QUAD CONCOURSE Q - 2 - REV 1, Instruction Booklet, Page: 8 / 12

8
CONNECTIONS & OPERATION
CAUTION: Before connecting this unit to the AC power supply
please ensure that the Voltage Selector Switch is set correctly for
the voltage in your region and that you are using a suitable
power cable.
The Q6A and Q8A may be connected to either a balanced audio
system or an unbalanced source. Typically, balanced connections
are preferred. Balanced connections are less likely to respond to
radio frequency interference or cross-talk from other sources, and
allow for longer cable runs. Unbalanced connections are accept-
able only where the mixer does not offer balanced outputs and
where the cable runs are less than 5m/15’.
Determine where the speakers will be placed and ensure that there
is AC power available nearby. In instances where there is no local
power outlet you may need to provide an extension cable. Ensure
that all local and national electrical codes are observed and that
the power cable used is properly rated. If in doubt consult with a
certified electrician or electrical engineer.
BALANCED CONNECTIONS
Balanced connections require a quality, two-conductor shielded
cable. Balanced connections require one conductor for the positive
(+) signal and one conductor for the negative (-) signal, a third
conductor (shield) to create a direct connection to ground (Earth).
Remove the detachable connector plug supplied with the speaker.
Prepare the cable by stripping each conductors’ insulation 6mm
(¼"). Insert each conductor into the appropriate position, noting
polarity and tighten the corresponding screw firmly. Once all wires
have been terminated inspect the connector plug to ensure that
there are no stray wire strands that could cause a short-circuit.
Balanced lines may be extended in parallel between speakers,
allowing several speakers to be driven from one mixer output.
However this configuration will present the signal source with a
lower impedance than it would typically drive and may cause
added distortion or even damage to the source outputs. The
recommended method for connection of multiple Q6A and Q8A
active loudspeakers to one source output is through use of a
suitable active distribution amplifier or passive splitter.
UNBALANCED CONNECTIONS
For unbalanced operation connect the mixer or preamplifier
directly to the RCA input by means of a standard unbalanced
RCA cable. Unbalanced connections employ one conductor to
pass the audio signal and a second conductor to act as both au-
dio common and shield. Unbalanced connections are susceptible
to radio frequency interference and electromagnetic interference
which may cause the speaker to hum, buzz or even rebroadcast
audio signals. For this reason, observe the following guidelines
when making unbalanced connections:
• Don’t use cables longer than 5m (15')
• Avoid running cables near electric motors, appliances,
television sets or other sources of electromagnetic
interference
• Ensure that the speakers and mixer, or preamplifier, are
all connected to the same AC power circuit to prevent
possible ground loops
OPERATION
Ensure that the power switch is in the OFF position before
connecting the power cable to the AC Input socket. Connect the
cable to a nearby AC Mains outlet and the then plug in the audio
input cable. Rotate the volume control counter-clockwise to the
minimum setting before switching the power on. Start the program
source and set the preamplifier or mixer gain to a nominal level.