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QTA-1120P/1240P
User Manual
Power Source
AC Power Source
The supply transformer has been designed for
AC 240V /115V (±10%) 50 /60 Hz.
DC Power Source
Battery Connection (24Vdc)
When using external batteries, please ensure
the amplifier is grounded 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.
Main Connections
Each input has XLR and Phone jack input.
Use the one you want
4
Pin Assignments:
2
1
3
Plug
Balanced Audio (3 pole XLR):
Pin 1:
Ground / Screen
Pin 2:
In phase / +ve / Hot
Pin 3:
Out of phase / -ve / Cold
Unbalanced Audio (3 pole XLR):
Pin 1:
Ground / Screen
Pin 2:
Signal
Pin 3:
Ground / Screen (connect to pin 1)
For best performance when using long lines
between microphones/mixer and or amplifier
use balanced lines. These have the effect of
cancelling out any noise or hum that may be
induced into the cables. the amplifier to be
processed externally and then returned to the
power amplifier section of the amplifier. The
connecting link must be plugged in for normal
operation as a mixer/amplifier. "PRE OUT" is
after the tone controls and the master volume
User Manual
Q-Tech Commercial Series
QTA-1120P/1240P
2
1
Viewed from Solder
3
Side of Plug/Soceket
Socket
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.
As a guide for the correct gauge of wire, we
recommend the following:
Up to 50m
50m - 200m
100V
Over 200m
Up to 50m
70V
50m - 200m
Over 200m
Low
Up to 10m
Impedance
(4Ω)
10m - 30m
Sensitivity Selection Switch
Place the switch on 100mV or 1V position for
corresponding sensitivity of signal source
from other devices.
Booster Output Connection
Use XRL (female) or phone jack to connect
booster output to another amplifier.
Parallel / Mono Switch
The amplifier includes both male and female 3
pin XLR connectors, labeled input and output.
While the female is normally used as the input
to the amplifier, both XLR's are connected
in parallel so either will work. When signal
is connected to one XLR, the other XLR
becomes a line level output allowing the
input signal to be distributed (split) to other
amplifiers. In some projects, the same input
may be looped through to multiple amplifiers
using this method. Up to 6 amplifiers can be
looped together without any noticeable loss
in level. A distribution amplifier should be
used when more than 6 amplifiers need to be
looped.
AWG25-26 (0.15mm2)
AWG20 (0.5mm2)
AWG18 (0.75mm2)
AWG24 (0.20mm2)
AWG17 (1.0mm2)
AWG16 (1.5mm2)
AWG18 (0.75mm2)
AWG13 (2.50mm2)
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