Item # 581518 | Customer Ratings: ( 5 Based on 53 reviews)

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QSC K12 12" Powered PA Speaker
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Amazingly powerful output and killer sound in a compact cab.

The QSC K12 is a 12" 2-way PA speaker system boasting a 1,000W Class D power module and ~75° horizontal and vertical coverage. Low frequencies extend to ~48Hz (-10dB high acoustic output, 131dB peak). This low-frequency extension makes the QSC K12 an ideal choice for music playback and live reinforcement of instruments, especially in venues where more directional speakers are needed. Equally at home in the role of stage monitor, the QSC K12 speaker enclosure has an angled side for use as a low-profile, horizontal wedge and a flat side for proper side-fill use.

QSC's K12 PA Speaker features a 1-3/4" HF device in its 2-way enclosure. The primary differentiator in K Series speakers is the resulting output dispersion-the K8 being the widest at 105° and the K12 the narrowest at 75°. This radical approach is achievable due to a process called Directivity Matched Transition (DMT). DMT allows QSC to take advantage of a fundamental law of acoustics: smaller diameter woofers have wider coverage patterns than larger ones. The K Series matches the HF device to the LF dispersion, allowing for the smoothest and flattest frequency response possible across the entire sound field.

Add to this advanced DSP processing and an enclosure molded from ABS-a material far more rugged and sonically pleasing than conventional plastics-and the QSC K12 delivers exceptional performance in this category of loudspeakers.

Several proprietary QSC DSP technologies are incorporated into the K Series. One such technology is Digital Extension and Excursion Processing (DEEP). DEEP allows each of the K Series models to deliver levels of low-frequency extension previously impossible in enclosures of this size. Intrinsic Correction, first featured in QSC line-array technology, use dozens of spatially averaged measurements mapped to the processor to deliver smooth and accurate reproduction across the entire sound field.

Preventing amplifier clipping or overload is QSC's proprietary GuardRail technology. GuardRail closely monitors the input voltage and controls the amplifier output stage before the onset of clipping. Unlike typical clip limiters, when GuardRail is activated, the results are all but undetectable-there's none of the typical "pumping" associated with other methods. In addition, user EQ controls are provided to select between subwoofer settings (EXTSUB, VOCAL, or FLAT response).

The K12 speaker boasts other user-friendly features. For example, when the speaker is pole-mounted, the Tilt-Direct pole socket converts to a 7.5° down-tilt with a simple 180° rotation of the dial. A locking IEC power cord is included, preventing accidental disconnect during a performance. For installed applications, connecting a commonly available potentiometer to the unit's Euroblock connector allows the operator to have gain control from a remote location. Multiple K Series units can be daisy-chained together to one centralized control. Additionally, the K Series enters Standby mode after 5 minutes of inactivity, conserving power.

The entire QSC K12 package is housed in rugged and sonically friendly ABS (the sub in birch plywood) with steel grilles and easy-carry ergonomic aluminum handles.

Processing, Connectivity & Monitoring

The brain of the system is its expansive digital signal processing. While the DSP functions are optimized using Intrinsic Correction, DEEP, DMT, and GuardRail technologies (with the high-pass filter included for use with subwoofer systems), two XLR-combi inputs, each with its own Level control, are provided. Both accommodate line-level inputs and one may be switched to microphone level sensitivity. Phono (RCA) input jacks are also included for connection of consumer electronics sources. Dual XLR outputs are provided for dual "loop-thru" XLR/M connectors and a single XLR jack is available as a summed output. All 3 input sources may be used at once and mixed via the 2 Gain control knobs.

Input Panel LED indicators are provided for Power, Signal Present, Mic Level Sensitivity, and Limit annunciation. A front-mounted power LED may be disabled by means of a
rear-panel switch when desired or set so it indicates when the limit circuitry has been engaged.


Each K model incorporates a conical waveguide that maintains pattern control all the way down to the crossover frequency. The coverage angles of the waveguides are tailored for a smooth transition from woofer to compression driver with far less "waistbanding" or other directivity related anomalies than other products in this class.

Suspension and Mounting

The K12 2-way PA speaker may be pole-mounted, suspended, or yoke-mounted. The K12 yoke accessory kit (not included) allows for either horizontal or vertical yoke mounting, providing a flexible means of attaching K Series loudspeakers to a building structure or truss. When suspended deployment is required, M10 threaded inserts support vertical or horizontal suspension, while the integral polemount socket accommodates 35mm speaker poles for use on a speaker stand or over a sub. The pole socket is designed so that the speaker may be angled down 7.5° in order to cover the audience while keeping acoustic energy off reflective walls and ceilings.

QSC K12 12" Powered PA Speaker Features:

  • 1,000 watt, efficient and lightweight Class D power module
    Lightweight (41 lb.)
    Professional appearance and rugged construction
    Directivity Matched Transition (DMT) and Intrinsic Correction DSP tuning for accurate, undistorted performance across the entire sound field
    GuardRail technology discreetly protects the system from damaging overload
    DEEP mode for enhanced low-frequency extension without a subwoofer
    Locking IEC power cable
    XLR and 1/4" connectors
    Phone mic/line and line inputs with loop-thru connectors and independent level controls.
    Phono (RCA) inputs
    Three 2-way models—each with coverage pattern optimized to match the LF driver
    Front mounted LED may be switched off or indicate "LIMIT" or AC Power On
    Dual-angle, 35mm pole socket with Tilt-Direct allows the speaker to be angled down to put the energy on the audience instead of the back wall
    1-3/4" voice-coil compression driver
    High-pass filter for use with subwoofers

QSC K12 12" Powered PA Speaker Specifications:

  • Amplifier power: 1,000W Class D
    Transducers: 12" LF, 1-3/4" HF
    Coverage Pattern: 75° conical
    Frequency Response: 48Hz-20kHz
    Max SPL: 131dB
    Operating Voltage: 85-275 VAC @ 50-60Hz
    Unit Dimensions: 14" W x 23-7/10" H x 14" D
    Weight: 41 lb.

Product Reviews
(Based on 53 reviews)
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  • QSC has out done themselves

    As reviewed by Jake Gordon on 11/1/2011

    The QSC k12 is part of a series of powered loudspeakers released by QSC. The k series contains three different speakers models as well as a subwoofer. The speaker model varies by the internal subwoofer size, the k8 containing an 8? woofer, the k10 containing a 10? woofer, and the k12 containing a 12? woofer. Regardless of the different sizes each speaker puts out 1000 watts of class D sound and 2000 watts peak. The 1000 watts is run through a compressor and is evenly distributed between the subwoofer and the tweeter. I have owned a pair of k12?s for a year now and I can honestly say that they are the best speaker I have ever used. At only 55 pounds and an output of 1000 watts, ?outstanding? is an understatement. I use these speakers for all of my DJ gigs and at each one I am complimented on their sound quality, even when peaking 1000 watts they are still undistorted and crystal clear. I would recommend the QSC k12?s to any wedding or club DJ who is working within a large venue. Their sound quality carries throughout a large number of venue types.

    4 of 4 people found this review helpful.
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    As reviewed by greg atkins on 12/12/2012

    Well I am a media pastor in AL and we just put in a new sound system we have the K12 as front of house 4 of them up top and K10 for floor monitors! they are of corse run with a sub which give you a lot more from this speaker! presonus 24 board really makes these K12s sound great! started noticing that we were only getting highs out of 2 so I called QSC they overnighted me boxes and overnighted them back to me no cost covered fro 6 years is what they said! thanks QSC we have large and small churches come and sit and chat ask about our sound all the time when we have an event people are always like man that one of the best I have heard!!!!!

    3 of 3 people found this review helpful.
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  • Great sound but not quite the power

    As reviewed by Paul Stibal on 10/25/2011

    Okay, I think everyone knows how good these speakers sound at this point. I have been using them for a couple years for shows inside and out; with or without different subs. I would never complain about the sound of them but there have been many times I really could have used a bit more juice. Other reviews have said the same. So, I just wanted to find some real numbers to let people know what they are truly getting out of these speakers. On QSC's documentation they say that you can get 131 dB. This number is, as they say on their site, theoretical calculations. I put my dB meter in front of this speaker at 3 ft or almost 1 meter and ran some pink noise to the point the limiter kicked in. The dB meter read 116.6. The speaker was standing upright on the floor so even that number is a bit generous. By comparison, I did the exact same test with one of my Behringer B212d which I use for monitors and got 113.0 when it started hitting red. I am not at all comparing sound between the speakers I was just using it for power/volume comparison. I realize that the limiter kicked in and there may still be some headroom but I can't believe enough to pull another 10 or more dB. Have I ever regretted buying them no but I am currently looking for something else for bigger shows next summer.

    3 of 3 people found this review helpful.
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Westlake Village, CA 91359
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