qtxsound QRC12A User manual

QRC active speaker cabinets
User Manual
178.745, 178.748
Features:
•Lightweight, compact design
•2 separate input channels
•Integral 35mm pole-mount
•Mic/line level and for channel 1
•Echo effect for mic. channel

Introduction:
Thank you for choosing the QRC series active speaker cabinet. Please read this manual prior to use.
The QR active speaker range has been designed to serve many varied applications, delivering clear, powerful
sound reinforcement wherever it is needed. Please note: your QRC active speaker cabinet may be supplied with
more than IEC or Fig.8 mains lead. Be sure to use the correct lead, taking note of the outlet voltage and rating.
Warning:
To prevent the risk of fire or electric shock, do not expose this appliance to rain or moisture. To prevent electric
shock do not remove the cover. No user serviceable parts inside. Refer servicing to qualified service personnel.
Safety
•Prior to connecting mains, ensure that the supply voltage is correct and the mains lead is in good condition.
•Avoid ingress of water or particles into the enclosure.
•If the mains fuse blows, refer the unit to qualified service personnel
Placement
•Keep the unit out of direct sunlight and away from heat sources.
•Keep the unit away from moisture or dusty environments.
Control Panel
) MIC/LINE – Input sensitivity switch with LED for Channel
2) CH INPUT BAL – Combo XLR or 6.3mm input Channel
3) GAIN – Gain control for channel input
4) BASS – Bass EQ control for Channel input
5) TREBLE – Treble EQ control for Channel input
6) ECHO – Echo effect level control for Channel
7) OUTPUT BAL – Balanced XLR signal output CH +CH2
8) MASTER VOLUME – Master output control
9) POWER – Mains power switch and LED
0) MAINS INLET – IEC inlet with integral fuse holder
) CH2 INPUT – Twin RCA line input (summed)
2) GAIN – Gain control for channel 2 input
3) BASS – Bass EQ control for Channel 2 input
4) TREBLE – Treble EQ control for Channel 2 input

Operation
•With VOLUME and GAIN controls turned down and power switch off, connect the IEC mains lead to an
appropriate mains outlet.
•If a microphone is to be connected directly into the QRC active speaker, connect it to Channel via XLR or
6.3mm jack and select “MIC” on the sensitivity switch ( ).
•Alternatively, a line level signal may be connected to Channel one providing that “LINE” is selected on the
sensitivity switch.
•Connect output of a mixer or any line level signal via RCA lead into Channel 2.
•If the combined CH +CH2 signal is to continue to further active speakers, connect these from the OUTPUT
BAL line level XLR.
•BASS and TREBLE controls should remain pointing vertically ( 2-o-clock position).
•Press the power switch on and, if the input is connected to Channel , turn the Channel GAIN control up
gradually.
•Whilst turning up the Channel GAIN control, make sure the line or mic signal is being fed into the
Channel input at its maximum level by either turning up the mixer or line input device to full volume or
making the loudest sound through the microphone.
•Paying attention to the LED at the top of the Channel section, increase GAIN until the LED begins to
illuminate red and then turn down slightly until the red illumination disappears.
•For Channel 2, increase the GAIN part way to allow some signal through to the speaker to check the sound
•Turn up the MASTER VOLUME control until the input signal is heard through the speaker and continue
increasing until the desired volume level is reached.
•If the channel 2 signal is too low at this point, increase the GAIN to the desired level, taking care to avoid
the signal distorting.
•Each channel has BASS and TREBLE EQ controls which may be adjusted to the desired tone
•Channel has an ECHO control which adjusts the level of echo effect applied to the microphone input for
singers
•When using a microphone, care must be taken to avoid feedback (loud squealing or howling sounds
caused by the microphone being able to “hear” its own sound through the speaker) This can be avoided by
keeping the microphone faced away from the speaker and avoiding high settings of GAIN, TREBLE, BASS
and ECHO controls.
•Before switching the QRC active speaker off, turn down the MASTER VOLUME control to avoid loud clicks
through the speaker.
•Remove the power lead if the unit is not to be used for long periods of time

Cleaning
Use a soft cloth with a neutral detergent to clean the cabinet, panel and controls.
To avoid damage, do not use solvents to clean this equipment.
Specifications
QRC12A QRC15A
Power supply 220-240Vac 50/60Hz (IEC)
Main driver 30cm ( 2”) 38cm ( 5”)
HF Unit 2.5cm ( ”) titanium compression driver
HF Dispersion 90° x 40°
Output power (max) 500W 700W
Output power (RMS) 250W 350W
Frequency Response 45Hz - 20kHz 35Hz - 20kHz
Sensitivity 99dB 0 dB
Crossover Frequency 3kHz 2.5kHz
Dimensions 625 x 360 x 325mm 730 x 450 x 380mm
Weight 4kg 22kg
Troubleshooting
Check POWER switch is on
No output and no LEDs lit Check mains lead is connected and fuse hasn’t blown
Check leads are OK and connected properly Power LED lit but no sound from external
inputs Check VOLUME and GAIN controls are not fully down
Check that MIC/LINE switch is not switched to “MIC” for a line
signal
Distorted output
Reduce GAIN control on the relevant channel until signal is clean
Microphone output very low Check that MIC/LINE switch is not switched to “LINE” for a mic.
signal
© QTX Sound 2011