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Shallow design – rich bass


The K 10S is the ultimate problem solver in realizing mainly flat and compact enclosure designs.  Its extremely low installation depth opens up new possibilities for installation without making any acoustic compromises.  Thanks to its sizeable double voice coil and low resonance frequency, the K 10S doesn’t need to hide from woofers with greater installation depth when it comes to bass performance.


Smart down to the very last detail.

In connection with the heavy-duty dual voice coil, the highly stiff sandwich paper cone converts amplifier power easily and without compression effects into loads of sound pressure and scores sonically with subtle beats. 

A particular highlight: the magnet system has a threaded hole on the back and thus allows the woofer to be fixed to the enclosure's back panel. This way, housing vibrations can be effectively reduced even with thin walls because with flat constructions, every millimeter of construction depth counts.


Flexible connection

The double voice-coil design offers more flexibility when selecting an appropriate power amp. Whether 1 x 4 Ohms, 2 x 2 Ohms, or 1 x 1 Ohm impedance – this low bass specialist makes any configuration easily possible.


"All inclusive" for the do-it-yourselfer

In addition to the high-quality connection terminal with gold-plated binding posts, a 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, or DSP settings, in our technical data sheet.



  • Chassis with particularly low installation depth – optimized for compact and shallow enclosure constructions
  • 2 x 2 Ohms dual voice coil for flexible system configuration
  • Magnet system with a threaded hole on the back – allows screwing to the back panel of the enclosure for stabilization and reduction of enclosure vibrations
  • Rugged magnet cover with HELIX lettering for perfect magnet protection
  • Extremely stiff sandwich paper cone
  • Long-excursion rubber surround for the highest mechanical rating
  • Enclosure connection terminal, 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 34 Hz
    Mechanical Q factor  Qms 6.37
    Electrical Q factor  Qes 0.49
    Total Q factor Qts 0.45
    Compliance Cms 198 μm/N
    Equivalent air volume Vas 34 L
    Force factor  B*I 12.7 Tm
    Sensitivity 1 W / 1 m SPL 87.0 dB
    Cone area  Sd 353 cm²
    Moving mass  Mms 112 g
    Cone material   Sandwich paper cone
    Mechanical resistance  Rms 3.73 kg/s
    Voice coil diameter ø 50.8 mm
    Voice coil winding height   19 mm
    Max. linear excursion  Xmax +/- 6.0 mm
    Outer diameter ø 262 mm / 10.31"
    Installation diameter ø 229 mm / 9.01"
    Installation depth   84.5 mm / 3.33"
    Recommended enclosure volumes    
    Sealed box    
    Net volume   14 L
    Lower limiting frequency (-3dB)   46 Hz
    Recommended DSP settings   Recommended "self-define" highpass filter with 45 Hz cut-off frequency and Q = 1.3;
    additional EQ filter 100 Hz / Q = 1.0 / -3 dB
    Vented box    
    Net volume   16 L
    Port diameter ø 70 mm / 2.76"
    Port area   38 cm²
    Port length   38 cm / 14.96"
    Port tuning frequency Fb 37 Hz
    Lower limiting frequency (-3dB)   39 Hz
    Recommended DSP settings   Recommended "self-define" highpass filter with 37 Hz cut-off frequency and Q = 1.2;
    additional EQ filter 95 Hz / Q = 0.7 / -3 dB

    Scope of delivery

    1 x Subwoofer HELIX K 10S
    1x Grille
    1 x Gasket
    1x Connecting terminal
    1 x Data sheet

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