AEQ BC-300 User manual

A.E.Q., S.A. manufacturer of this equipment is a Registered Company
with UNE EN - ISO-9001 by AENOR ER-080/1/96 standard. / A.E.Q., S.A. fabricante de este
equipo, es “Empresa Registrada”de acuerdo con la norma UNE EN-ISO-9001 por AENOR con
el nº:ER-080/1/96
AEQ BC-300
Broadcast Mixing Console
Mezclador de Audio para Radiodifusión
USER’S MANUAL / MANUAL DE USUARIO
ED. 11/01

A.E.Q., S.A. manufacturer of this equipment is a Registered Company
with UNE EN - ISO - 9001 by AENOR ER-080/1/96 standard
AEQ BC-300
Broadcast Mixing Console
USER’S MANUAL
ED. 11/01

AEQ BC-300
Broadcast Mixing Console
3
1. GENERAL
1.1. GENERAL PRECAUTIONS
1.1.1. READ ALL THE INSTRUCTIONS
1.1.2. POWER SUPPLY AND EARTH CONNECTIONS
1.1.3. PROTECTION AGAINST VOLTAGE VARIATION
1.1.4. WATER AND HUMIDITY
1.1.5. VENTILATION
1.1.6. MAINTENANCE
1.1.7. WARRANTY
2. EQUIPMENT POWER SUPPLY
2.1. GENERAL
2.1.1. BEFORE CONNECTING THE EQUIPMENT TO ELECTRICAL MAINS.
2.1.2 VOLTAGE SELECTION
2.1.3. SWITCHING ON THE EQUIPMENT
3. AUDIO CONNECTIONS
3.1. GENERAL
AES 14-1.992 (ANSIS 4.48 - l.992)/IEC 268 - 12 of 1.987.
4. DESCRIPTION OF THE MIXER
4.1. BASIC DESIGN CONCEPTS
4.2. STANDARD CONFIGURATIONS
5. MODULE DESCRIPTIONS
5.1. BC-311 2 MONO MIC./LINE INPUT CHANNEL MODULE
5.1.1. FUNCTIONAL DESCRIPTION
5.1.2. DESCRIPTION OF CONTROLS AND CONNECTIONS
5.2. BC-322 4 STEREO DOUBLE LINE INPUT CHANNEL MODULE
5.2.1. FUNCTIONAL DESCRIPTION
5.2.2. DESCRIPTION OF CONTROLS AND CONNECTIONS
5.3. BC-378 OUTPUT, TELEPHONE HYBRID AND MONITOR CONTROL MODULE
5.3.1. FUNCTIONAL DESCRIPTION
5.3.2. DESCRIPTION OF CONTROLS AND CONNECTIONS
5.4. CHASSIS 5.4.1. FUNCTIONAL DESCRIPTION
5.4.2. DESCRIPTION OF CONTROLS AND CONNECTIONS

AEQ BC-300
Broadcast Mixing Console
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6. INTERNAL PROGRAMMING AND SCHEMATIC PLAN OF SIGNAL
CONNECTIONS AND EXTERNAL HYBRID
6.1. PROGRAMMING AND INTERNAL ADJUSTMENTS
6.2. DIAGRAM OF SIGNAL CONNECTIONS
6.3. DIAGRAM OF EXTERNAL HYBRID CONNECTIONS
7. TECHNICAL SPECIFICATIONS
BLOCK DIAGRAM
7 .1. INPUTS 7.1.1. BC-311 MIC./LINE INPUTS
7.1.2. BC-322 STEREO LINE INPUTS
7.1.3. BC-378 AUXILIARY INPUTS
7.1.4. BC-378 EXTERNAL INPUTS
7.1.5. BC-378 TEL./4W INPUTS/OUTPUTS
7.2. OUTPUTS 7.2.1. BC-378 MASTER OUTPUTS
7.2.2. BC-378 AUXILIARY OUTPUTS
7.2.3. BC-378 RECORDING OUTPUTS
7.2.4. BC-378 MONITOR CONTROL OUTPUTS
7.2.5. BC-378 MONITOR STUDIO OUTPUTS
7.2.6. BC-378 HEADPHONE OUTPUT
7.3. SIGNALLING
7.4. POWER SUPPLY
7.4.1. ELECTRICAL POWER SUPPLY
7.5. DIMENSIONS AND WEIGHT
7.5.1. DIMENSIONS
7.5.2. WEIGHT

AEQ BC-300
Broadcast Mixing Console
5
1. GENERAL
1.1. General precautions
The following security and precautionary measures must be observed during all phases
of operation and maintenance of the unit. Failure to comply with the instructions highlighted in
this manual could affect the performance and function of the equipment. AEQ accept no
responsibility for damage or injury caused by incorrect use or manupulation of the
equipment.
1.1.1. Read all the instructions
To obtain the optimum performance and reliability from the moment of installation, and
to prevent injury, incorrect operation or damage to the equipment, it is absolutely indispensable
to thoroughly read all the instructions contained in this manual before connecting and operating
the equipment.
1.1.2. Power supply and earth connections
To reduce the risk of electrical shock, this unit must be connected to earth. The
equipment is supplied with an earth connection socket. If it is necessary to change the
connection it should be noted that the cable to earth is marked yellow/green.
1.1.3. Protection from excessive supply voltage variation
In areas which are subject to frequent variations in the supply voltage it will be
necessary to incorporate additional external protection for the equipment, to ensure that the
equipment receives the voltage as specified in this manual.
1.1.4. Protection against water and humidity
This equipment is not recommended for use in areas subject to ingress of rain water
etc., or sites with damp floors, or in places which are subject to a high degree of atmospheric
humidity which is liable to condense in the equipment.
1.1.5. Ventilation, fire and inflammable vapours
The equipment must not be placed close to a source of heat. The use of electrical or
electronic equipment near a source of fire or in an atmosphere containing inflammable vapours
is extremely dangerous and must be avoided at all costs.
All the ventilation grilles must remain unobstructed to permit sufficient ventilation and
allow the dissipation of heat to the exterior of the equipment.
1.1.6. Maintenance
Maintenance operations on this unit should only be carried out by qualified technical
personnel. AEQ does not accept responsibility for any damage or injury to the equipment
caused by maintenance by unauthorised persons, nor for any damage or injury to other
equipment or persons caused by any unauthorised repair or maintenance operation.

AEQ BC-300
Broadcast Mixing Console
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CAUTION. A risk of severe electrical shock exists due to very high voltages which are
present in the interior of the power supply unit. Therefore proceed with absolute caution when
manipulating this unit.
The AEQ BC-300 mixing console does not require preliminary adjustment, after
programming has been carried-out as described in this manual either by the user or the
manufacturer, no additional operations whatsoever are necessary to obtain optimum
performance.
WARNING
All manipulation inside the equipment
must be carried out only by qualified
technical personnel.
1.1.7. WARRANTY.
Guarantee period: The terms and conditions are as stated in the Guarantee Certificate
that accompanies the equipment.

AEQ BC-300
Broadcast Mixing Console
7
2. EQUIPMENT POWER SUPPLY
2.1. General
A description of the power supply module connection is detailed in Chapter 5.4.1.
2.1.1. Before connecting the equipment to electrical mains.
CAUTION: Before the equipment is connected to the power supply, the voltage selector
must be checked and if necessary set for the supply voltage as in Chapter 2.1.2. The
procedures detailed in this section must be followed carefully before connecting and operating
the equipment.
2.1.2. Voltage selection
The AEQ BC-300 mixer is designed to operate with a 110/220 V AC power supply. Set
the VOLTAGE SELECTOR (See Chapter 5.4.1. of this manual) to the appropriate mains
network supply voltage.
It is absolutely necessary to check that the Voltage Selector is set to the correct
position for the Voltage in the area that the equipment is going to be used in. If the AC supply
voltage has to be changed, the fuse fitted as standard to the equipment, must be replaced by
the alternative that can be found in the plastic bag containing this manual, and following these
instructions; Remove the fuseholder from the (2) AC POWER connector, located in the rear of
the AEQ BC-300 mixer chassis (See Chapter 5.4.1. of this manual), and replace the existing
fuse with the alternative as mentioned previously. Verify that the new fuse that is fitted is
corresponding to the Voltage selected before proceeding with the substitution.
Remember: 220 V AC Power supply = 0,4 A Type T(slow, not fast blow)
110 V AC Power supply = 0,8 A Type T (slow, not fast blow)
Note: The equipment can be supplied from factory with the power supply pre-set to any
of the Voltages mentioned, 220 or 110 V AC, and with the corresponding fuse fitted.
Note: The mixer AEQ BC-300 power supply cable, can be supplied with a European
Standard or USA type mains interconnecting plug. In certain countries it could be necessary to
exchange this plug to adapt to the prevailing local standards. If this is the case, the substitution
of the plug should be carried out before proceeding.
2.1.3. Switching on the equipment
Once the checks and/or modifications indicated in the Section 2.1.2. have been
accomplished the equipment is prepared for connection to the electrical mains. Prior to
connection of the power cord, ensure that power supply switch POWER is in the off position.
Activate the power supply switch POWER. If all the previous instructions have been
followed correctly, the BC-378 control module LED ON (41), will illuminate indicating that the
equipment is receiving power.
Note: For the location of the power switch and LED indicators mentioned above, refer to
sections 5.3.2. and 5.4.1. of this manual.

AEQ BC-300
Broadcast Mixing Console
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3. AUDIO CONNECTIONS
3. 1. General
The connections of Audio of the Microphone input of the channels BC-311 and the
output MASTER of the module BC-378 have been accomplished according to the AES 14-
1.992 (ANSIS 4.48 - l.992) recommendation. This recommendation is based on IEC 268 - 12 of
1.987. Equipment for sound systems part 12, application of connectors for radio
Broadcast and similar uses.
The Audio connection cables should be checked for compatibility with the standards
indicated. If this is not the case they must be exchanged or modified since problems could be
encountered with the phase of the Audio signal.
MALE pin
connector
FEMALE socket
connector
Equipment Output
Equipment Input
1
2
3
Application and
Power Supply
Balanced Mono
Channel
Unbalanced
Mono Channel
Balanced Mono
Channel
Phantom power
Balanced Mono
Channel
Power A-B
1
Screen
Screen and Return
Screen and Negative
Power
Screen
2 3
Positive Polarity
Positive Polarity
Positive Polarity
and Power
Positive Polarity
and Power
Return
NOTE 1*
Positive Power
Return
Negative Power
Return
NOTE 1*
If a balanced
microphone is
connected to an
unbalanced
amplifier input,
the input
contact 3 is
connected to
contact 1.
CONTACT
* Note. The equipment does NOT dispose of “Phantom Microphone Power Supply.

AEQ BC-300
Broadcast Mixing Console
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4. DESCRIPTION OF THE MIXER
4.1. Basic design concepts
The Audio Mixer AEQ BC-300 has been designed, fundamentally, for its use in small
Radio Broadcast studios, mobile units, journalist cabins and simple sound facilities, where the
relationship price/quality and reliability of the equipment are fundamental factors.
The development and manufacturing criteria of the Audio mixer have been based on
our vast experience in the field of Radio Broadcasting, and the direct contact with the
professionals of this sector, that has made it possible for us to capture the need of a simple
Audio mixer for radio and other applications, with the most current technology and excellent
performance.
Its design and configuration, assure a rapid assimilation by the user of all the functions
of the mixer. The logic distribution of the controls, the incorporation of a telephone hybrid and
the automatic functions of monitor mute and signalling, simplifies the labour of the operator.
Its semi-modular conception allows an easy and rapid maintenance or servicing by
qualified personnel, though it will have to be disconnected from electrical mains before any
service intervention or of repair should be carried out. The high quality of the components used
in the construction guarantees an extended useful life of the equipment.
Below are detailed some of the characteristics that make of the mixer AEQ BC-300 an
excellent equipment for its utilisation in small Radio Broadcast networks and other applications.
- Electronically Balanced Microphone Input Channels.
- VCA Signal Control Faders.
- Transformer Balanced MASTER Outputs.
- Asymmetrical Stereo Line inputs.
- Three asymmetrical stereo outputs for, for example, recording.
- Two Transformer Balanced Auxiliary Mono inputs.
- Two Transformer Balanced Auxiliary Mono outputs.
- All inputs with CUE/PFL.
- Internal telephone hybrid.
- Independent control of Control and Studio headphones.
- 10+10 W. Output of for Studio monitors.
- 24 V. Power Supply for signalling with automatic activation.
4.2. Initial configuration
The Mixer AEQ BC-300 is available in two standard configurations ;
MODEL BC-306: 1 MODULE BC-311 (Double Mic./Line Mono)
1 MODULE BC-322 (Four Double Line Stereo)
1 MODULE BC-378 (Outputs and Control)
3 MODULES BC-302 ( Blank Module)
1 CHASSIS
MODEL BC-312: 2 MODULE BC-311 (Double Mic./Line Mono)
2 MODULE BC-322 (Four Double Line Stereo)
1 MODULE BC-378 (Outputs and Control)
1 CHASSIS

AEQ BC-300
Broadcast Mixing Console
10
5. DESCRIPTION OF MODULES
5.1. BC-311
5.1.1. Functional description
Henceforward are made references continuously numbers and representations of
serigraphy that, emphasised in bold in this manual, are found in the chapters 5.1.2., 5.2.2. and
5.3.2.. For greater comprehension of these references, please consult these chapters during
the reading.
The module of two input channels Mic./Line Mono, BC-311, permits the connection of four
independent inputs; two electronically balanced inputs at microphone level and with Female
XLR-3 connectors (1) and (2), and two asymmetrical, at line level and with RCA connectors (3)
(4), whose selection is accomplished through the switches (7) and (8) MIC./LINE.
·To route/send the input signals to the outputs ; MASTER, AUX. 1 and 2 and
REC. 1, 2, and 3, depress the switches (9) CHANNEL ON for input 1, and (10) CHANNEL ON,
for input 2. These push-buttons not only provide DC power to the module but also enable to
audio signal to pass through the MASTER, AUX and REC outputs. Do not push If not in use.
·With the switch (12) PHONE, the input signal of the selected channel, is sent to
the output of the telephone line.
·To monitor the Audio and the level of the signal originating from the input
selected, depress the corresponding switch (11) CUE. Upon triggering this switch, the Audio
signal originating from the input selected, is sent to the outputs of the monitoring circuits
CUE/PFL, that are activated.
·With the sliding Faders (13), is adjusted and routed the level of the Audio
signal originating from the input selected, to the Outputs; MASTER (MASTER OUTPUT),
Recording (REC. 1,2 and 3), Auxiliary 1 (AUX. 1 OUTPUT), Auxiliary 2 (AUX. 2 OUTPUT), the
monitoring circuits CUE/PFL CUE and telephone line PHONE.
The MODULE BC-311 has one connector 4 mm standard plug or 4mm stackable plug
(PO type) (5-6) C, for each input channel, for the activation of the 24 V. Power Supply signal in
the MODULE BC-378, for the circuits of Monitor Mute and signalling. (see chapter 6.2. of this
manual).