K-Array Thunder KS4 I Ultra-light, Self-Powered dual 18” subwoofer with DSP and power outputs (Black)

K-Array SKU: KS4 I
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Sale price$13,002.00


The Thunder-KS4 I is a compact active subwoofer featuring a 2x18” cone drivers and a powerful 4x 2500W @ 4Ω audio amplifier module with built-in DSP. The audio power output connectors allow the Thunder subwoofers to drive a wide range of K-array passive loudspeakers. Compatible with midrange loudspeaker and other passive subwoofers, the self powered Thunder subwoofers with DSP are designed to be the core devices in K-array sound reinforcement systems.


  • Type:  

    Active subwoofer

  • Transducers:  

    2 x 18" neodymium magnet woofer

  • Frequency Response:  


    30 Hz – 150/450 Hz (-6 dB) crossover dependant


  • Crossover:  

    DSP-controlled, Low Pass @ 150 Hz, preset dependant

  • Max SPL:  


    141 dB


  • Coverage:  


  • Connectors:  


    Line Input
    2x XLR-F analog / AES3
    Line Output
    2x XLR-M Link analog / AES3
    Speaker Output
    2x SpeakON NL4
    powerCON TRUE1 TOP
    Networking and Data
    1x RJ45
    4x USB-A


  • Nominal Impedance:  

    4ohm subwoofer

  • Controllers:  


    Wi-Fi dedicated Mobile APP
    K-framework3 via wired Ethernet connection


  • Built-in DSP:  


    Input gain, routing matrix, delay, full parametric IIR filters (Peaking, Shelving, Hi/ Lo pass, Hi/Lo Butterworth), Onboard preset, Remote monitoring


Handling and Finishes

  • Dimensions (W x H x D):  

    1106 x 500 x 580 mm
    (43.5 x 19.7 x 22.8 in)

  • Weight:  

    60 kg (132.3 lb)

  • Material:  

    Polyurea coated birch plywood

  • Colors:  

    Black/White/Custom RAL

At Creartion Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.

  • Most in-stock orders placed Monday-Friday before 1PM PST ship the same day. Orders placed after 1PM will ship the next day of business. General restrictions apply; please see our full shipping policy here.
  • We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.

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