USER MANUAL
QSB-612E
QSB-624E
BOOSTER AMPLIFIER
1. Security Precautions
◎ Carefully to READ the instruction in this manual before use.
◎ Certainly to OBSERVE the INSTRUCTION in this manual regard convention of safety
symbols and messages.
◎ Please KEEP this user MANUAL nearby for anytime reference.
Safety symbol and Message Conventions
Below-described safety symbol and messages are to prevent bodily injury and property
damage. Before operating the amplifier, read this manual first so you completely knowing
the potential safety hazard and understanding the meaning of the safety symbols and
messages.
WARNING
Indicates a potentially hazardous situation, which, if
mishandled, could result in death or serious body
injury, and/or property damage.
CAUTION
Indicates a potentially hazardous situation, which, if
mishandled, could result in moderate or minor body
injury, and/or property damage.
PANEL DESCRIPTION
■ When Installing the Amplifier
DO NOT installing or mounting the amplifier in unstable locations, such as on the
rickety table or the slanted surface. It may result in the amplifier falling down and
causing body injury and/or property damage.
Be sure to ground to the safety ground (earth) terminal to avoid electric shock.
Never to ground to a gas pipe for tragic disaster may occur.
Use the amplifier only with the voltage specified on the amplifier. Using the
voltage higher than specified may cause fire or electric shock.
DO NOT cut, twist, damage, nor modify the power supply cord. In addition, avoid
using the power cord close to heaters, and don’t place heavy object, including the
amplifier itself, on the power cord, for it may cause fire or electric shock.
DO NOT expose the amplifier to rain or the environment where it may be splashed
by water or other liquids, for doing so, it may cause fire or electric shock.
WARNING
▓
▓▓
▓ When using the Amplifier
When found following irregular situation during amplifier is in use, immediately switch
off the power, disconnect the power supply plug from the AC outlet. Don’t try to
operate the amplifier again. Contact your local dealer to check the amplifier.
The amplifier falls.
Amplifier is malfunction.
Water or any metallic object gets into the amplifier.
The smoke or strange smell coming from the amplifier.
The power supply cord is damaged, such as exposure of the core, disconnection
etc..
DO NOT put cups, bowls, or other containers with liquid or metallic object in it on
the top of the amplifier. If they spill accidentally into the amplifier, it may result in
fire or electric shock.
DO NOT Touch the power supply plug during thundering and lightning, for it may
result in electric shock.
DO NOT insert or drop the metallic objects or flammable materials into the
ventilation slots of the amplifier, for it may result in fire or electric shock.
DO NOT open nor remove the amplifier cover to prevent fire or electric shock, for
there are high voltage components inside the amplifier.
PANEL DESCRIPTION
■ When Installing the Amplifier
DO NOT remove nor plug in the power supply plug with wet hands, for it may
cause electric shock.
When unplug the power supply cord, be sure to grasp the power supply plug.
DO NOT pull on the cord itself. Operating the amplifier with damaged power
supply cord may cause fire or electric shock.
Avoid installing the amplifier in humid or dusty places, the area exposed to the
direct sunlight, locations generating smoke or steam, or the spot near the heaters.
It may result in fire or electric shock.
When moving the amplifier, be sure to remove its power supply cord from the wall
outlet. Moving the amplifier with the power cord connected to the outlet may
cause damage to the power cord, and resulting in fire or electric shock. When
removing the power cord, be sure to grasp its plug to pull.
DO NOT Block the ventilation slots of the amplifier chassis. It will cause the
temperature rising and result in fire.
CAUTION
■ When Using the Amplifier
Make sure that the volume control is turned to minimum position before power is
switched on. Loud sound produced at high volume when power is switched on may
impair hearing.
DO NOT place heavy objects on the amplifier, for it may cause it fall and may result
in body injury and/or property damage. Besides, the object itself may cause
damaged or body injury.
DO NOT operate the amplifier for the extended period of time with the sound
distorting. It is an indication of malfunction, which can cause heat and result in fire.
Switch the power off, and unplug the power supply plug from the AC outlet for safety
purposes, when cleaning or leaving the amplifier unused for 7 days or more. Fire or
electric shock may occur.
If the dust accumulates on the power supply plug or in the wall AC outlet, fire may
result in. Clean it periodically. In addition, make sure the plug is inserted in the
wall outlet securely.
Contact your local dealer to clean the dust, it the dust has accumulated in the
amplifier for a long period of time. Dust accumulation may result in fire or damage.
2. Description
QSB-6xxE series booster amplifiers cover models from 120W RMS to 480W RMS. This
manual is to for 120W QSB-612E and 240W QSB-624E.
QSB-6xxE series is the most easy to use booster amplifier. It has XLR and phone jack
inputs. And it also has XLR and phone jack output for the connection to another amplifier..
It equips speaker screw terminal for the direct connection to the speaker of 8 ohm, or 70V,
or 100V speaker.
The sensitivity selection switch on the rear is for the sensitivity of 100mV or 1V selection.
Another slide switch is for “Mono” or “Parallel” selection. The gain control is for the control
of input signal..
Besides 115 / 230V AC power source, QSM-6xxE series booster amplifier also accept DC
24V battery power source as backup power.
To ensure the amplifier working normally and safe operation, it has speaker short, over
temperature, and overload protection function.
QSM-6xxE series is simple and easy to use booster amplifier.
3. Panel Description
FRONT PANEL DESCRIPTION
1. Power On Indicator LED 3. Power Switch
2. Level Indicator LED
REAR PANEL DESCRIPTION
1. AC Voltage (115V/230V) Selection Switch 8. XLR Output
2. AC Fuse 9. Parallel/Mono Switch
3. AC Power Input Socket 10. Sensitivity (100mV /1V) selection Switch
4. Earth Connection Screw 11. Gain Control
5. DC Power Supply Terminal 12. XLR Input
6. Speaker Output Terminal 13. Phone Jack Input
7. Phone Jack Output
4. Features
Easy to use booster Amplifier
XLR and phone jack input with sensitivity selection switch
Input gain control
Parallel/Mono selection
8 ohm, 70V and 100V speaker output
XLR and phone jack output
Overload, over temperature, and speaker short protection.
AC or DC power in
2U height
19” rack or table mounted
5. Power Source
AC Power Source
The supply transformer has been designed for AC 230V /115V (±10%) 50 /60 Hz.
DC Power Source
Battery Connection (24Vdc)
When using external batteries, ground the amplifier via the screw terminal. (Electrical
stability of the system will be improved by providing a good earth ground.) When
connecting batteries, please ensure correct polarity.
6. Connection
Input Connection
Connect signal source to input jack by using phone jack cable.
Output Connection
Connect output jack to other amplifier by using phone jack cable.
Speaker Output Connection
The speaker output screw terminal is on the rear panel. It can connect low
impedance 8 ohm, or high-level 70V or 100V speaker. Use only one of these output
connections for corresponding speaker.
Sensitivity Selection Switch
Put the switch on 100mV or 1V position for corresponding sensitivity of signal source
from other device.
“PARALLEL /MONO” Switch
Put the switch on “PARALLEL” or “MONO” position for the need.
7. Operation
After all connections are completed, turn on the power. If necessary, turn the gain control
on the rear panel to what you desire.
8. Technical Specification
Type Booster Amplifier
Model QSB-612E QSB-624E
Output Power (RMS) 120W 240W
Main Voltage AC 115V or 230V 50/60Hz Power Supply
Battery Voltage
DC 24V
Total Harmonic Distortion <= 1% @ 1KHz, rated power
Sensitivity 1V, 100mV @ 10K ohm
Outputs 8Ω, 70V, 100V
Signal to Noise Ratio4 86 dB
Indicator Power On, Level
AC Power Consumption 320W 640W
DC Power Consumption 8A 15A
Dimensions (mm) 88(H) x 425(W) x 305(D)
Weight 8.2 Kgs 10.6 Kgs
Mounting options Desktop or 19” rack
WARNING: THIS APPLIANCE MUST BE EARTHED
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