BSS Audio FCS-960 Bedienungsanleitung
1
Welcome to the FCS-930/960 Users Manual
Welcome
V2.2 8 December 1995
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
FCS-930 FCS-960
User's Manual
DUALMODEGRAPHICEQUALISER
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,specificinformationisgiven.
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-960
FCS-930
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 SpecificationEN50082/1 1992 (RF Immunity, Fast
Transients and ESD)
Mains Disturbance EN61000/3/21995
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.
3
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 AC Voltage Setting 8
4.2 SafetyEarthing 8
4.3 AC Power Fusing 8
4.4 AudioConnections 9
4.5 GroundLoopControl 10
4.6 PoweringUp 10
5.0 Control Descriptions 11
5.1 Front Panel 11
5.2 RearPanel 12
6.0 Using the FCS-930/960 13
7.0 Filter Shapes and Interaction Effects 15
8.0 Appendix 18
8.1 Chassis/0v Link Removal 18
8.2 TransientSuppressorReplacement 18
8.3 OptionalTransformer Fitting 19
8.4 Optional Security Cover 19
9.0 Technical Specifications 20
10.0 Warranty 22
UserNotes 23
Front Panel Recall Sheet 26
4
FCS-930/960
1.0 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
stereopair.
The filter topology used is not based on the more common gyrator
principle,butrather on a bandpass multiplefeedback technique which
makes less demands on the integrated circuits at high frequencies. The
resultingexcellent sounding circuitalso offersgood longterm 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
providegentleprogramsweetening,orprecisesinglefrequencytuning,
suchasnotching room resonances and feedbacksuppression.
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
fadersettingsand excellent sonic transparency. Selectablenormal or
finefilterresponse.
• Continuouslyvariablehigh pass filter, with by-passswitch.
• Gaincontrol forsystemloudnessnormalisation.
• Peak clip LED to give advance warning of signal overload.
• Channel bypass selection and power fail bypass by relays.
• Electronicallybalancedinputsandoutputs.
• Proprietary design fader knob provides positive feel with ample finger
room, virtually eliminates visual parallax errors even under low
ambientlightconditions
• Optionalinternal inputandoutputtransformer balancing.
5
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
shouldthe 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.
2.0 Unpacking
6
FCS-930/960
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.
3.0 Mechanical Installation
Fig. 1 Mechanical
Dimensions
7
4.0 Connections
Unpacking
Warranty
Warning
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 MUSTBEEARTHED.
IMPORTANT: The wires in this mains lead are colour coded in
accordancewiththe following code:
Greenandyellow: Earth
Blue : Neutral
Brown : Live
As the colours of the wires in the mains lead of this appliance may not
correspondwith the colouredmarkings identifying theterminals in your
plug,proceedas 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
safetystandards.
Fig. 2 Mains Voltage
Switch and Fuse
8
FCS-930/960
AC Voltage Setting
SafetyEarthing
AC Power Fusing
4.1 Voltage Setting Themainsvoltageselectorswitchprovides 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.
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
groundingcircuit.TheFCS-930/960haselectronicallybalancedaudio
connections and does not need disconnection of any safety earth for the
avoidanceofhumloops.
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
suppressorscanbecomedamagedandwillconsistentlyblow
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
replacementprocedure.
4.2 Safety Earthing
4.3 AC Power
Fusing
9
Audio Connections
4.4 Audio
Connections
Fig. 3 Input and Output
ConnectorWiring
TheFCS-930/960 audio inputs areRFI filtered andelectronically
balanced,with the outputs electronicallybalanced and floating. Theyare
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’scomplexity.Figure3showstheconnectorwiring.
Note that pin 1 of the input XLR is not connected to ground.
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,andto side-step potential problems.
Ifthe 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
wiringconventionoftheunbalancedequipment.
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
connectionbetweenthe cable screenand0v/chassisgroundconnection
of the unbalanced equipment. Strict adherence to this will help to
eliminatepotential ground loophums by removing signal currents from
thecable screen.
BalancedWiring
UnbalancedWiring
10
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
theproblemsnormallyassociatedwithinterconnectedaudioequipment.
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
similarresults.
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
equipmentconnectedtotheunit’soutputs.
4.6 Powering Up
Dieses Handbuch passt für folgende Modelle
1
Inhaltsverzeichnis
Andere BSS Audio Stereo-Equalizer Handbücher
