QT18SA - Subwoofer Qtx - Free user manual and instructions
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| Product Type | Active Subwoofer |
| Brand | Qtx |
| Model | QT18SA |
| Driver Size | 18 inches (457 mm) |
| Type | Active (built-in amplifier) |
| Amplifier Power (RMS) | 1000 W |
| Amplifier Power (Peak) | 2000 W |
| Frequency Response | 30 Hz - 150 Hz |
| Maximum SPL | 130 dB |
| Impedance | 4 ohms |
| Dimensions (W x D x H) | 600 mm x 550 mm x 700 mm |
| Weight | 45 kg |
| Power Supply | AC 110-240 V, 50/60 Hz |
| Input Connections | XLR (balanced), 6.3 mm jack (unbalanced) |
| Output Connections | XLR Link Output |
| Cooling | Active fan cooling |
| Protection | Short-circuit, thermal, overload |
| Enclosure Type | Bass-reflex (ported) |
| Finish | Black textured paint |
| Features | Adjustable crossover, phase switch, volume control |
| Safety | Use grounded outlet; do not expose to moisture; operate in well-ventilated area. |
| Maintenance | Clean with dry cloth; check cables periodically; ensure ventilation slots are unobstructed. |
| Spare Parts & Repairability | Replaceable fuse; driver replacement available; amplifier module serviceable by qualified technician. |
Frequently Asked Questions - QT18SA Qtx
How do I connect the QT18SA subwoofer to my mixer?
Use a balanced XLR cable from the mixer's main output to the subwoofer's input. If using two subwoofers, connect the first sub's XLR link output to the second sub's input.
What is the power rating of the QT18SA?
The QT18SA has a built-in amplifier rated at 1000 W RMS and 2000 W peak.
Can the QT18SA be used outdoors?
It is not weatherproof. Use under cover or with a suitable protective enclosure if used outdoors. Avoid rain and direct sunlight.
How do I set the crossover frequency?
Use the crossover knob on the rear panel. A typical setting for full-range speakers is around 80-120 Hz. Adjust based on your speaker specifications.
What should I do if there is no sound from the subwoofer?
Check power, audio cables, and volume levels. Ensure the subwoofer's on/off switch is on. Verify that the input signal is present and the phase switch is set correctly.
How do I transport the QT18SA safely?
Use a wheeled flight case or robust transportation with padding. Secure the subwoofer to prevent shifting during transport.
Can I daisy-chain multiple QT18SA subwoofers?
Yes, use the XLR link output to connect to the next subwoofer's input. Ensure the total load impedance stays within amplifier limits (usually 4 ohms per channel).
What is the phase switch for?
The phase switch (0° or 180°) aligns the subwoofer's output with the main speakers. Switch between settings to achieve the strongest bass response at the listening position.
How do I clean and maintain the QT18SA?
Wipe the exterior with a soft dry cloth. Do not use chemicals. Periodically check the power cable and input connectors for damage. Keep ventilation grilles free of dust.
Where can I find replacement parts for the QT18SA?
Contact Qtx customer support or authorized dealers for replacement drivers, fuses, or amplifier modules. Use only genuine parts to maintain performance and safety.
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