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P 12W

12“ / 300 mm subwoofer with aluminum diecast basket and extremely stiff Kevlar / paper sandwich cone, optimized for use in a compact vented enclosure

P 12W

There are only a few manufacturers who understand the art of improving an already excellent basis. HELIX has optimized the new woofer with loving attention to detail and included elements of the legendary SPXL 12 in the high-precision series. The rubber surround is not only sewn to the cone, it is also firmly screwed to the basket using the machined mounting ring. The cone itself – a Kevlar / paper-sandwich design – is also new and stiffer than before to withstand even the strongest impulses without warping.

  • Concave PP dustcap with embossed HELIX logo
  • Long-excursion rubber surround with stitching for highest mechanical rating
  • Extremely stiff Kevlar / paper sandwich cone
  • Machined aluminum mounting ring to fix the rubber surround
  • Double-vented voice coil for minimized compression effects
  • Large magnet system for low Qts
  • Torsion-free aluminum diecast basket with diamond cut
  • Oversized voice coil for maximum electrical power handling and high linear excursion
  • Rugged butyl magnet cover with HELIX lettering for perfect magnet protection
  • Solid push terminals


Power handling RMS / Max 400 / 800 Watts
Impedance 4 Ohms
Voice coil diameter 76 mm
Voice coil winding height 25 mm
Max. linear excursion +/- 8.5 mm
Cone area 511 cm²
Moving mass 173 g
DC resistance 3 Ohms
Resonance frequency 27 Hz
Mechanical Q factor 3.81
Electrical Q factor 0.27
Total Q factor 0.25
Equivalent air volume 72 L
Voice coil inductance 1.79 mH
Force factor 18.1 Tm
Efficiency 1 W / 1 m 89 dB
Outer diameter 313 mm / 12.3“
Cutout diameter 282 mm / 11.1“
Mounting depth 142 mm / 5.6“
Recommended enclosure  
Ported box  
Vented net volume 50 L
Port diameter 10 cm
Port area: 78 cm²
Port length 28 cm
Port tuning frequency 34 Hz

1 x Subwoofer P 12W

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