Toa BG-115 User manual

MIXER POWER AMPLIFIER BG-115
BG-130
OPERATING INSTRUCTIONS
The lighting flash with arrowhead within a
triangle is intended to tell the user that
parts inside the product are a risk of
electric shock to persons.
The exclamation point within a triangle is
intended to tell the user that important
operating and servicing instructions are
in the papers with the appliance.
TOA Corporation
Please follow the instructions in this manual to obtain the optimum results from this unit.
We also recommend that you keep this manual handy for future reference.
TO REDUCE THE RISK OF ELECTRICAL
SHOCK, DO NOT REMOVE COVER. NO
USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL

1. SAFETY PRECAUTIONS .................................................................................................................. 3
2. GENERAL DESCRIPTION 5
3. FEATURES ...................................................................................................................................... 5
4. NOMENCLATURE
Front Panel ...................................................................................................................................... 6
Rear Panel ..................................................................................................................................... 7
5. INPUT CONNECTIONS ............................................................................................................. 8
6. OUTPUT CONNECTIONS 8
7. MUTING FUNCTION 9
8. MIC/TEL INPUT IMPEDANCE SELECTION ......................................................................................... . 9
9. JUMPER WIRE SETTING ......................................................................................................... 9
10. OPERATION ...................................................................................................................................
9
11. RACK MOUNTING ................................................................................................................ 10
12. VOLUME SETTING .................................................................................................................... 11
13. VOLUME CONTROL COVER 11
14. DIMENSIONAL DIAGRAM ...................................................................................................... 11
15. SPECIFICATIONS ..................................................................................................................... 12
TABLE OF CONTENTS
2
...........................................................................................................
...................... .....................................................................................
......................................
.
..........................................................................................
...................................................................................................

IMPORTANT SAFETY INSTRUCTIONS
· Be sure to read the instructions in this section carefully before use.
· Make sure to observe the instructions in this manual as the safety messages regarded as very important
precautions are included.
· We also recommend you keep this instruction manual handy for future reference.
Do not block any ventilation openings.
Doing so may cause heat to build up inside the unit and result in fire.
Avoid installing the unit in humid or dusty locations, in locations exposed to the direct sunlight, near the
heaters, or in locations generating sooty smoke or steam as doing otherwise may result in fire or electric
shock.
Do not defeat the safety purpose of the polarized or grounding type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide
blade or the third prong is provided for your safety. When the provided plug does not fit into your outlet,
consult an electrician for replacement of the obsolete outlet.
Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and
the point where they exit from the apparatus.
Only use the attachments or accessories specified by the manufacturer.
Use only with a cart, stand, tripod, bracket, or table specified by the manufacturer, or
sold with the apparatus. When a cart is used, use caution when moving the
cart/apparatus combination to avoid injury from tip-over.
Unplug this apparatus during lightning storms or when unused for long periods of time.
Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been
damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have
fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or
has been dropped.

1. SAFETY PRECAUTIONS
Be sure to read the instructions in this section carefully before use.
Make sure to observe the instructions in this manual as the conventions of safety symbols and messages
regarded as very important precautions are included.
We also recommend you keep this instruction manual handy for future reference.
Safety Symbol and Message Conventions
Safety symbols and messages described below are used in this manual to prevent bodily injury and property
damage which could result from mishandling. Before operating your product, read this manual first so you are
thoroughly aware of the potential safety hazards as well as understand the safety symbols and messages.
Indicates a potentially hazardous situation which, if mishandled,
could result in death or serious personal injury.
Indicates a potentially hazardous situation which, if mishandled,
could result in moderate or minor personal injury, and/or property
damage.
WARNING
CAUTION
WARNING
When the Unit is in Use
Should the following irregularity be found during
use, immediately switch off the power, disconnect
the power supply plug from the AC outlet and
contact your nearest TOA dealer. Make no further
attempt to operate the unit in this condition as this
may cause fire or electric shock.
• If you detect smoke or a strange smell coming
from the unit.
• If water or any metallic object gets into the unit
• If the unit falls, or the unit case breaks
• If the power supply cord is damaged (exposure
of the core, disconnection, etc.)
• If it is malfunctioning (no tone sounds.)
To prevent a fire or electric shock, never open nor
remove the unit case as there are high voltage
components inside the unit. Refer all servicing to
your nearest TOA dealer.
Do not place cups, bowls, or other containers of
liquid or metallic objects on top of the unit. If they
accidentally spill into the unit, this may cause a fire
or electric shock.
Do not insert nor drop metallic objects or
flammable materials in the ventilation slots of the
unit's cover, as this may result in fire or electric
shock.
Do not touch a power supply plug during thunder
and lightning, as this may result in electric shock.
When Installing the Unit
Do not expose the unit to rain or an environment
where it may be splashed by water or other liquids,
as doing so may result in fire or electric shock.
Use the unit only with the voltage specified on the
unit. Using a voltage higher than that which is
specified may result in fire or electric shock.
Do not cut, kink, otherwise damage nor modify the
power supply cord. In addition, avoid using the
power cord in close proximity to heaters, and
never place heavy objects -- including the unit
itself - on the power cord, as doing so may result
in fire or electric shock.
Be sure to replace the unit's terminal cover after
connection completion. Because the voltage of up
to 70 V is applied to the high impedance speaker
terminals, never touch these terminals to avoid
electric shock.
Be sure to ground to the safety ground (earth)
terminal to avoid electric shock. Never ground to a
gas pipe as a catastrophic disaster may result.
Avoid installing or mounting the unit in unstable
locations, such as on a rickety table or a slanted
surface. Doing so may result in the unit falling
down and causing personal injury and/or property
damage.
3

The AC power output is specified on the AC outlet
of the unit. Never exceed the specified wattage on
the unit when connecting equipment. Doing so may
cause fire or property damage.
CAUTION
When Installing the Unit
Never plug in nor remove the power supply plug
with wet hands, as doing so may cause electric
shock.
When unplugging the power supply cord, be sure
to grasp the power supply plug; never pull on the
cord itself. Operating the unit with a damaged
power supply cord may cause a fire or electric
shock.
When moving the unit, be sure to remove its power
supply cord from the wall outlet. Moving the unit
with the power cord connected to the outlet may
cause damage to the power cord, resulting in fire
or electric shock. When removing the power cord,
be sure to hold its plug to pull.
Do not block the upper panel ventilation slots in the
unit's cover. Doing so may cause heat to build up
inside the unit and result in fire.
Avoid installing the unit in humid or dusty locations,
in locations exposed to the direct sunlight, near the
heaters, or in locations generating sooty smoke or
steam as doing otherwise may result in fire or
electric shock.
When the Unit is in Use
Do not place heavy objects on the unit as this may
cause it to fall or break which may result in
personal injury and/or property damage. In
addition, the object itself may fall off and cause
injury and/or damage.
Make sure that the volume control is set to
minimum position before power is switched on.
Loud noise produced at high volume when power
is switched on can impair hearing.
Do not operate the unit for an extended period of
time with the sound distorting. This is an indication
of a malfunction, which in turn can cause heat to
generate and result in a fire.
Contact your TOA dealer as to the cleaning. If dust
is allowed to accumulate in the unit over a long
period of time, a fire or damage to the unit may
result.
If dust accumulates on the power supply plug or in
the wall AC outlet, a fire may result. Clean it
periodically. In addition, insert the plug in the wall
outlet securely.
Switch off the power, and unplug the power supply
plug from the AC outlet for safety purposes when
cleaning or leaving the unit unused for 10 days or
more. A fire or electric shock may result.
4

2. GENERAL DESCRIPTION
TOA's BG-115 and BG-130 are mixer/power amplifiers, and can mix up to three signals. Rated at 15 watts
(BG-115) and 30 watts (BG-130), these amplifiers are ideal for applications that require small sound
reinforcement systems. Any microphone with impedance of less than 600 can be connected. Setting the
Mic/Tel selector switch to the "TEL" position allows the BG-115 (BG-130) to function as an amplifier for paging
made from the telephone. Because the Program input is 10 k in impedance and is of electrically-balanced
type, it can be connected to both balanced and unbalanced types of equipment. When the muting and
grounding terminals are shorted, the override facilities mean that the microphone (telephone paging) input
mutes both the program and AUX input. The amplifiers also come with independent bass and treble controls
for the program and AUX inputs, which increase and decrease specific frequencies. Transformer-isolated
output terminals are provided for connection of 4 speakers or for 25 V or 70 V line applications. The BG-115
(BG-130) can be mounted in an equipment rack using the optional Rack Mounting Kit.
3. FEATURES
Three-channel mixer/power amplifier
Wide frequency range of 50 Hz - 20 kHz (± 3 dB)
Low distortion and low noise level
Bass and treble controls
Built-in muting circuit
Balanced inputs (2 inputs)
Microphone/Telephone Paging input (selectable)
Overcurrent and thermal protection for the power amplifier stage
Three different output impedance: 4 ohms, 25 and 70 V
Small in size and light in weight
Mountable on a desk or in an equipment rack
5

4. NOMENCLATURE
[ Front Panel ]
Power switch
Power is switched on and off with each
depression of this switch.
Power indicator
Lights green-when the power is switched on.
Signal level indicator
Lights green when input signal levels exceed -30
dB.
Peak indicator
Lights red when signal levels approach the signal
clipping point. When this lamp remains lit, adjust
the input level control so that the indicator flashes.
Program input volume control
Adjusts the gain of the Program input. The gain
increases as the control is turned clockwise.
Mic/Tel input volume control
Adjusts the gain of the microphone or telephone
paging. The gain increases as the control is
turned clockwise.
6

[ Rear Panel ]
AC power cord
Connects to the wall AC outlet.
AC outlet (Unswitched)
Supplies power of up to 500 W to auxiliary
equipment.
Output terminals
Connect to speakers.
MOH output terminals (transformer-isolated
output)
Connect to the telephone system.
Muting terminals
Shorting this terminal mutes signals input to the
muting circuit.
Program input
Electrically-balanced input, 10 kohms.
Mic/Tel input
Transformer-isolated input (Mic: 600 ohms, Tel:
10 kohms).
MOH volume control
Adjusts the gain of the MOH amplifier.
Bass control
Increases the low frequency response when
turned clockwise, and decreases the response
when turned counter-clockwise. The center
position provides the flat response.
Treble control
Increases the high frequency response when
turned clockwise, and decreases the response
when turned counter-clockwise. The center
position provides the flat response.
Sensitivity control
Adjusts the sensitivity of the muting circuit.
Mic/Tel selector switch
Select either position depending on the type of
equipment connected to the Mic/Tel input.
AUX volume control
Adjusts the gain of the AUX input. Clockwise
rotation increases the gain.
AUX input (dual RCA phone jack)
Unbalanced input, 10 kohms.
7

8
5. INPUT CONNECTIONS
Mic/Tel input connections Program input connections
MIC
Input source
Input source
• AUX input connections
Input source
Input source
6. OUTPUT CONNECTIONS
• Output terminals
The amplifier has three speaker outputs: 4 , 25 V and 70 V. Use only one of these outputs for connection.
Class 2 wiring may be used.
Note : The impedance in the figure below represents the total impedance of the speaker system.
• MOH output terminals
The amplifier's MOH output is 1w/8

7. MUTING FUNCTION
Announcements made using the Mic/Tel input take precedence, decreasing the sound volume of all current
broadcasts from equipment connected to the Program or AUX input. The interrupted broadcasts are
automatically restored gradually after Mic/Tel input announcement completion. Use the sensitivity control to
determine the threshold value for muting. Turning the control clockwise increases the sensitivity, while the
counter-clockwise rotation decreases the sensitivity.
When operating an external muting function (muting from the terminal block), short the muting terminals of the
terminal block on the rear panel. Signals to the AUX input and Program input are muted. Turn the sensitivity
control fully counterclockwise when using this function.
The BG-115 (BG-130) is set to mute the AUX and Program inputs by the
factory. To mute the Mic/Tel input instead of the AUX/Program inputs, change
the position of the jumper on the internal circuit board.
Important: This change must be made by an authorized electrician.
Factory-setting
8. MIC/TEL INPUT IMPEDANCE SELECTION
The Mic/Tel input impedance selector switch is set to 10 k by the factory.
To change the setting to 600 , set a jumper on the internal circuit board to
600
.
Important: This change must be made by an authorized electrician.
Factory-setting
9. JUMPER WIRE SETTING
The amplifier is set by the factory to send AUX and Program inputs to both the output terminals and MOH
output terminals. This setting can be changed as shown in the table below by cutting JP202 and JP203
jumpers on the internal circuit board.
Cut of JP202
Cut of JP203
Output terminal
Outputs only the Program input.
(AUX input is cut off.)
Outputs both AUX and Program inputs.
MOH output terminal
Outputs both AUX and Program inputs.
Outputs only the AUX input.
(Program input is cut off.)
Factory-setting
JP202
JP203
Important: This change must be made by an authorized electrician.
10. OPERATION
After completing all connections, turn on the power switch, and check to confirm that the power indicator
lights.
Note : When the heat sink temperature exceeds 105°C, the protection circuit begins to operate to disconnect
the output from the circuit. The disconnected output is automatically restored as soon as the
temperature returns to the normal operating range.
9

11. RACK MOUNTING
To mount the BG-115 (BG-130) in a standard 19-inch equipment rack, use the optional MB-25B-BK or MB-
25B-J Rack Mounting Kit.
[MB-25B-BK]
Attach the MB-25B-BK to the amplifier using the supplied four screws. When using other screws, see to it that
each screw is shorter than 15 mm.
MB-25B-BK
MB-25B-BK
4x16 screw included in MB-25B-BK
4x15tapping screw included in MB-25B-BK
[MB-25B-J]
The MB-25B-J is designed to mount two BG-115s (BG-130s) in a single rack. When using this bracket,
remove four plastic feet provided on the bottom surface of each amplifier and joint the two amplifiers with a
metal connector, as illustrated below. Then attach the brackets using the supplied four screws. When using
other screws, see to it that each screw is shorter than 15 mm.
MB-25B-J
MB-25B-J
4x16 screw included in MB-25B-J
PF-511 perforated panel (1-unitsize)
When mounting two or more amplifiers in the rack, insert the
Perforated Panel PF-511 between amplifiers for ventilation
inside the rack. Contact the shop from where the amplifier
was purchased as to the Perforated Panel.
10

12. VOLUME SETTING
Output levels are adjustable with individual volume controls. For music play or announcement, adjust the
corresponding volume control so that the signal indicator lights intermittently. Note that the sound quality is
downgraded when the peak indicator remains lit.
13. VOLUME CONTROL COVER
YA-920 (Black)
(OPTION)
To prevent the accidental change of the settings of the Program input and Mic/Tel input volume controls,
remove their knobs after setting them to the desired position and attach the optional cover YA-920 instead.
14. DIMENSIONAL DIAGRAM
unit: mm
11

15. SPECIFICATIONS
Model
Type
Output Power
BG-115 BG-130
3-channel mixer power amplifier
15 W RMS
30 W RMS
Frequency Responce
Total Harmonic Distortion
Inputs
Input Sensitivity and Impedance
Outputs (Transformer-isolated)
MOH Output
Output Regulation
Signal-to-Noise Ratio
(Band pass 20 - 20,000 Hz)
(Tone controls : set at center)
Tone Controls
Controls
50 - 20,000 Hz (± 3 dB)
0.5 % or less, at 1 kHz, rated output
0.1 % or less, at 1 kHz, 5 W output
Mic/Telephone page input
Program input
AUX input
Mic : 1 mV (-60 dB) , 600 ohms, balanced
Telephne page : 100 mV (-20dB), 10 kohms, balanced
Program : 315 mV (-10 dB), 10 kohms, electrically-balanced *
AUX : 315 mV (-10 dB), 10 kohms, unbalanced
Balanced 4 ohms, 25&70 volts
Balanced 1 W (8 ohms)
Less than 2.0 dB, no load to full load
Mic : 60 dB
Telephone page : 75 dB
Program : 75 dB
AUX : 75 dB
Bass : ± 10 dB at 100 Hz
Treble: + 10 dB at 10 kHz
Controls affect only program input and aux input.
1 Mic/Tel gain control
1 Program gain control
1 AUX gain control
1 Bass tone control
1 Treble tone control
1 MOH control
1 Sense control
1 Mic/Tel selector switch
1 Power ON/OFF switch
Indicators
Power Consumption
Other Features
Color
Dimensions
Weight
1 Power LED, 1 Signal LED, 1 Peak LED
50 W
90 W
Automatic electronic drive limiter
Electronic muting
Black
210(w)x93(h)x276(d)mm
3.3 kg
3.9 kg
* Can be converted into the transformer-isolated input by installing an optional transformer.
Note : The design and specifications are subject to change without notice for improvement.
D331200370
TOA Corporation