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QSC K12 12" Powered PA Speaker

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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).... Read More

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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.

  • 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
  • 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.

Pro Coverage gives you added warranty protection for your new gear. Stepping in where the manufacturer's "normal wear and tear" coverage ends, our Pro Coverage program offers you upgraded coverage if your product ever fails Read More.

Pro Coverage includes
  • Accidental damage protection (new gear only)
  • Expedited repair
  • Free shipping (for returns or repairs)
  • 100% coverage for commercial use
  • Extended return period
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  • No lemon guarantee
  • Free transfer of coverage to a new owner
  • Repair costs covered for up to three years from date of purchase
  • Repair authorization-toll-free by phone or via the web
  • Customer Reviews


by PowerReviews

(based on 49 reviews)

Ratings Distribution

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Most Liked Positive Review


Thank You QSC

I would love to write a full review on this produc, however they have placed a limit on length. Few times in my life have I ever purchased a product that exceeded my...Read complete review

I would love to write a full review on this produc, however they have placed a limit on length. Few times in my life have I ever purchased a product that exceeded my expectation. This product is lightweight, (Easy onb the back), and produces huge sound !!! The best part is, it behaves more like some sort of studion reference monitor than a PA Speaker. The tones are exceptionally smoothe. I found that there was no longer a need for some of my signal processing between mixer and speaker, (Such as sub harmonic synthesizes and graphics). Also I was impressed that the fans weren't obknoxiously loud. I also really was blown away by the (Deep) circuit when activated. Really brings the low end to life if your listening to them at lower volume. Buy with confidence, you will really like this one !!!!!!!!!


Most Liked Negative Review


Boomy bass, nasal vocals

There is lots of bass, but it is boomy rather than tight--probably mostly because of the small cabinet. To my ears, the vocals were quite nasally. I ended up getting Yamaha...Read complete review

There is lots of bass, but it is boomy rather than tight--probably mostly because of the small cabinet. To my ears, the vocals were quite nasally. I ended up getting Yamaha DSR115 speakers which had much tighter bass and much more natural-sounding vocals

Reviewed by 49 customers

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3 shows down, countless more to go!

By Daniel

from Seattle, WA

I wanted these speakers from the moment I first set my eyes on them and heard them in my local Guitar Center. One week ago I finally pulled the trigger and bought two of these lovelies! The first gig I did only had enough room to accommodate one of them as we were in tight quarters. I was impressed with the sound of the one. I really had to work at getting the sound mixed in order to get it to my satisfaction, but halfway through the gig I figured it out. The second and third gig I did took the cake. I used both of these for the first time ever together and it felt like I had my own personal sound man in the best opera house in the world. It was magical and took very little tweaking on my Mackie FX8. I plan on keeping these speakers forever. I'm still teetor tottering on the extended warranty. I may purchase it, but I may not. I have the two totes and love them and have never had issues with my sound equipment. Thoughts?

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Second Review on QSC K12 and gigbag

By Terry

from Salem, Oregon

January was 2 years since purchased. This product was worth every cent. The amount of gigs and lessons that this speaker has been through has been in the hundreds in the last 2 1/2 years and everyone that hears it comments. Go ahead and do it, splurge, borrow the extra bucks, do what ever it takes and take one or two of these home. You will be pleased with the versatility and convenience. The gig bag is expensive also,... but it has shown so little wear and it has been in some rough terrain but still protected the finish well. The zipper is smooth and appears to be rugged. There is little padding in the lining but the material is strong. After my last cabin weekend in the mountains and my lap top sitting atop my speaker, we had instant dance floor on the patio with the aid of a couple spinning lights. Low volume this time because we are all old but the DEEP selection reminds me of the old style LOUDNESS button filling up the outside air. Came home so impressed again that I had to write the second review. Go see why I bought it in the first place and then realize I have used it so many different ways than I originally intended. With the built in mixer I have piggy backed off a monitor mix and still used it as my personal amp. 1 speaker doing monitor mix and my own personal amp simulator mix. Around a camp fire fueling electric drums, electric bass, and electric keys while I accompanied on acoustic guitar, using the RCA input for the lap top to play the break music. I could go on for days. oh, and it gets loud when it has to, get one.....

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Beast......Men amongst boyz


from Jackson, MS

This baby is the TRUTH....if you can afford it get it......AWESOME.....crowd pleaser & game changer.....paired it the QSC KW 181 and had the entire building grooving....GAME OVER.....

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Hard to beat

By Stephen Brown

from Greenville, SC

I own and operate a DJ company in Greenville, SC http://theweddingdj.net and we use the QSC k-12 almost every week. I have owned huge speakers that did not put out half the sound these things do without any distortion. What are you waiting for click on add to cart. They are worth every dime and then some.

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Pros and Cons of the K12

By Eddie Faggioli

from Palm Beach Gardens

When I turned them on in my living room I couldn't hear the difference in DEEP mode. I played in a small/medium sized banquet room. I had them maxed out and I see how the KW series was made available for bigger rooms. In the banquet room I could tell a huge difference in the DEEP mode. Apparently, the DEEP frequency seemed to be the resonant frequency of the room, which made the bass very loud for a 12" mid driver. They are also light to carry. I would recommend these AMAZING sounding speakers to anyone, but for bigger applications the KW series becomes more essential. Consider the size of the rooms and the portability of the speakers when purchasing. I was also impressed how cool they were after 4 hours of full volume performance.

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Can't go wrong with QSC - K12's are "BEST IN CLASS"

By Guy Steagall

from Denver, CO

Sometimes you simply get what you pay for... The K12's absolutely ROCK. Easy to set up and operate, light weight, best customer service around (if you text, e-mail or call, someone always responds!), and overall - the speakers sound amazing. I have used them with full bands, duos, and for single work. In the deep mode - they actually do a pretty decent job with drums and bass. I got tired of buying cheaper brands that did not sound as good, but worse - kept breaking after regular use. The K12's are built to last, can take a beating and have plenty of clean power to handle many types of gigs. Simply stated, these are the BEST PA speakers I have ever owned. I plan to supplement these with KSUBs in the very near future!

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Best Powered Speaker on the Market for its Size!!!

By Steve Schneider

from Oxford, CT

Being a mobile DJ for 26 years and having used several sets of passive speakers in that time, I wanted to make sure I did my ?homework? before I made the leap into powered speakers. My criteria for the powered speakers was that they: - needed to be under 45 lbs. - have enough power to do a mid-to-large event - sound good when cranked up - have the features I needed (flexible inputs, daisy chaining, etc.). - have a good reputation (quality and warranty) After compiling a list of prospective models, I took a weekend and listened to the models side-by-side (luckily, my local Guitar Center had just about all of them on display for me to test). For each speaker comparison, I: - set all EQ to flat in the source, mixer, and on the speaker itself. - made sure the level was compensated so that the loudness (DB output) to my ears would be the same when I switched between the speakers. - positioned myself in the same position and distance from each speaker - played the same source material in each (and varied the source material as necessary to get a balanced feel for what the speaker could do). - played the speakers at varying volume levels I tried all the top brands and models: Mackie SRM450v2, EV (SXA100+, EV ELX112P), JBL (EON515XT, PRX612M), Yamaha (MS400, DXR12), Behringer (VP1220D, B112D, B912Neo), QSC K12, and Peavey Impulse 12D. During the testing, for any two given speakers, I would pick a ?better sounding? speaker and use that speaker in my next comparison. After I reached the QSC K12 in my testing, I liked the sound so much that I used that as my ?reference? speaker from that point on and went back and compared it against all of the speakers I was testing. It was after this extensive exercise that I determined that the QSC K12, hands down, was the winner (it was also the most expensive, but I wanted to find the best). The reasons I chose the QSC K12: - The sound was the most balanced and natural sounding of any PA speaker I have heard (powered or not). At mid-to-high volumes, most Pro sound speakers have a tendency to overemphasize the high-end and upper midrange frequencies, which are the precisely the ones that cause ?ear fatigue? when you are exposed to them for any length of time. On the K12s, you can particularly note the difference when playing Jazz and Big Band music (for example, Frank Sinatra?s vocals had more of a ?megaphone/honky? quality to it on the other speakers). - The bass was clean and tight, especially when enabling the ?deep? switch setting on back. No other speakers (with the exception of the Yamaha MS400) could match its bass response at any volume in this mode. - it was made in the USA and backed up with a 6 year warranty A few weeks after I bought the K12s, I decided to put them to a test at my next DJ event (a mid-size wedding of 175 people) that was held in a converted airplane hangar. As you can imagine, the environment was not well-suited for acoustics (30 foot ceilings, cement floor, glass on the entire back wall). However, these speakers turned out to be ideal in such a ?live? environment. Because of their natural sound, they did not generate the ?ear fatigue? that would normally occur with other speakers in this setting. They were also slightly less prone to feedback than what I am used to. Needless to say, I would highly recommend these speakers to anyone who wants the most natural sound from a ?turnkey? sound system (i.e., one where you don?t have to contend with separate speakers, amps, equalizers, phase correction, etc.).

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QSC K-12

By john roesli

from Chula Vista California

These are great all around work horses. Enough power and dynamic range for a variety of small gigs and work just as well for floor wedges on medium size gigs. So far very dependable. All in all for this price range a great sounding speaker. I have compared them to a number of other speakers in this size and price range and they still always come out on top.

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Awesome Speaker!

By Robert Chan

from New York

I've owned this speaker for well over a year, and have used it for various private events both indoor and outdoor. The bass on this product is outstanding and the quality of the sound is the best I've heard. One of these speakers is definitely loud enough for a small to medium sized event. I use this with the Rane TTM 57 mixer, and would say that at 30 to 40% volume, the speaker is loud enough for a typical sweet sixteen event housing well over 50 people. My only wish would be for the product to be a little lighter!

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New Industry Standard 12"

By Justin Goodman

from Arlington, VA

I own about a dozen of these and use them all the time both personally as a DJ and rent them to customers as well. I'll keep it short and sweet: Pros: --Great sound quality --Good volume --Rock Solid 6 year warranty --Reliable and durable Cons: --Need subs for higher SPL applications. Limit light comes on a bit quickly when playing full range sound. At the end of the day you can't find a better 12" speaker at this price point, period. It's much better than the JBL PRX, Yahama, Mackie etc. Justin Goodman JG Entertainment Washington, DC

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