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QSC Audio
QSC KLA181 18" Active Line Array Subwoofer
Live Subwoofer For Live PA Use
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Want to Click and Collect or try items at our Guildford Store?
The store is open 10am - 6pm Monday to Saturday and 11am - 5pm Sunday and bank holidays.
The stock information shows the quantity of units that are available to purchase at the Guildford store and the quantity of units that are available at our off-site Guildford warehouse. These stock levels are updated in real time.
Our Click and Collect service is available at our Guildford store from 10am - 6pm Monday to Saturday, and 11am - 5pm on Sunday. You can either choose click and collect as your delivery option online or, during store opening hours, call our sales team at 01483 456777 to place a 10% deposit.
If you have placed your order online, you will receive a confirmation email of your order and a separate follow-up text or email to confirm when your item is ready for collection.
Please do not come to the store before you have received the follow-up message, as your order may not yet be ready at the store.
If the only available stock is in our off-site warehouse it can be brought to the store location for you to try - you just need to contact the store within opening hours. Please note any requests received after 3.30pm will not arrive at the store until the following morning.
Please be aware that, unless you have paid a deposit to reserve the item, it will continue to be free, both online and in-store, for another customer to buy. Therefore we would advise you to place a 10% deposit by either using the on-line click and collect service or calling us 01483 456777.
SKU: QSCKLA181
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Product Description
The QSC KLA181 18-inch Active PA Subwoofer delivers exceptional low-end power, making it the perfect addition to professional venues and live events. Equipped with an 18-inch vented woofer, it produces clear, deep bass that reaches down to 33 Hz, while offering a peak acoustic output of 135 dB SPL. Designed to operate as a standalone subwoofer or in combination with the KLA12, the KLA181 allows flexible array configurations for wider coverage in larger venues or suspended setups for arenas and outdoor festivals. Its advanced DSP, including the QSC DEEP algorithm, extends bass response and prevents distortion, while GuardRail protection safeguards against thermal overload and clipping. The speaker also features Auto Standby, reducing power consumption after periods of inactivity. With robust birch plywood construction and a textured paint finish, the KLA181 is built to withstand the rigours of professional use without compromising portability. Whether for concerts, festivals, or large-scale events, this subwoofer ensures articulate, powerful low-end sound, making every performance unforgettable.
Features
- Powerful 18 Inch Subwoofer:
Delivers deep, clear bass with a peak output of 135 dB SPL, capable of reaching frequencies down to 33 Hz for professional low-end performance. - Advanced DSP and Protection:
Features QSC DEEP algorithm, GuardRail circuitry, and thermal protection to optimise sound and safeguard the system from overload or distortion. - Durable and Flexible Construction:
Rugged birch plywood enclosure with textured paint, M10 fittings and pole receptacle allows versatile placement and long-lasting reliability.
Massive Sound Reinforcement:
The KLA181 is engineered to provide huge sound for large venues, ensuring every audience member experiences powerful, crystal clear bass. Its 1000-watt Class D amplifier drives the 18-inch woofer with precision, delivering full-bodied low frequencies that remain articulate even at high SPL levels. The extended frequency response allows the subwoofer to reproduce the lowest notes accurately, while integrated DSP ensures consistent performance without distortion. Whether used alone or in arrays with KLA12 speakers, the KLA181 enhances live performances, festivals, and club environments with impactful, controlled bass that fills every corner of the room.
Rugged and Reliable Design:
Constructed from high-quality birch plywood and finished with durable textured paint, the KLA181 is built to withstand the demands of touring and professional installations. Its robust design protects the speaker from everyday wear while keeping the weight manageable for easy handling. Equipped with M10 suspension points, a threaded pole receptacle, and optional KLA12 array frame compatibility, the subwoofer offers flexible mounting options. Whether freestanding or flown, it maintains consistent performance, making it a dependable choice for venues of all sizes.
Optimised Performance with DSP:
The KLA181 incorporates sophisticated digital signal processing, including the QSC DEEP algorithm, to extend low-frequency response while managing transient peaks. GuardRail protection prevents thermal and overcurrent issues, while Auto Standby conserves power during inactivity. This combination of intelligent processing and protection ensures maximum efficiency, longevity, and reliable performance under demanding conditions, allowing sound engineers to achieve professional, high-impact audio with ease and confidence.
Specifications
- Configuration: 18-inch subwoofer
- Transducers: 18-inch cone transducer
- Frequency Response (-6 dB): 38 Hz
- Frequency Range (-10 dB): 33 Hz
- Maximum SPL (1 metre): 135 dB peak
- Power Output: 1000 W Class D continuous
- Input Impedance XLR: 40 kΩ balanced / 20 kΩ unbalanced
- Controls: Power, Attenuation, LF Mode (Normal/DEEP™), Polarity (Normal/Reverse), Front LED (Pwr/Limit/Off)
- Indicators: Power, Signal, Standby, Limit
- Connectors: Balanced female XLR line level input, Balanced male XLR full range line level out, Remote attenuation control, Locking powerCON AC In, Locking powerCON AC Out
- Cooling: On demand, 50 mm variable speed fan
- Amplifier Protection: Thermal limiting, output overcurrent, overtemperature muting, GuardRail™
- Transducer Protection: Thermal limiting, excursion limiting
- AC Power Input: Universal 100–240 VAC, 50 to 60 Hz
- Material: Painted birch plywood
- Finish: Black or white textured paint
- Grille: Black or white powder-coated 16-gauge steel
- Dimensions (H x W x D): 547 x 586 x 633 mm / 21.6 × 23.1 × 25.7 inches
- Net Weight: 45.3 kg / 100 lb
