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Helix K8W

Helix K8W




Rich bass out of compact dimensions

The chassis of the K subwoofer series can all be used in very compact enclosures in which they perform magnificently with exceptional bass performance. Especially when it comes to using the available space in the vehicle as well as possible due to an individual enclosure design, these woofers open up entirely new possibilities for installation without making any acoustic compromises.


Clever down to the last detail

The highly stiff cone made of hand-scooped paper fibers in connection with the heavy-duty driver system not only converts amplifier power easily and without compression effects into loads of sound pressure but also scores sonically with subtle beats.


Maximum flexible connection – 2 x 2 or 1 x 2 Ohms

The chassis of the K-Subwoofer series are available with 1 x 2 Ohms single voice coil (SVC2) or, alternatively, 2 x 2 Ohms dual voice coil (DVC2). Thus, these subwoofers always offer the right solution for every amplifier configuration to get the maximum performance – whether mono, 2-channel, or even multi-channel amplifier.


"All inclusive" for the do-it-yourselfer

In addition, the solid protective grille and gasket are also included.
For optimal bass performance in DIY installations, you can find recommendations for sealed and vented enclosures with all parameters, such as net volume, port tuning frequency, and DSP settings, in our technical data sheet.



  • Extremely stiff, hand-scooped paper cone
  • Double-ventilated voice coil for minimum compression effects and high power handling
  • Rugged magnet cover with HELIX lettering for perfect magnet protection
  • Long-excursion rubber surround for the highest mechanical rating
  • 2 x 2 Ohms dual voice coil for flexible system configuration
  • Solid push terminals
  • Powerful magnet system for compact vented enclosures
  • Grille and gasket included in delivery
  • Technical data

    Power RMS / max. P 300 / 600 Watts
    Impedance  Z 2 x 2 Ω
    DC resistance  Re 2 x 1.6 Ω
    Resonance frequency  Fs 37 Hz
    Mechanical Q factor  Qms 3.56
    Electrical Q factor  Qes 0.46
    Total Q factor Qts 0.41
    Compliance Cms 262 μm/N
    Equivalent air volume Vas 17 L
    Force factor  B*I 10.7 Tm
    Sensitivity 1 W / 1 m SPL 86.0 dB
    Cone area  Sd 219 cm²
    Moving mass  Mms 69 g
    Cone material   Hand-scooped paper cone
    Mechanical resistance  Rms 4.54 kg/s
    Voice coil diameter ø 50.8 mm
    Voice coil winding height   24 mm
    Max. linear excursion  Xmax +/- 8.0 mm
    Outer diameter ø 213 mm / 8.38"
    Installation diameter ø 182 mm / 7.17"
    Installation depth   101 mm / 3.98"
    Recommended enclosure volumes    
    Sealed box    
    Net volume   8 L
    Lower limiting frequency (-3dB)   50 Hz
    Recommended DSP settings   Recommended "self-define" highpass filter with 50 Hz cut-off frequency and Q = 1.5,
    additional EQ filter 115 Hz / Q = 1.0 / -2.5 dB
    Vented box    
    Net volume   8 L
    Port diameter ø 60 mm / 2.36"
    Port area   28 cm²
    Port length   42 cm / 16.5" (angled port)
    Port tuning frequency Fb 43 Hz
    Lower limiting frequency (-3dB)   45 Hz
    Recommended DSP settings   Recommended "self-define" highpass filter with 43 Hz cut-off frequency and Q = 1.5,
    additional EQ filter 120 Hz / Q = 0.8 / -3.5 dB

    Scope of delivery

    1 x Subwoofer HELIX K 8W [DVC2]
    1 x Grille
    1 x Gasket
    1 x Data sheet

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