Operation; Cleaning; Specifications; Troubleshooting - Qtx QS12A User Manual

Operation


With master LEVEL control 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 QS active speaker, connect it to either input 1 or 2 via XLR or
6.3mm jack

Connect any line level signal (e.g. MP3 player or CD player) or mixer output to the line input either via XLR or twin
RCA lead.

If the combined input signal is to continue to further active speakers, connect these from the LINE OUT from either
the XLR connector or 6.3mm jack.

BASS and TREBLE controls should remain pointing vertically (12-o-clock position).

With all 3 input LEVEL controls turned fully down, press the power switch on and turn the master LEVEL control up
gradually to half way

For each input, gradually turn up the LEVEL control until the required volume is achieved.

Adjust the master LEVEL control to accommodate the overall required output volume and boost or cut TREBLE and
BASS controls as required.

If the CLIP LED is flashing regularly, turn down either input or master LEVEL controls until it stops

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.

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 LEVEL, TREBLE and BASS controls.

Before switching the QS active speaker off, turn down the master LEVEL 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

Power supply
Main driver
HF Unit
HF Dispersion
Output power (max)
Output power (RMS)
Frequency Response (-3dB)
Frequency Response (-10dB)
Input Sensitivity
Crossover Frequency
SPL @ 1W/1m
T.H.D.
Dimensions
Weight

Troubleshooting

No output and no LEDs lit
Power LED lit but no sound from external
inputs
Distorted output
Microphone output very low
QS12A
30cm (12")
2.5cm (1") titanium comp. driver
500W
250W
55Hz - 18kHz
50Hz - 20kHz
96dB
595 x 420 x 320mm
19.5kg
Check POWER switch is on
Check mains lead is connected and fuse hasn't blown
Check leads are OK and connected properly
Check master and input LEVEL controls are not fully down
Check that line level signal is not connected to a MIC input
Reduce LEVEL control on the relevant channel until signal is clean
Check that microphone is not connected to the line input
© QTX Sound 2011
230Vac 50Hz (IEC)
38cm (15")
3.5cm (1.38") titanium comp. driver
105° x 55°
50Hz - 18kHz
45Hz - 20kHz
1V (p-p)
3kHz
<3%
690 x 460 x 400mm
QS15A
700W
350W
99dB
26.5kg