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QSC K-8 Active PA Speaker

The K8 is a professional active PA speaker with 8" driver and 1000w of RMS power.

Key Features:

  • 1000w RMS
  • D-Class Amplifier
  • Wide dispersion angle
  • Flexible input section
  • Locking power input socket
  • 8" Driver
  • 3 + 3 year warranty

6 year warranty

    view all QSC products

    Product Code: 400020900

    Want delivery on Wed 18th of Oct? Order in the next and select Next Day Delivery.

    Availability: In Stock

    • £505 EACH
    • £999 PAIR

    The QSC K 8 is quite simply the new standard in lightweight powered loudspeaker systems.

    QSC's team of amplifier engineers have created a new standard in Class D power modules unparalleled in the industry. Next, breaking from the traditional loudspeaker paradigm, every model is fitted with the identical 1.75 HF device (fullrange models) and woofers of the same high quality for unparalleled performance, regardless of speaker size.Extensive DSP processing is employed throughout, providing levels of sonic clarity and total output that defy the system's size and weight.Premium-grade materials, advanced construction processes and multiple mounting and suspension options allow for a wide range of live and installed applications.

    Combo XLR and 1/4 TRS inputs accept both Mic and Line Level input while a set of RCA phono inputs (except KSub) allow additional connectivity to portable MP3 players, CD players and line-level mixers. Up to three audio sources can be mixed internally and summed to a balanced output for daisy-chaining of multiple units. Separate direct outputs are also provided on each channel for additional output flexibility.On-board switches provide preset EQ settings.

    The HF setting (fullrange models) can be set to VOCAL BOOST for additional presence in the critical mid-frequency area or FLAT for accurate reproduction of the incoming signal. The LF switch can be set to NORM, DEEP

    SPECIFICATIONSK8
    Configuration Trapezoidal 2-way
    Transducers

    Low-frequency

    High-frequency


    8" cone transducer

    1.75" diaphragm compression driver
    Frequency Response (-6 dB) 66 Hz - 18 kHz
    Frequency Range (-10 dB) 61 Hz - 20 kHz
    Nominal Coverage (-6 dB) 105° conical
    Maximum SPL (1 meter) 127 dB peak
    Amplifiers
    Power Output 1000 W Class D

    (500 W LF, 500 W HF)
    Input Impedance (ohms) XLR / ¼": 40k balanced / 20k unbalanced

    XLR / ¼" MIC mode: 2260 balanced

    RCA: 10k
    Controls Power, Gain A, Gain B, Mic/Line, LF Mode (Ext Sub/Norm/DEEP™), HF Mode (Flat/Vocal Boost), Front LED (On/Off/Limit)
    Indicators Power, Signal A, Signal B, Standby, Limit, Mic
    Connectors Balanced female XLR/¼" line/mic level input, Balanced female XLR/¼" line level input, Dual Balanced male XLR full range line level out , Balanced male XLR "mix" out, Stereo RCA line level input, Remote gain control, Locking IEC power connector
    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 power supply 85 - 265 VAC, 50 - 60 Hz
    AC Power Consumption

    (1/8 Power)
    100 VAC, 2.3 A

    120 VAC, 2.01 A

    230 VAC, 1.13 A
    Enclosure
    Material Impact resistant ABS
    Finish Black paint
    Grille Black powder coated 18 gauge steel
    Weight (Net) 27 lb / 12.2 kg
    Available Accessories K8 TOTE, K8 YOKE, K SERIES M10 KIT
    Dimensions 17.7" × 11" × 10.6"
    450 mm × 280 mm × 269 mm

    Features

        Lightweight portable powered speakers with legendary QSC amplifier power and reliability

          • 1000 watt Class D power modules in all models
          • Extensive DSP enhances system performance
          • Attractive and professional appearance
          • Rugged ABS enclosures
          • Tour-grade 18 gauge steel grilles
          • Ergonomic handles with comfortable, non-slip grip
          • 35 mm pole sockets with Tilt-Direct™ (fullrange models)
          • M10 rigging points for suspended installation (fullrange models)
    Extensive DSP

      • DMT™ (Directivity Matched Transition) provides for matched LF and HF coverage across the entire listening area, eliminating unnatural "dead" or "hot" frequency zones.
      • Intrinsic Correction™, first featured in our high-end line-array products maps 65-75 spacially-averaged measurements to IIR and FIR filters that actively adjust time, frequency and amplitude response to a maximally flat bandpass target. The result is a speaker that behaves equally well across the entire sound field.
      • DEEP™ and excursion limiting allow for extended low-frequency response by actively managing low-frequency transients without degradation of the underlying signal or adjacent frequencies.
      • GuardRail™ protection, first introduced on our GX Series amplifiers protects both the amplifier module and your performance from unnatural and destructive clipping.

    Directivity

    There is an important relationship between woofer size and waveguide coverage pattern but it is frequently overlooked. It´s known that all woofers have very wide coverage at lower frequencies and narrowing coverage as frequency increases. The smaller the woofer, the wider its coverage will be at a given frequency. However, many speaker designs simply ignore this acoustic principal and pretend that only the high-frequency horn coverage matters. But in reality, a smooth, directional transition from woofer to high-frequency is important in terms of consistent audience coverage and loudspeaker power response.

    K Series is designed using the Directivity Matched Transition (DMT) approach. DMT matches the high-frequency coverage angle to the natural coverage angle of the woofer at the crossover frequency. As a result, frequency response remains far more uniform across the entire audience area.

    The K8 delivers wide 105° coverage making it a great choice for performers who work in more intimate venues where the audience is closer to the stage and spread more widely.

    The more directional K12 with its 75° coverage is a better choice when more "throw" is needed.

    The K10, of course strikes a fine balance between both width and throw. No matter which model you select, you´ll get flat frequency response across the entire coverage area.

    DEEP™

    DEEP (Digital Extension and Excursion Processing) is an exclusive QSC process that allows a K Series loudspeaker to deliver far more undistorted low-frequency output than could be produced by conventional means.

    DEEP begins by applying an equalization boost at low frequency. Certainly many loudspeaker systems do the same thing (there´s nothing new about this). Some even take the next step and apply limiting to reduce the amount of EQ boost as the amplifier approaches overload. The effect may be better than nothing at all, but this process does create audible "pumping" and unnatural high frequency reductions at higher performance volume.

    DEEP employs sophisticated digital signal processing to identify and reduce only those brief, transient low-frequency peaks that can cause woofer over-excursion or amplifier clipping. Reduction of the transient peaks is nearly inaudible and allows the average low-frequency output to remain high. The result is an astonishing amount of low-frequency output, previously impossible to achieve from compact, smaller-format speaker systems.

    1000 Watts

    Loudspeaker manufacturers typically have two separate amplifiers in their powered speakers. Although they share a common power supply, the amplifiers operate very differently and output different power levels. While this approach can make for a streamlined, efficient design, it usually results in a less capable high frequency amp. As a result, the amplifier is easily over-driven if the operator pushes the system hard. The resulting high-frequency distortion is audible and may destroy the compression driver.

    The QSC kilowatt amplifier defines another key difference between K Series and traditional powered speaker systems. All K Series models, regardless of woofer diameter use the same kilowatt power module. Only the input circuitry and DSP programming differ from model to model. No longer does a smaller-format powered loudspeaker have to be equated with lower power and less total performance.

    Energy Management

    When the K Series DSP doesn´t sense input to the amplifier module for 5 minutes, it automatically enters standby mode - effectively shutting down the amplifier, conserving energy and extending the life of the product. Once signal is restored, the processor instantly turns the amplifier back on without any noticeable audio delay. In this manner, the energy-conscious operator is able to conserve resources without taking any additional measures, regardless of the number of K Series loudspeakers in the system.

    Conical Wave Guide

    There are a few basic concepts that guided the design of the K Series waveguides and helped achieve its overall impressive sound quality. First is the understanding that the best, most natural performance in a horn is achieved by avoiding parallel surfaces and abrupt changes in contour. Either will cause phase and acoustical impedance problems that lead to erratic frequency response.

    Second, while a waveguide with a large difference between horizontal and vertical coverage angles may be needed for specific applications, it will necessarily exhibit compromised audio performance. For K Series, the horizontal and vertical coverage angles are identical.

    Finally, the mouth (opening) of the waveguide should be approximately the same diameter as the woofer. In speakers where that isn´t the case, it´s likely that either the crossover frequency is too high or the waveguide isn´t really controlling the pattern all the way down to the crossover frequency. Either of the above will lead to lack of pattern control in the critical mid-range.

    By keeping these concepts in mind, QSC created the large, well-behaved, conical waveguide found on K Series. The sonic benefits, both on and off axis will be clear when you listen for yourself.

    LED Operation

    Located on the front of each K Series loudspealer is a blue LED that´s more than just a simple power indicator. A switch on the rear panel allows the user their choice of three ways to utilize the light.

    In the default (PWR) position, the LED will illuminate and stay on as long as the speaker is powered on. For instances when a bright blue light may not be aesthetically consistent with the venue or the event, moving the switch to the (OFF) position defeats the front LED operation entirely but doesn´t affect the status of the amplifier module. In (LIMIT) mode, the front LED indicates the onset of system limiting, allowing the operator to monitor the well being of the system from in front of the box.

    EQ Modes

    K Series can be used in a wide variety of applications. Users of all types will benefit from the ability to optimize the fullrange models (K8, K10, K12) for a specific application with the simple flip of a switch.

    HF Switch: Because fullrange music and speech reproduction place different demands on a loudspeaker system, the K Series High Frequency (HF) circuitry can be switched to either normal (FLAT) for fullrange, non-equalized music applications or (VOCAL BOOST) whereby frequencies in the vocal range are augmented for increased intelligibility and overall presence.

    LF Switch: K Series Low Frequency behavior is selected by the LF switch. In the default (NORM) position, low frequency response is set for flat music reproduction in stand-alone, full range applications. When pairing any of the K Series models with a subwoofer, the LF switch is set to the (EXT SUB) position, engaging the 100 Hz High Pass Filter for error-free reproduction of frequencies surrounding the crossover point. For users seeking extra low frequency output without a subwoofer, switching to the (DEEP) position engages the proprietary QSC DEEP™ signal processing circuit. Low frequency content is enhanced far beyond what one would typically expect from a compact loudspeaker.

    Remote Control

    A unique, yet highly beneficial function for many users of a product in this class is the K Series remote gain control. By way of a three pin block connector, a potentiometer (pot) can be wired to the K Series from a remote location. This pot will then act as an attenuator allowing volume adjustment from a remote location. Multiple speakers can also be wired to a single control knob - a particularly handy benefit when K Series speakers are suspended in out-of-reach locations within a venue. Combined with the Energy Management function, this capability presents a compelling solution for many venues.

    Locking IEC Power Cable

    Every K Series loudspeaker is equipped with a locking IEC power connector and cable. With a simple "click" the AC cord creates a positive lock with the amp module all but eliminating accidental disconnect during a performance.

    This feature is especially useful when using either the K10 or K12 as a floor monitor. If damaged or lost, the locking cable can be easily replaced with a standard widely available IEC cable.

    Threaded Pole

    The K Sub features a threaded pole socket which accommodates a 31" positive-fit speaker pole (included). Unlike typical open-cup designs that can cause a speaker to wobble or tilt in the subwoofer receptacle, the K Series threaded mounting system assures a snug, safe fit.

    At the top of the pole, a 35mm circular end cap inserts into any K Series or other fullrange enclosure outfitted with a standard pole receptacle.

    Rugged Construction

    Unlike typical molded loudspeakers, K Series fullrange models are made with ABS (Acrylonitrile Butadiene Styrene) which is harder and more rigid than most traditional plastics. Used for high-pressure or high-impact applications, ABS can withstand greater temperature extremes, resist impact and stay rigid against high pressure fluctuations far better than polypropylene, polystyrene, or polyurethane. ABS is used in golf club heads, very high pressure plumbing, car body parts, helmets and other products requiring robust physical performance.

    Not only is ABS tough, it also delivers acoustic benefits. An ABS enclosure will vibrate less with low frequency audio energy resulting in more and tighter bass. The stability of ABS also makes it ideal for a molded enclosure that is going to be suspended for installation applications.

    Additionally, all K Series speakers are designed to withstand a rigorous series of drop tests and other abuses that make the wear and tear typically encountered by years of real-world use seem tame. Solid cast aluminum handles and an 18 gauge steel grille round out the K Series road-ready design.

    Connectivity

    The K Series is capable of connecting to just about any audio source - a microphone, iPod™ or other MP3/CD player, a musical instrument or mixing console. Inputs can also be combined and mixed at the K Series rear-panel. For instance, a microphone and CD player can be combined for background music with announcements. Or, a musical instrument, MP3 player and microphone can all be combined for solo entertainer applications. Neutrik™ Combo XLR/1/4" and RCA inputs are featured, as well as XLR outputs for either daisy-chaining multiple K Series speakers or providing a mixed output to an amplifier, mixer or other audio device.

    Class D

    K Series features a state of the art, QSC-designed Class-D amplifier module. The benefits of Class D technology in a powered loudspeaker are many. First, because the power supply is much smaller than other amplifier designs, there is a significant weight savings (The K Series module weighs a mere 6 pounds). Also, because Class D amplifiers generate far less heat, they don´t need bulky heatsinks, further reducing the amp´s weight.

    And while amplifier performance in typical designs relies greatly on access to a sturdy, steady AC power source, Class D amplifiers operate with far greater efficiency, drawing less current from the power source.

    Basic linear amplifiers see significant power losses due to heat generated as they cycle between the positive and negative voltage rails. But an ideal semi conductor wants to be either "fully on" or "fully off" in order to maximize efficiency and minimize loss due to heat.

    The basic principle of Class D is to utilize fully-on and fully-off "switches" that operate at a frequency much higher than the audio range so the resulting pulses can be filtered and smoothed out, leaving only the desired audio signal. The result is nearly loss-free operation and far less heat build up when the amplifier is driven continuously at high operating levels.

    Tilt-Direct™ Pole Mount

    Not all performance venues are alike. Sometimes, low ceilings, reflective back walls and other room attributes conspire to work against a system´s ability to deliver sonically pleasing sound to the audience.

    The three K Series fullrange enclosures (K8, K10, K12) feature our unique Tilt-Direct™ adjustable pole-mounting system that lets you put the sound on your audience and keep it off the ceiling and back wall.

    A simple turn of the dial is all it takes to alter the K Series directivity by 7.5 degrees, providing ample opportunity for pleasing results.

    Protections

    K Series is one of the most robust and trouble free systems available anywhere. First, it benefits from the closed design of an active loudspeaker system, offering more protection of both the amplifier and the transducers than would typically be possible with a component system.

    Next, K Series features QSC Guardrail™ technology, originally introduced on our GX Series amplifiers, which prevents destructive clipping distortion and woofer over excursion.

    Heat dispersion is managed by a number of thermal protections including a virtually silent internal fan that engages on-demand during periods when the amp senses high temperatures and turns off when no additional cooling is necessary.

    There is also discreet signal limiting technology to prevent overheating of the amplifier and transducers as well as DC and short-circuit protection such as is found on all rugged, reliable QSC amplifiers.

    Suspension and Mounting

    K Series is equally at home in mounted or flown applications. For mounting to a building structure or truss, the K8, K10 and K12 Yoke Accessory Kits allow for either horizontal or vertical placement. Integrated threaded inserts (2 top, 1 lower rear) may be used with M10 forged eyebolts for suspension. A kit including three eyebolts is available from QSC (M10 KIT).

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