ILV120
Issue 2 14/09/1999
ECR 1024
LV120 Amplifier
Operating Instructions
Baldwin Boxall Communications Ltd.
Wealden Industrial Estate, Farningham Road
Crowborough, East Sussex, TN6 2JR
Telephone: 01892 664422 Fax: 01892 663146
Iss 2
Page 2 of 8
SAFETY
IMPORTANT NOTES - DO’S AND DON’TS
Ventilation
Always ensure adequate ventilation to the amplifier.
Do not obstruct the ventilation holes in the cover or base.
Should the amplifier exceed its safe operating temperature it will automatically reduce its volume to a
safe level thus allowing it to cool. Once cooled it will operate normally without manual resetting.
AC Power Input - Danger High Voltage
Only connect to an AC 50-60 Hz 230V supply using the lead assembly supplied or an equivalent type
with a suitable IEC connector.
Always ensure that the amplifier is earthed.
Always unplug the power before removing the top cover.
100V Loudspeaker Output - Danger High Voltage
Ensure that the loudspeaker connections are suitably protected and cannot be touched. Always replace
output plug insulated covers.
Always ensure that the total speaker load does not exceed the rating of the amplifier used.
If unsure use an impedance meter to measure the unknown load.
Using a multimeter selected to the resistance range ensure that the speaker line is not connected to
earth.
Moisture
Do not allow water to come in contact with the amplifier and its external connections.
Cable Types
Always ensure that the correct cable type is used for the signal level.
A twin screened cable should be used for balanced inputs operating at mic or line level. Zone
selection and access control cables do not generally require screening and should not share the same
screen as the balanced input.
Loudspeaker output cables should be rated in excess of 100V and the cross sectional area to suit the
load without excessive power loss.
Always ensure that output cables are kept as far away from input cables as possible reducing the risk
of instability.
Fuses
Always replace using the correct rating and type to ensure safe operation.
Iss 2
Page 3 of 8
LV120 USER INSTRUCTIONS
The LV120 is an integrated 5 input 120 Watt free standing or rack-mounting amplifier powered from a 230 Volt
AC supply. Each of the 5 inputs has separate volume, bass and treble controls.
An output level 4 bar LED display indicates at 5% 25% 50% and 100% output.
Both low impedance and 100 Volt line outputs are available on a 4 pin Speakon connector, (pair 1+ and 1-
being 100V and pair 2+ and 2- being low impedance), see fig 1 for connection details. The low impedance
output is unbalanced ref to ground, suitable for driving 4 off 8 Ohm speakers connected in parallel or any other
combination providing that the resulting impedance is no lower than 2 Ohms.
The 100 Volt line output is derived from a transformer that provides a fully floating output.
If a balanced output is required the centre tap may be connected to ground via a link on the Speakon printed
circuit board, see fig 2.
The power output stage is protected against overload conditions, i.e. short circuits etc., by sensing the current
and voltage and presenting this error signal to a drive limiter circuit. Should the amplifier be subjected to an
abnormal load the input to the power amplifier is limited to a safe level. Over temperature protection is also
provided using a sensor attached to the output stage heatsink. Should the temperature exceed 90 C then the
input signal is reduced to a low level preventing permanent damage to the amplifier.
Each of the 5 inputs can be set to either balanced Mic sensitivity (20-600 Ohm, 0.6mV) or balanced Line
sensitivity (80mV) using the relevant DIL switch on the rear panel. These switches also control the Phantom
Power facility (20V DC) for each input.
See fig 3 for details on these switch settings.
Input 5 can use either 2 Phono connectors to enable a compact disk or cassette tape machine to be easily
connected, or if this feature is not required then a DIL switch is provided to switch the input to the XLR
connector.
See fig 3 for details on this switch setting.
Inputs 1 to 4 are provided with input gating and to use any input the relevant input access must be closed to 0
Volts, even if priority is not selected.
When priority is selected using the DIL switches on the rear panel, the relevant input will override all
descending; i.e. input 1 will override inputs 2,3,4 and 5.
See fig 3 for details on these switch settings.
Please note that input 5 is permanently accessed and therefore has no input access connection.
The open collector busy output will become active i.e. conduct to 0 Volts to operate relays, busy indicators etc,
only if the priority is selected and input accessed. A +24 Volt output is provided to power the external relays or
indicators and is protected by a 1 Amp self resetable fuse.
An OPT 33 chime module may be fitted to sound when an input is accessed.
Please note that the chime will only sound with priority selected on the desired input or by closing the chime
trigger input to ground.
The chime pre-set volume and DIL switch to select 1, 2, or 3 notes are mounted on the OPT 33.
Optional signal processing (i.e. Bose loudspeaker equaliser OPTEQ) may be incorporated using the internal
connector provided, see fig 5 for details on mounting this option.
Additional external equipment (e.g. a graphic equaliser) can be inserted between the preamplifiers and power
amplifier by removing the jumper link from the POWER AMP INPUT and PRE AMP OUT phono connectors
on the rear panel.
The external equipment should have an input impedance greater than 5K Ohms and output impedance lower
than 2K Ohms with a nominal level of 800 mV.
Iss 2
Page 4 of 8
Euro Amplifier Integrated Technical Specification
Rated output power
100V line 230V AC supply 120W 83 Ohms
THD 1 kHz rated output
Aux input 230V AC supply Less than 0.5% typically 0.2%
Typical output power 1% THD
Aux input 230V AC supply 100V line 150W 66 Ohms
Low Z - 80W 4 Ohms
Low Z - 130W 2 Ohms
Output regulation (1 kHz 100V line) Better than 1dB
Output voltages obtainable
(Pin selection) 100V & low impedance
Supply voltage AC 220 – 240V 50 – 60 Hz
Power consumption @ 230V
Quiescent
Rated output power @ 1kHz 18VA
300VA
Fuse protection
1 x AC supply 20 x 5mm
2 x DC (amplifier) auto blade type
1 x DC output
3.15A(T)
10A(F)
1A Self Resettable
Aux input phono stereo summed mono
Sensitivity
Frequency response – 3dB
Signal to noise ratio
100mV @ 20K Ohms
Better than 40 kHz – 20 kHz
Better than 80 dB
Tone controls
Bass
Treble ± 12 dB @ 100 Hz
± 12 dB @ 12 kHz
Universal input (line)
Sensitivity
Frequency response – 3dB
Signal to noise ratio
80mV @ 12K balanced
Better than 40 Hz – 18 kHz
Better than 70 dB
Universal input (Mic)
Sensitivity 600µV balanced
Input impedance
Without phantom power
With phantom power 20V 12k Ohms
660 Ohms
Frequency response – 3dB Better than 40 Hz – 18 kHz
Common mode rejection ratio
50 Hz – 30 kHz Better than 60 dB
Signal to noise ratio terminated 200 Ohms Better than 60 dB
LED indicators Output level indicator
5%, 25%, 50% & 100%
Terminations
AC supply input
Aux signal input
Universal input
Input Access
loudspeaker output
3-pin DIN IEC 6A
2 x phono, stereo summed mono
3-pin XLR
6-pin screw terminal connector
4-pin Speakon connector
Fan assisted No
Dimensions (mm) (D x W x H) 340 x 430 x 90
Weight 12 kg
Iss 2
Page 5 of 8
CT-LK
C36C37C38 C35
P14
GND BK Y BL RD W G
OUTPUT CENTRE TAP
1234ON
BOTH OFF = NO PHANTOM POWER
ON = MIC 0.6mV.
OFF = LINE 80mV.
ON = THIS INPUT WILL
OVERRIDE DESCENDING INPUTS
OVERRIDE DESCENDING INPUTS
OFF = THIS INPUT WILL NOT
AND WILL MIX
XLR PHANTOM POWER
XLR SENSITIVITY
PRIORITY INPUTS 1 TO 4
ON = XLR MIC/LINE
OFF = PHONO 100mV
XLR or PHONO - INPUT 5 ONLY
BOTH ON = 20V MIC PHANTOM POWER
12
3
2+
1+
1-2-
1+
1-
2+
2-
0V
100V 100V LINE
+
0V LOW Z
PUSH
BALANCED
INPUT
GROUND
SPEAKON LOUDSPEAKER OUTPUT CONNECTIONS
FIG 1
SPEAKON LOUDSPEAKER
OUTPUT CONNECTOR
BALLANCED 100V LINE SELECTION
FIG 2
ADD LINK TO EARTH PC1210B
FIG 3
DIL SWITCH (1 PER INPUT)
FIG 4
XLR INPUT CONNECTIONS
Iss 2
Page 6 of 8
Fig 5: Location and Orientation of Connectors for OPT33 and OPTEQ
R98
R95ZD25
R100
C83
P9
U7
R57 C65 C75 C76 C74 C73 C77 C70 R60 C69
R73
VR5VR4
REG2 C98
R123
R111
C117
C116 TR8
R138
U10
C119
C82 C129
C110
C118
U13
C120
R114
C103
C115
D28
R136
R137
R113
R74
P10
R75 C80 C81 C72
OPTION
U9
VR6
P13
C71
R62
C68
R61
C121
R146
MASTER
VOLUME I/P4 VOLUME I/P5
+
+
FRONT
HEATSINK
OPT33
MOUNTED
HERE
FIG 5
INSERT 4 x PILLARS FROM SOLDER SIDE
OPT EQ OPTION
COMPONENT SIDE DOWN
IMPORTANT NOTE
PLEASE ENSURE THE CORRECT
ORIENTATION OF THE OPT EQ CONNECTOR
INCORRECT FITMENT WILL RESULT
DAMMAGE TO THE EQUIPMENT.
PC1210
PLUG DOWN ONTO P10 ON EUROAMP BOARD
R1
Iss 2
Page 7 of 8
LV120 BLOCK DIAGRAM
600uV MIC
80mV LINE
INPUT 1
2
3
10V
PHANTOM
POWER MIC/LINE
1
1
+20V
BASS TREBLE
MIXER
EARTH
VIRTUAL
0V
OUT
PHONO
OPTION
SOCKET
0V
800mV
IN
POWER
AMPLIFIER
120W
OUTPUT
MUTE
RELAY
OUTPUT
LEVEL
INDICATOR
100V LINE
OUTPUT
OUTPUT
TRANSFORMER
100%
50%
25%
5%
0V
VOLUME
MASTER
VOLUME
INPUT 1
BASS TREBLE
0V
PHANTOM
POWER MIC/LINE
2
2
+20V
600uV MIC
80mV LINE
INPUT 2
XLR
2
3
1
INPUT 3
XLR
0V
PHANTOM
POWER MIC/LINE
3
+20V VOLUME
INPUT 2
BASS TREBLE
0V
PRIORITY LOGIC
CASCADE OR MIXING
INPUT GATING & BUSY
PROVIDING
SPEAKON
CONNECTOR
1+ 1-
2+ 2-
LOW Z
0V
OUTPUT
ACCESS
INPUT1
INPUT2
INPUT3
1
2
3
VOLUME
INPUT 3
0V
3
+20V
600uV MIC
80mV LINE
XLR
2
3
10V
600uV MIC
80mV LINE
INPUT 4
XLR
2
3
10V
PHANTOM
POWER MIC/LINE
4
4
INPUT 4
BASS TREBLE 4
CHIME
BUSY
0V
CHIME
COMMON
INPUT4
+24V
BUSY
COM
+24V
MAINS
PSU
OPT33
CHIME
VOLUME
BASS TREBLE
5
0V
PHANTOM
POWER MIC/LINE
5
5
+20V
600uV MIC
80mV LINE
INPUT 5
2
3
10V
XLR
PHONO
AUX
0V
0V
VOLUME
INPUT 5
0V
CHIME IS ONLY SELECTED
WHEN PRIORITY IS SELECTED 0V
-33V
+33V
MAINS
SWITCH
FUSE
L
E
NAC 50Hz - 60Hz
230V MAINS I/P
Iss 2
Page 8 of 8
LV120 Front and Rear Panel Illustration
5
010
5
010
5
010
5
010
5
010
5
010
0
+
0
+
0
+
0
+
0
+
0
+
0
+
0
+
0
+
0
+
euroamp
C O M M U N I C A T I O N S
5% 25% 50% 100%
output level
masterinput 5input 4input 3input 2input 1
bass bass bass bass basstreble treble treble treble treble
/
