System Configuration Diagrams; Stereo Operation - Quest Engineering QA 1004 User Manual

each other. The A channel handles the positive voltage
swing and the B channel becomes the negative, thus
doubling the output voltage swing. Via the "bridge
output" speaker connector, the speaker is now
connected across the two channels.
Power is proportional to the square of the voltage
swing, so four times the output power is possible. The
reality is that this would exceed the capability of the
output stage but a considerable increase in output will
result all the same.
The minimum load impedance in bridge mono
mode is 8Ω
Caution: In this mode output voltages are high
enough to constitute a shock hazard.
System configuration diagrams

Stereo Operation

Wiring will need to conform to CLASS 1 wiring
standards. Check your local electrical codes for the
appropriate electrical standards.
Output is via the middle Speakon connector. The
output signal is across pins number 1+,1-.
ALWAYS SWITCH OFF AMPLIFIER BEFORE
OPERATING BRIDGE SWITCH
3. Speakon input and output connector wiring.
STEREO
MODE
OFF 35Hz 80Hz STEREO PARALLEL BRIDGE 1.4V 32dB 26dB OUTPUT A
HIGH PASS -A MODE GAIN
OFF 80Hz 110Hz
LOW PASS -A
LINK A INPUT A
PIN1: SIGNAL GND
MODEL:
PIN2: SIGNAL + BRIDGE
PIN3: SIGNAL -
HIGH PASS -B
OFF 35Hz 80Hz
LOW PASS -B LIMITER GROUND
OFF 80Hz 110Hz ON OFF LIFT GROUND OUTPUT B
DESIGNED BY QUEST ENGINEERING,AUSTRALIA
LINK B INPUT B
QA
User Manual
3. SPEAKON CONNECTOR WIRING
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
OUTPUT ASSIGNMENT
PIN 1+ : SIGNAL
Push To Reset
PIN 1- : GROUND
~ 220 240V 10A 50/60Hz
Power Amplifiers
SERIES
2+
1-
2-
1+
9
QA Series User Manual