qtx QX12A Active Speaker Cabinets User Manual
- June 6, 2024
- qtx
Table of Contents
qtx QX12A Active Speaker Cabinets
Introduction
Thank you for choosing this QXA series active speaker cabinet, which has been designed to offer flexible and reliable service for a wide range of sound reinforcement applications. Please read this manual to get the best results from this product and avoid damage through misuse.
Package Contents
Please check the contents to ensure that the product has been received in good condition.
- QX series active speaker
- IEC mains power lead(s)
If you find any accessory is missing or the product has arrived with any problems, please contact your retailer at once. This product contains no user- serviceable parts so make no attempt to try to fix or modify this item yourself as this will invalidate the warranty. We recommend you keep the original package and proof of purchase for any possible replacement or returned demand.
Warning
To prevent the risk of fire or electric shock, do not expose this appliance to
rain or moisture and avoid ingress of water into the enclosure. 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. 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.
Place the unit in an upright position during use and storage.
Keep the unit away from moisture or dusty environments.
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.
BUTTONS
- MIC/LINE – Ch.1 input sensitivity switch & LED
- CH1 INPUT BAL – Ch.1 XLR or 6.3mm input
- GAIN – Gain control for Ch.1 input
- BASS – Bass EQ control for Ch.1 input
- TREBLE – Treble EQ control for Ch.1 input
- ECHO – Echo effect level control for Ch.1
- OUTPUT BAL – XLR signal output Ch.1 + Ch.2
- MASTER VOLUME – Master output control
- POWER – Mains power switch and LED
- MAINS INLET – IEC inlet & fuse holder
- CH2 INPUT – Twin RCA line input (summed)
- GAIN – Gain control for Ch.2 input
- BASS – Bass EQ control for Ch.2 input
- TREBLE – Treble EQ control for Ch.2 input
Setup & 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 QX active speaker,
connect it to Channel 1 via XLR or 6.3mm jack and select “MIC” on the
sensitivity switch (1). Alternatively, a line level signal may be connected to
Channel 1 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 CH1+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 (12-o-clock position).
Press the power switch on and, if the input is connected to Channel 1, turn the Channel 1 GAIN control up gradually. Whilst turning up the Channel 1 GAIN control, make sure the line or mic signal is being fed into the Channel 1 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 1 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 1 also 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.
Specifications
| Model | QX12A | QX15A |
|---|---|---|
| Power supply | 220-240Vac 50/60Hz | |
| Main driver | 300mm (12”) 4Ω | 380mm (15”) 4Ω |
| HF unit | 38mm (1.5”) Ti comp driver | 50mm (2”) Ti comp driver |
| Output power RMS | 200W | 250W |
| Output power Max | 400W | 500W |
| SNR | 87dB | |
| THD | 0.1% | |
| Dispersion | 90° x 60° (H x V) | |
| Frequency response | 45Hz – 20kHz | 40Hz – 20kHz |
| Max SPL | 127dB | 129dB |
| Dimensions | 345 x 565 x 320mm | 420 x 675 x 370mm |
| Weight | 13.2kg | 17.8kg |
Troubleshooting
No output and no LEDs lit
| Check POWER switch is on
---|---
Check mains lead is connected
Check mains fuse hasn’t blown
Power LED lit but no
sound from external inputs
| Che
Check volume and on/off switch on external mic or line sourceCheck VOLUME
controls are not fully down
ck leads are OK and connected properly
Read User Manual Online (PDF format)
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