wish to balance the
equalised sound with the general loudness of the unequalised sound. The control has no
effect on the bypassed signal level.
3
EQ IN selector. Push to select equalisation, release to bypass. The LED indicator
illuminates to confirm the equalisation in status. Bypass is achieved by using relays
which ensures a complete equipment bypass.
4
Peak LED indicator gives you advance warning of possible circuit overload by
illuminating 2dB before actual clip. It is monitoring signals both before and after the
GAIN control [2] and will operate should any one of them exceed the danger level.
Should this occur, then the signal level entering the FCS-930/960 will need to be
reduced in level. If you are using large amounts of extra gain fromthe GAIN control then
this can be backed off, but any previous balance achieved will then be lost.
5
Operate this MODE switch to change the filter bandwidth. This is confirmed by the
appropriate LED illuminating, with higher selectivity, fine mode being active with the
switch depressed. In general you should use the normal mode (switch out), for all
general sweetening work. Select the fine mode for specialised room/speaker notching
and feedback control applications.
6
Frequency control for the high pass filter. This allows you to roll off the low frequency
energy of the program should it not be required. It is fully adjustable from 20Hz to
250Hz.
7
High pass filter switch selects whether the filter is in or out of circuit. Pressing the switch
selects the filter, confirmed by the LED illuminating.
11
FCS-930/960
Rear Panel
5.2 Rear Panel
8
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.
9
Mains power switch.
10
Mains voltage selector switch allows operation from 90V-130V or 190V-250V.
11
Electronically balanced and floating output. Maximum output is +20dBu into 600Ω.
Transformer balancing is available as an option.
The pin connections are:
Pin 1
Pin 2
Pin 3
12
Ground/chassis.
Hot (+).
Cold (-).
Electronically balanced input. Maximum input is +20dBu into 10kΩ. Transformer
balancing is available as an option.
The pin connections are:
Pin 1
Pin 2
Pin 3
Open circuit/no connection.
Hot (+).
Cold (-).
Please take special 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 it’s screen grounded at the signal source end.
When using a fully balanced system, either Pin 2 or Pin 3 may be the HOT terminal.
12
Using the FCS-930/960
6.0
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.
Normal Mode Here the Q value of the filter is set to allow groups of faders to be set in a
Mode Switch Out pattern which represents fairly closely the actual amplitude response
obtained. The combining effect is smooth whilst still retaining a degree
of selectivity normally associated with a graphic equaliser. The constant
Q design allows predictable and precise control over the whole range of
fader movement.
This Normal mode would be used for all sweetening type of work where
boosts and cuts are combined to provide an overall smooth contouring
response.
Fine Mode Here the filters are reconfigured to offer a higher Q value, and hence
Mode Switch In produce less adjacent filter interaction. This requirement is consistent
with applications where high selectivity is required such as for correcting
room resonances and where a number of notches are required to be
inserted to avoid feedback. Again the filters produce a constant Q shape
which allows high selectivity for small amounts of cut or boost. A feature
hard to realise on many other graphic equalisers.
13
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.
High Pass Filter This third order variable filter sweeps from 20Hz to 250Hz at 18dB/oct
and provides extra equalisation in applications where precise control is
required on
the low frequency energy within a system. This can be required for
protecting loudspeakers from excessive cone excursion beyond their
design limits, for optimising amplifier headroom in passively crossedover loudspeaker systems by limiting wasted power at low frequencies,
or for increasing intelligibility in mainly voice based applications. Press
the associated switch to select the
filter, and the LED illuminates in confirmation. De selecting the function
removes the filter from the signal path completely.
Gain Control This control is incorporated within the filter sections offering the facility
Peak LED to balance the overall sound level, after setting the required equalisation.
It offers a range of ±10dB, the centre position being 0dB unity gain.
When the EQ IN switch is released (equalisation bypassed), the GAIN
control is also bypassed and does not affect the output signal level. This
allows proper A/B comparisons to be made of the program signal as the
EQ IN switch is operated.
The PEAK LED indicator monitors a number of points within the circuitry
and will indicate when the signal at any of the monitored points reaches
within 2dB of clip. This is only likely to occur if the input signal to the
unit is quite large and substantial boost equalisation is being used. In
either case the input signal to the FCS-930/960 needs to be reduced
accordingly. Should you be using large amounts of GAIN then this could
also cause the PEAK LED to indicate and suitable correction can be
applied by backing-off the GAIN control accordingly.
14
Filter Shape and Interaction Effects
7.0
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. Their advantages lie with the
visual picture obtained by the fader positions in representing the
modifications made to the frequency response, and with the reciprocal nature of the boost and cut effect. Their disadvantages lie in having only certain fixed frequencies available, and with the interaction
effect of one fader on its adjacent fader. The pictorial view of a modified amplitude response as shown by the fader positions is an ‘idealised’ one. Each filter has a predetermined shape, defined by its Q
value and design topology and the actual result obtained will not
necessarily be a smooth curve, as depicted by the fader knob positions, but rather one which is defined by the overall shape of each
filter and how it combines with its adjacent filter. For the application
of general sweetening where groups of faders will be moved to form a
particular shape, a good combining effect is desired to avoid a
number of humps appearing in the amplitude response. This requires a
particular filter design which is not compatible with that needed when
greater selectivity is required for room tuning and feedback suppression. Moreover, on some graphic equaliser designs, the Q value will
vary as the amount of boost or cut is varied, further adding to the
complication.
On the FCS-930/960 we have carefully optimised the design to account for these effects. Adding the dual mode feature allows us to re
configure the filter shapes to accommodate the different applications.
Using a constant Q filter design removes the width variation with
boost and cut, thus allowing more selectivity at low levels of boost
and cut.
The basic amplitude shape of each filter is shown in Fig 6. The frequency is that at the centre of the response, the Q value is a measureFig. 6 Frequency
Response of Filter
Frequency is fc.
Q value is a measure of the
width of the peak, 3dB
down from the peak
amplitude value.
15
FCS-930/960
Filter Shape and Interaction Effects
ment of it’s sharpness or selectivity, and the boost/cut shape is symmetrical 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
16
FCS-930/960 FINE MODE
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.
When adjacent filters are adjusted there will always be some interaction
affect, and the degree that is required is dependent on the application.
Fig 8 shows a series of curves indicating the interaction effect when two
adjacent filters are selected.
Curve A is one filter selected for 6dB of boost. Curve B shows the
combined effect when an adjacent filter is also selected for 3dB of boost.
The precise selectivity achieved by the FCS-930/960 in its fine mode can
be clearly seen, the normal mode also exhibiting improved selectivity
over contemporary designs. The gyrator design shows a very low degree
of selectivity together with a much larger change in maximum boost at
the original centre frequency, as the adjacent filter is added.
Fig 9. shows another series of curves demonstrating the effects of having
1,2,3 and 4 faders successively adjusted, for both half and full boost
fader settings.
The FCS-930/960 in it’s Normal mode shows very smooth combining
properties with almost complete absence of ripple, even at full boost. For
the Fine mode precise selectivity and minimal interaction is achieved at
half boost, whilst for full boost combining ripple is minimal. The curves
Fig 9. Combining of
1,2,3,and 4 Consecutive
Faders
Half and Full Boost
Combining Effects
GENERAL GYRATOR DESIGN
FCS-930/960 NORMAL MODE
FCS-930/960 FINE MODE
17
FCS-930/960
Appendix
Chassis 0V Removal
Transient Suppressor Replacement
8.0
Appendix
8.1 Chassis/0v
Removal
for conventional gyrator designs indicate inadequate selectivity at low
levels of boost whilst displaying nearly twice as much combining ripple
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.
The FCS-930/960 has the signal 0v ground connected to the metal
chassis, which in turn is connected to the safety ground. In the unlikely
event that you need to remove this link, or if you need to add a small
impedance to reduce earth loop currents, then proceed as follows.
Since both the audio inputs and outputs are wired fully balanced we
would suggest that you fully recheck all audio wiring for correctness,
prior to proceeding.
Under no circumstances should the incoming safety ground wire be
disconnected from the power line cord, or from the internal chassis
connection as an alternative to this procedure.
1 Disconnect the mains power cord and remove the unit’s top cover.
2 Locate the link on the printed circuit board adjacent to the rear PCB
fixing bracket marked ‘GROUND LIFT’.
3 Remove this link.
The signal/0v ground is now isolated from the chassis.
8.2 Transient
Suppressor
Replacement
The other link, marked ‘PIN 1 TO CHASSIS’ is connecting the output
XLR pin 1 connections to chassis. Under no circumstances is it
recommended that you remove this link.
The primary of the mains input transformer is protected from high
voltage spike interference by two voltage dependent resistors (VDR).
These provide a momentary short circuit to voltage peaks in excess of
the normal voltage rating.
Should your unit be inadvertently connected to three phase line/line
voltages, or to 240v when selected for 120v, or any other incorrect
voltage, these suppressors are likely to fail in a short circuit mode. This
will be demonstrated by repeated mains fuse failure at switch on.
Even in this case of extreme over voltage the unit is protected against
failure, and the simple removal of these suppressors will allow the unit to
be used again. However it is important that they are replaced as soon as
possible to ensure continued protection.
18
Appendix
Optional Balancing Transformer Fitting
Optional Security Cover
8.3 Optional
Balancing
Transformer Fitting
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 2322594-61312 (Max voltage 130v). Please ensure the unit is disconnected
from the mains power before attempting removal.
Provision is made internally to fit balancing transformers to both the
electronically balanced inputs and outputs.
INPUT TRANSFORMER KIT IS BSS PART No:
Z-TIX1KIT-01 for the FCS-930
Z-TIX2KIT-01 for the FCS-960
OUTPUT TRANSFORMER KIT IS BSS PART No:
Z-TOX1-KIT-01 for the FCS-930
Z-TOX2-KIT-01 for the FCS-960
The transformers are easily fitted onto the printed circuit board adjacent
to the respective output connectors. Please ensure correct orientation
and removal of links:
8.4 Optional
Security Cover
LINK REMOVAL
CHN 1
CHN 2 (FCS-960 only)
INPUT TX
OUTPUT TX
1, 2
3, 4
7, 8
5, 6
19
FCS-930/960
Technical Specifications
9.0
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.
Input Section
10kΩ electronically balanced, +20dBu
maximum input level via XLR3-31 or
equivalent.
Output Section
Electronically balanced and floating,
capable of driving +20dBu into 600Ω or
greater via XLR3-32 or equivalent.
System Performance
Frequency response
THD at +4dBu (faders flat)
Output noise (faders flat)
Channel separation
Gain control range
Peak indicator
Bypass
Filters
Type
Frequencies, per channel:
Boost/cut range
Mode
High pass filter
Power
Voltage
±0.25dB from 20Hz to 20kHz
<0.005% 22Hz to 22kHz
<-90dBu, 22Hz to 22kHz unweighted
>80dB from 22Hz to 22kHz
±10dB
+18dBu
Passive fail-safe bypass relay
MFB Constant Q
30 off on 1/3 octave ISO centres
25Hz to 20kHz
Nominal ±10dB. Note 1
Selectable normal or fine response
18dB/Oct Butterworth sweepable 20Hz
to 250Hz
30VA 50-60Hz, 90-120Vac or 190-250Vac
selectable externally.
2m power cord connected via IEC socket.
Dimensions/Weight
FCS-930:
482x89x227mm.
(19"x3.5"x8.9")
4kg net, (8.8lbs).
FCS-960: 482x132x227mm.
(19"x5.25"x8.9")
4.3kg net, (9.5 lbs).
Options
Transformer balancing
Security cover
20
Input and output.
Metal cover, secured by rack screws.
Technical Specifications
Note 1. Although the nominal boost and cut range is specified as
±10dB, the actual figure reached is dependent on the number of
adjacent faders selected, as is the case for all equipment of this type.
Reference to the amplitude/frequency plots shown within this manual
will clarify the position.
Should you experience any difficulty in operating this equipment please contact your local dealer who will also be able to
supply you with information on the full range of equipment
manufactured by BSS Audio .
DPR-402
2 Channel Compressor, De-esser, and Peak Limiter
DPR-404
4 Channel Compressor and De-Esser
DPR-502
2 Channel Noise Gate with Midi Interface
DPR-504
4 Channel Noise Gate
DPR-901
Dynamic Equaliser
EPC-760
High Power Audio Amplifier
EPC-780
High Power Audio Amplifier
FCS-926
Varicurve Dual Equaliser/Analyser
FCS-920
Varicurve Dual Equaliser/Analyser
FPC-900
Varicurve Remote Control System
FCS-930
1 Channel 30 Band Graphic Equaliser
FCS-960
2 Channel 30 Band Graphic Equaliser
FDS-310
2/3/4 Way Variable Electronic Crossover
FDS-318
Stereo Multimode Electronic Crossover
FDS-360
Programmable Electronic Crossover with Limiters
and Phase Correction.
MSR-604 II 4 Channel Active Microphone Signal Distribution
and Splitting System.
AR-116
Active Direct Injection (DI) Box.
AR-117
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.
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FCS-930/960
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 manufacture for a period of one year from the date of shipment to the end user.
Faults arising from misuse, unauthorised modifications or accidents
are not covered under this warranty. No other warranty is expressed
or implied.
If the unit is faulty it should be sent, in its original packaging, to the
supplier or your local authorised BSS Audio dealer with shipping
prepaid.
You should include a statement listing the faults found. The unit’s serial
number must be quoted in all correspondence relating to a claim.
We recommend that you record your purchase information here for
future reference.
IMPORTANT
Dealer Name:
Dealer Address:
Post/Zip Code:
Dealer Phone No.:
Dealer Contact Name:
Invoice/Receipt No.:
Date of Purchase:
Unit Serial Number:
In keeping with our policy of continued improvement, BSS Audio
reserves the right to alter specifications without prior notice.
The FCS-930/960 series was designed, developed and produced by
BSS Audio, Hertfordshire, England.
Please note our new phone numbers.
Phone (+44) (0)1707 660667. Fax (+44) (0)1707 660667.
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User Notes
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FCS-930/960
User Notes
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User Notes
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FCS-930/960
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