• K331000
  • DE 29323089


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 good as possible due to an individual enclosure design, these woofers open up completely new possibilities for installation without making any acoustic compromises.

Clever down to the last detail

The extremely 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 offers the right solution for every amplifier configuration to get the maximum performance out of it – 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 as well as 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
  • Long-excursion rubber surround for highest mechanical rating
  • Very long linear excursion
  • 2 x 2 Ohms dual voice coil for flexible system configuration
  • Solid push terminals
  • Powerful magnet system for compact vented enclosures
  • Rugged magnet cover with HELIX lettering for perfect magnet protection
  • 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 36 Hz
Mechanical Q factor  Qms 4.50
Electrical Q factor  Qes 0.43
Total Q factor Qts 0.39
Compliance Cms 218 μm/N
Equivalent air volume Vas 34 L
Force factor  B*I 12.3 Tm
Efficiency 1 W / 1 m SPL 88.0 dB
Cone area  Sd 333 cm²
Moving mass  Mms 91 g
Cone material   Hand-scooped paper cone
Mechanical resistance  Rms 4.56 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 262 mm / 10.31"
Installation diameter ø 232 mm / 9.13"
Installation depth   126 mm / 4.96"
Recommended enclosure volumes  
Sealed box  
Net volume   12 L
Lower limiting frequency (-3dB)   53 Hz
Recommended DSP settings   “Self-Define” Highpass: 45 Hz / Q = 1.5;
EQ Filter: 120 Hz / Q = 1.0 / -3 dB
Vented box  
Net volume   19 L
Port diameter ø 70 mm / 2.76"
Port area   38 cm²
Port length   22 cm / 8.66"
Port tuning frequency Fb 43 Hz
Lower limiting frequency (-3dB)   43 Hz
Recommended DSP settings   “Self-Define” Highpass: 37 Hz / Q = 1.5;
EQ Filter: 115 Hz / Q = 0.7 / -2 dB

Scope of delivery

1 x Subwoofer HELIX K 10W
1 x Grille
1 x Gasket
1 x Data sheet
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