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USER MANUAL
QSM-606A
QSM-612A
QSM-624A
MIXER AMPLIFIER
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WARNING: THIS APPLIANCE MUST BE EARTHED
IMPORTANT
The wires in the mains lead are coloured
In accordance with the following code:
Green and Yellow: Earth (E)
Blue: Neutra (N)
Brown: Live (L)
As the colours of the wires in the mains
lead of this apparatus may not correspond
with the coloured markings identifying the
terminals in your plug proceed as follows:
The wire which is coloured green and
yellow must be connected to the terminal
which is marked with the letter N or
coloured black. The wire which is
marked with the letter L or coloured red.
If a 13 Amp (B.S.1363) plug or any other
type of plug is used, a 5 Amp fuse must be
fitted either in the plug or at the
distribution board.
GENERAL INSTALLATION
DO NOT run microphone cables near mains, data, telephone or 70V line cables.
DO NOT run 100V line cable near data, telephone or other low voltage cables.
DO NOT exceed 90% of the amplifiers output power when using 70V line (speech
only).
DO NOT exceed 70% of the amplifiers output power when using 70V line (high
level background music).
DO NOT use re-entrant horn loudspeakers for background music unless the loudspeaker has been
specifically designed for this purpose.
AVOID jointing the microphone cable, when this is unavoidable make sure a good
screened connector is used, e.g. Phono.
ALWAYS use a unbalanced or floating low impedance microphone terminating into a
unbalanced input on long microphone cable runs.
ALWAYS use a mains grade double insulated cable for the loudspeaker cable runs.
ENSURE that all loudspeakers are in-phase.
ENSURE that there are no short circuits on the loudspeaker line before connecting to
the amplifier.
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QSM-606A, QSM-612A, and QSM-624A Mixer Amplifier
FRONT PANEL
1. Channel 1 Volume Control 7. Master Tone Control (Treble)
2. Channel 2 Volume Control 8. Master Volume Control
3. Channel 3 Volume Control 9. Power On / Off switch
4. Channel 4 Volume Control 10. Power On / Off indicator LED
5. Channel 5 Volume Control 11. Output Level indicator LED
6. Master Tone Control (Bass)
REAR PANEL
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1. Mains Input Socket 10. Channel 5/Aux 2 Input (6.3 Phone Jack)
2.Power Fuse 11. MIC 4/Aux 1 Selector Switch
3. Earth Connection Screw 12. Channel 4/Aux 1 Input (6.3 Phone Jack)
4. DC Power Supply Terminals 13. MIC 3/Phono Selector Switch
5. Speaker Output Terminals 14. MIC 3/Phono Input (6.3 Phone Jack)
6. Aux Output (6.3 Phone Jack) 15. MIC 2 Input (6.3 Phone Jack)
7. Tape Output (6.3 Phone Jack) 16. MIC 1 Input (6.3 Phone Jack)
8. Aux 3 Level Control 17. Mains Voltage (115V/230V) Selector Switch
9. Aux 3 Input (6.3 Phone Jack)
Mains Connection
The supply transformer has been designed for use on either 115Vac or 230Vac, selected by slide
switch on rear panel. The amplifier is factory set at 230Vac mains voltage.
Battery Connection (24Vdc)
When using external batteries, earth the amplifier via the screw terminal because of the high
voltages present. Electrical stability of the system is increased by earthed the case.
NOTE: the connection cable must be fitted with an in-line fuse. Quick blow type F15A when
Connecting batteries please ensure correct polarity.
Microphone Connection
Mic1~5 inputs are unbalanced standard 6.3 Phone Jack, rear panel.
Mic1 input has VOX priority which will override Channel 3~6 and Line input signals but
NOT the Channel 2 input.
Line (Aux/CD) Connection
The equipment provides an auxiliary input which may be used for connecting other signal
sources such as a Radio Tuner, CD or Cassette player. A slide switch is located on the read panel
for selection of, Channel 4 Mic4→Aux 1 , Channel 5 Aux 2 , Aux3.
The line level Control operates on each of the input sources.
To operate select the desired music source using the slide switch and turn the “Channel” control
clockwise to increase the volume or anticlockwise to reduce the volume.
The Aux / input sockets are standard 6.3 Phone Jack, single sockets are supplied and these are
linked together internally, this allows stereo signal source to be used without the need to obtain
a special lead, however you may wish to check with the manufacturer of the signal source to
ensure that no damage will result if the left and right output channels are put in parallel.
Tape output Connection
These standard 6.3 Phone Jack sockets provide a mixed output suitable for connection to
a tape or Cassette recorder.
Aux out
Connects the mixer/preamplifier stage to the power amplifier stage. The connecting link must be
plugged in for normal operation as a mixer/amplifier. “AUX OUT” is after the tone controls and
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the master volume control.
Power outline voltage complies with power input voltage (IEC voltage).
Loudspeaker Connection
Note: Use only 100V or 70V (Selectable) Line Loudspeakers
Low Impedance (8Ω)
This output allows connection of standard low impedance loudspeakers, the minimum load
impedance must be 8Ω, when to or more loudspeakers are use ensure that they are wired in
such a way that the load impedance is between 16Ω or between (4Ω).
Connecting a Mixer Amplifier to a Power Amplifier
These amplifier can be connected using phono to phono leads from the mixer amplifier PRE out
the power amplifier input RCA socket. Further power amplifier can be connected by connecting
from the output of first power amplifier to the input of the second. Up to three power amplifier
can be connected in this way.
Input must be from power amp in (Rear Panel) (Mic1 XLR Jack)
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QSM-606A, QSM-612A, and QSM-624A Technical Specifications
Type Mixer Amplifier
Model QSM-606A QSM-612A QSM-624A
Mains Voltage AC 115V/ 230V, 50 / 60Hz ± 10% Switchable Supply
Battery Voltage DC 24V (MAX 10% deviation)
Output power Max: 90W 180W 380W
Rated:
60W 120W 240W
Output Speaker outputs:
Music/speech: , 8Ω, 70V, 100V
Tape output: 1V 150KΩ
Aux output: 1V, 150Ω
Inputs Mic.1~5: sensitivity. Adjustable (1mV), 600Ω Unbalanced.
Phono : sensitivity Mono 4mv 100K
Aux 1~3: 150mV, Mono 22K,
Frequency response Mic. 1~Mic 5: 60Hz ~ 15KHz ± 3dB
Aux 4~ 6: 50Hz ~ 20KHz ± 3dB
Phono: cmrr
Total harmonic distortion Less than 1% at 1KHz, rated power
Signal to noise ratio All Volume Controls C.C.W.: 80dB below rated power
Mic 1~ 5: 60dB below rated power
Phono:55 db below rated power
Aux: 80dB below rated power
Tone Controls Bass: ± 10dB at 100Hz
Treble: ± 10dB at 10KHz
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Controls Front Panel
Power switch
5 zone control and all call push switch
Channel 1~5 volume control
Tone controls (Bass, Treble)
Master volume control
Rear Panel:
Mic 3/Phono Slide switch
Mic 4/Auxl Slide switch
Aux 3 volume control
AC 115V / 230V voltage Selector switch
Indicators Power indicator (LED), output level indicators (3 LEDS)
AC power consumption
160W 320W 640W
DC power consumption
4A 8A 15A
Priority Priority level (Mic. 1: 0.3mv)
Channel 1 can mute Channel3 ~5, Aux3
Dimensions ( H x W x D )mm 88(H)x425(W)x305(D)
Weight
8.0Kgs 8.5Kgs 10.6Kgs
Color Black
Mounting options Table top or 19” rack mountable
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