Used QSC K Series loudspeakers represent a widely adopted standard in lightweight powered speaker systems, combining 1000-watt Class D amplification with extensive DSP across the K8, K10 and K12 full-range models. Developed under Pat Quilter, the range is built for both live and installed applications. Browse the second-hand QSC K Series listings available below to find the model that suits your setup.
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QSC K Series specifications
| Brand | QSC |
| Segment | Audio |
About the QSC K Series
The QSC K Series is a family of powered loudspeakers built around 1000-watt continuous Class D power modules and extensive digital signal processing, delivering sonic clarity and output that belie the systems' size and weight. All full-range models share an identical 1.75-inch high-frequency compression driver. The K8 offers a 105-degree conical DMT coverage pattern and 127 dB peak SPL, the K10 provides 90-degree coverage and 129 dB peak SPL with monitor wedge capability, and the K12 delivers 75-degree coverage and 131 dB peak SPL. Rugged ABS enclosures with 16-gauge powder-coated steel grilles, ergonomic handles, 35 mm pole sockets with Tilt-Direct, and M10 rigging points support a wide range of live and installed applications.
QSC K Series — buyer FAQs
What are the differences between the QSC K8, K10 and K12?
The three full-range models share the same 1000-watt continuous Class D amplifier and identical 1.75-inch HF compression driver, but differ in woofer size, coverage pattern and maximum SPL. The K8 uses an 8-inch woofer with 105-degree conical DMT coverage and 127 dB peak SPL. The K10 steps up to a 10-inch woofer, 90-degree coverage and 129 dB peak, and also functions as a monitor wedge. The K12 offers a 12-inch woofer, 75-degree coverage and 131 dB peak SPL.
Who makes the QSC K Series and where does it fit in the QSC range?
The K Series is made by QSC, an American audio, video and control manufacturer founded in 1968 and headquartered in Costa Mesa, California, known across professional audio for power amplifiers, loudspeakers and the Q-SYS platform. The K Series sits within QSC's powered loudspeaker line as a lightweight, self-powered system aimed at both live and installed applications, developed under the direction of Pat Quilter.
What mounting and rigging options does the QSC K Series support?
All K Series models include 35 mm pole sockets with Tilt-Direct for angled pole mounting, M10 rigging points, and ergonomic handles for easy transport. Eyebolt and yoke mount accessories are also available, giving the system a broad set of options for floor, pole, flown and installed deployments across live and fixed installation environments.
What should I check when buying a used QSC K Series loudspeaker?
Check which model is included, as the K8, K10 and K12 differ in woofer size, coverage angle and peak SPL. Inspect the ABS enclosure and steel grille for damage, and confirm the Class D amplifier powers on and the DSP operates correctly. Used prices vary with condition, model and any accessories. Listings on this page show current availability, and every 10K Used purchase includes a 21-day warranty covering major functional faults. The buying guide at 10kused.com/used-av-equipment-guide/ covers the full process.
