Quest Engineering QTA 2120P User manual - Power Source
QTA
2120P/2240P
User Manual
User Manual
Q-Tech Commercial Series
QTA 2120P/2240P
4
Power Source
AC Power Source
The supply transformer has been designed for
use AC 240V(±10%) 50 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
Pin Assignments:
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)
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:
Installation Practice
Step 1 .
Take a piece of figure-8 cable,
connect the stripe/coloured wire to the 100V
terminal and the uncoloured wire to the COM
on the amplifier terminal strip.
Step 2 .
Connect the other end of the wire
(uncoloured) to the Com/EARTH connection
on the ceiling speaker transformer and the
other + (strip) wire to the required voltage
taping.
Step 3 .
Take a second piece of figure-8 cable
and connect the plain wire to the parallel
COM connection and the other + (stripe) wire
to the parallel output from the transformer
terminal block and connect it in the same way
to the next ceiling speaker.
Step 4 .
Continue this process until all the
ceiling speakers are connected in a parallel
connection with all the COM connections
and all the wattage connections following a
parallel connection.
For best performance when using long lines
between microphones/mixer and or amplifier
use balanced lines. These have the effect of
canceling out any noise or hum that may be
induced into the cables.
100V
Up to 50m
AWG25-26 (0.15mm2)
50m - 200m
AWG20 (0.5mm2)
Over 200m
AWG18 (0.75mm2)
70V
Up to 50m
AWG24 (0.20mm2)
50m - 200m
AWG17 (1.0mm2)
Over 200m
AWG16 (1.5mm2)
Low
Impedance
(4
Ω)
Up to 10m
AWG18 (0.75mm2)
10m - 30m
AWG13 (2.50mm2)
1
3
2
Plug
1
3
Socket
2
Viewed from Solder
Side of Plug/Soceket