qtx QT-Series Active Sub Cabinets User Manual
- June 6, 2024
- qtx
Table of Contents
qtx QT-Series Active Sub Cabinets
Introduction
Thank you for choosing a QT-series active subwoofer as part of your sound system. This unit is designed to offer powerful sub frequencies for PA systems in leisure and entertainment applications.
Package Contents
Please check the contents to ensure that the product has been received in good condition with the appropriate mains lead(s). If you find that the product has arrived with any problems, please contact your retailer at once.
Warning
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. 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.
Prior to connecting mains, check the supply voltage is correct and the mains
lead is OK.
Avoid ingress of water or particles into the enclosure.
If the mains fuse blows continually, 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.
- Avoid locations where liquids may be spilled onto the unit.
- Ensure that any supporting structures have adequate load capacity for the weight of the unit. Ensure adequate space for cooling to the rear panel and easy access for controls and connections.
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.
- INPUT LEVEL control
- Line level INPUTXLR
- Phase switch
- Line output THRUXLR
- FREQUENCYcontrol
- Power ON/OFFswitch
- IEC mains powerinlet
Setup & Operation
- With INPUT LEVEL turned fully down and power switch off, connect the IEC to an appropriate mains outlet.
- Connect output of mixer or any line level signal to the INPUT via XLR. If the signal is to continue to further active speakers, connect these from the THRU line level XLR.
- Begin with the FREQUENCY control in the mid position (12-o-clock position)
- Press the power switch on and gradually increase the INPUT LEVEL until the bass signal is heard through the speaker.
- Turning the FREQUENCY control up will include more mid frequencies and turning it down will eliminate all but the lowest frequencies. Adjust the
- FREQUENCY control to the desired tone, noting that lower settings may need the INPUT LEVEL turning up to compensate for the narrower frequency band.
- The PHASE switch can help eliminate speakers which are “out-of-phase” from cancelling each other’s signals out. The correct setting for this switch is whichever setting gives the loudest output – by a process of trial and error. One or other setting may also help to avoid feedback. If there is no difference in volume or feedback, leave the switch in the “0°” position (out)
- To avoid loud noises when powering down, turn down the OUTPUT LEVEL before switching off.
Specifications
| Model | QT15SA | QT18SA |
|---|---|---|
| Power supply | 220-240Vac 50/60Hz (IEC) | |
| Cutoff Frequency | 40 – 150Hz | |
| Connections | XLR line in, XLR line out | |
| Main driver | 38cm (15”) 8Ω | 45cm (18”) 8Ω |
| Output handling (max) | 600W | 1000W |
| Dimensions | 515 x 420 x 615mm | 585 x 475 x 675mm |
| Weight | 22kg | 29kg |
Troubleshooting
| No output and no LEDs lit | Check POWER switch is on |
|---|
Check mains lead is connected properly and fuse hasn’t blown
Power LED lit but no sound from external inputs
| Check signal leads are OK and connected properly
Try turning up the FREQUENCY control
Ensure input signal has some bass content for the sub to produce
Check INPUT LEVEL control is not fully down
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