Helix K 12W - 12” Subwoofer

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  • Regular price £139.99
Tax included.

Do-it-yourselfers, here's your chance to create your personal sub that perfectly fits into your car!
From the technical point of view the two drivers K 10W and K12W are absolutely identical with the subwoofers that are installed in the K series enclosure subs.

Just have a look at the Thiele/Small parameters and you will easily notice that those are designed for compact vented cabinets yet leaving plenty of "headroom" for designing your own preferred sound characteristic. If you prefer to play it safe, just choose the same net volume and port tuning frequency like our enclosure subs K 10E and K 12E for outstanding bass performance.

So what are you waiting for? Start your "tailor-made subwoofer project" right now!

  • 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
Power RMS / max.  P 300 / 600 Watt
Impedance  Z 2 x 2 Ω
DC resistance  Re 2 x 1.6 Ω
Resonance frequency  Fs 32 Hz
Mechanical Q factor  Qms 3.70
Electrical Q factor  Qes 0.46
Total Q factor Qts 0.41
Compliance Cms 179 μm/N
Equivalent air volume Vas 66 L
Force factor  B*I 13.7 Tm
Efficiency 1 W / 1 m SPL 90.0 dB
Cone area  Sd 515 cm²
Moving mass  Mms 134 g
Cone material   Hand-scooped paper cone
Mechanical resistance  Rms 7.33 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   18 L
Lower limiting frequency (-3dB)   49 Hz
Vented box  
Net volume   30 L
Port diameter ø 100 mm / 3.94"
Port area   78 cm²
Port length   28 cm / 9.84"
Port tuning frequency Fb 39 Hz
Lower limiting frequency (-3dB)   39 Hz