• K331201
  • 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
  • 1 x 2 Ohms single voice coil
  • 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

    K 12W SVC2 – 1 x 2 Ohms
Power RMS / max.  P 300 / 600 Watt
Impedance  Z 1 x 2 Ω
DC resistance  Re 1 x 2.0 Ω
Resonance frequency  Fs 31 Hz
Mechanical Q factor  Qms 4.03
Electrical Q factor  Qes 0.54
Total Q factor Qts 0.47
Compliance Cms 142 μm/N
Equivalent air volume Vas 53 L
Force factor  B*I 11.9 Tm
Sensitivity 1 W / 1 m SPL 89.0 dB
Cone area  Sd 515 cm²
Moving mass  Mms 146 g
Cone material   Hand-scooped paper cone
Mechanical resistance  Rms 9.20 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 316 mm / 12.44" 
Installation diameter ø 286 mm / 11.26
Installation depth   144 mm / 5.67"
Recommended enclosure volumes  
Sealed box  
Net volume   22 L
Lower limiting frequency (-3dB)   40 Hz
Recommended DSP settings   “Self-Define” Highpass: 37 Hz / Q = 1.5;
EQ Filter: 80 Hz / Q = 1.3 / -3 dB
Vented box  
Net volume   40 L
Port diameter ø 100 mm / 3.94"
Port area   78 cm²
Port length   35 cm / 13.8"
Port tuning frequency Fb 34 Hz
Lower limiting frequency (-3dB)   37 Hz
Recommended DSP settings   “Self-Define” Highpass: 34 Hz / Q = 0.8;
EQ Filter: 80 Hz / Q = 0.7 / -2 dB

Scope of delivery

1 x Subwoofer HELIX K 12W [SVC2]
1x Grille
1 x Gasket
1 x Data sheet

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