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BSS Audio 

                        FCS-930/960 User Manual v3.0

Page 1

V 3.0

JMK

14

th

 October 1998

FCS-930/960

User Manual

This equipment has been tested and found to comply with the following European and

international Standards for Electromagnetic Compatibility and Electrical Safety:
Radiated Emissions (EU):

EN55013

(1990) Associated Equipment

RF Immunity (EU):

EN50082/1

(1992) RF Immunity, Fast Transients 

ESD

Mains Disturbance (EU):

EN61000/3/2

(1995)

Electrical Safety (EU):

EN60065

(1993)

Radiated Emissions (USA):

FCC part 15 Class B

Electrical Safety (USA):

UL813/ETL

(1996) Commercial Audio Equipment

Electrical Safety (CAN):

UL813/ETLc

(1996) Commercial Audio Equipment

IMPORTANT SAFETY INFORMATION
DO NOT REMOVE COVERS. NO USER SERVICEABLE PARTS INSIDE, REFER SERVICING

TO QUALIFIED SERVICE PERSONNEL. THIS EQUIPMENT MUST BE EARTHED.

IT SHOULD NOT BE NECESSARY TO REMOVE ANY PROTECTIVE EARTH OR SIGNAL

CABLE SHIELD CONNECTIONS TO PREVENT GROUND LOOPS. ANY SUCH

DISCONNECTIONS ARE OUTSIDE THE RECOMMENDED PRACTISE OF BSS AUDIO

AND WILL RENDER ANY EMC OR SAFETY CERTIFICATION VOID.

For continued compliance with international EMC legislation ensure that all input and

output cables are wired with the cable screen connected to Pin 1 of the XLR connectors.

The input XLR Pin 1 is connected to the chassis via a low value capacitor, providing high

immunity from ground loops whilst ensuring good EMC performance.

We have written this manual with the aim of helping installers and sound engineers to get
to grips with the 

FCS-930/960 

and obtain its maximum capability. If you are new to BSS

products, we recommend that you begin at the start of the manual.

We welcome any comments or questions regarding the 

FCS-930/960

 or other BSS

products, and you may contact us at the address or World Wide Web site given in
the warranty section.

Содержание FCS-930

Страница 1: ...IT SHOULD NOT BE NECESSARY TO REMOVE ANY PROTECTIVE EARTH OR SIGNAL CABLE SHIELD CONNECTIONS TO PREVENT GROUND LOOPS ANY SUCH DISCONNECTIONS ARE OUTSIDE THE RECOMMENDED PRACTISE OF BSS AUDIO AND WILL RENDER ANY EMC OR SAFETY CERTIFICATION VOID For continued compliance with international EMC legislation ensure that all input and output cables are wired with the cable screen connected to Pin 1 of th...

Страница 2: ...ons 6 6 1 Front panel 7 6 2 Rear panel 7 7 Using the FCS 930 960 8 7 1 Normal Mode 9 7 2 Fine mode 9 7 3 High pass filter 9 7 4 Gain control peak LED 9 8 Filter shape and interactive effects 10 9 Service section 11 9 1 Chassis 0V removal 11 9 2 Transient suppressor replacement 12 9 3 Optional balancing transformer fitting 12 10 Warranty Information 13 11 Specifications 14 11 1 System Performance 1...

Страница 3: ... framework must also be connected to the same grounding circuit The unit must NOT be operated unless the power cables EARTH ground wire is properly terminated this is important for personal safety as well as for proper control over the system grounding The FCS 930 960 has electronically balanced audio connections and does not need disconnection of any safety earth for the avoidance of hum loops Th...

Страница 4: ...h 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 ...

Страница 5: ...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 c...

Страница 6: ...e two grounds at a convenient point or to add a suitable impedance network as part of a house system requirement Please refer to section 9 1 Chassis 0v Removal for information on this procedure Under no circumstances should the safety ground wire be removed from the mains AC power connector as an interim measure to achieve similar results 5 4 Powering up When the FCS 930 960 is switched on by oper...

Страница 7: ...vel entering the FCS 930 960 will need to be reduced in level If you are using large amounts of extra gain from the GAIN control then this can be backed off but any previous balance achieved will then be lost 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 gener...

Страница 8: ...ully 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 ...

Страница 9: ...ns for sweetening work as the combining response is still acceptably ripple free 7 3 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 li...

Страница 10: ...ined 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 desi...

Страница 11: ...ld 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 The...

Страница 12: ...e 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 Ensure that the mains power is disconnected from the unit before the lid is removed and the suppressors are removed 9 3 Optional balancing transformer fitting Provision is made internally to fit balancing transformers to both the electronically balanc...

Страница 13: ...when the repair has been completed If the unit was purchased in the European Union you may as an alternative return the unit to any other BSS distributor in the European Union 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 Deale...

Страница 14: ...ers flat 0 005 22Hz to 22kHz Output noise faders flat 90dBu 22Hz to 22kHz unweighted Channel separation 80dB from 22Hz to 22kHz Gain control range 10dB Peak indicator 18dBu Bypass Passive fail safe bypass relay 11 2 Filters Type MFB Constant Q Frequencies per channel 30 off on 1 3 octave ISO centres 25Hz to 20kHz Boost cut range Nominal 10dB Note 1 Mode Selectable normal or fine response High pass...

Страница 15: ...25 x8 9 4 3kg net 9 5 lbs 11 5 Options Transformer balancing Input and output Security cover Metal cover secured by rack screws 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 contact us for availability ...

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