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HK Audio Linear SUB 4000 A Active 18" Subwoofer

SKU: 12777

BARCODE: 4039373020205

R 36,339.00

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HK Audio L Sub 4000 A Overview


The perfect complement to any Linear system. Linear Subwoofers boast a range of professional features to provide crisp, dynamic bass for both the Linear 3 and Linear 5 series of mid/high loudspeakers. Each of the Linear Subwoofers can be configured in a half-stack, full-stack, 2.1 configuration, or mono sub cluster.



HK's powerful Linear series delivers incredible high-definition audio gig after gig. High-performance amplification combined with precision designs and architecture give you the best possible sound from your system. Blow your audience away every single night with the power and definition of a Linear series PA system.



High-SPL design for any situation


Power isn't everything, but it definitely helps. Combining HK's incredible 1200W class-D power amp design with excellent sensitivity, the L SUB 4000 A is capable of producing an absolutely enormous maximum SPL of up to 137dB. Perfect for large audiences, a Linear PA system is the perfect choice for both portable and installed setups.




  • 18'' subwoofer with 1200W of class-D power
  • Rugged double vented bandpass enclosure crafted from birch multiplex
  • Powerful low-end ranging from 30Hz to 100Hz
  • Can serve as a sub-low add-on to the L SUB 2000 A to beef up the 30Hz - 70Hz range
  • Capable of delivering a huge maximum SPL of up to 137dB (half space)
  • Single 18'' woofer with a 4'' voice coil
  • Eight integrated HK Audio MultiGrips
  • The perfect addition to any Linear 5 mid/high units, particularly the Linear 5 LTS A loudspeakers




  • Maximum SPL: 135dB half space (at 10 percent THD)
    • Peak: 137dB half space (at 10 percent THD)
    • Calculated: 138dB half space
  • Frequency Response:
    • +/-3dB: 39Hz - X-over
    • -10dB: 31Hz - X-over
  • Power Rating: 1200W
  • Amplifier: Class-D
  • Active Protection Circuits:
    • Under-voltage
    • Thermal
    • Short circuit
    • Over-current
    • Subsonic filter, 24dB/oct
    • Peak limiter
  • Low-Frequency Speaker: 1 x 18'' (with advanced ventilated voice coil gap)
  • Cut-Off Frequency Active: 70/100Hz variable with 24dB/oct
  • Connections:
    • 2 x XLR combo inputs (balanced)
    • 2 x XLR thru (balanced)
    • 2 x XLR mid/high out
  • Input Sensitivity: +4dBu at gain centre-notched
  • Pole Mount: 2 x M20 (K&M)
  • Handles: 8 x HK Audio MultiGrip
  • Enclosure: Birch multiplex
  • Grille: 2mm metal grille backed with black acoustic foam
  • Finish: Acrylic enamel, black
  • Dimensions: 910mm x 510mm x 810mm (W x H x D)
  • Weight: 59kg / 130.1lbs

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