Helix K Series subwoofer elements work in small enclosures. Both reflex and sealed. Affordable elements with 1x2 ohm voice coil offer very good sound quality for the price in a small space

Power RMS / max.    P    300 / 600 Watts

Impedance     Z    1 x 2 Ω

DC resistance     Re   1 x 2.0 Ω

Resonance frequency     Fs   37 Hz

Mechanical Q factor     Qms    4.01

Electrical Q factor     Qes    0.49

Total Q factor    Qts    0.44

Compliance    Cms   190 μm/N

Equivalent air volume    Vas   13.4 L

Force factor     B*I   10.2 Tm

Efficiency 1 W / 1 m   SPL    85.0 dB

Cone area     Sd    219 cm²

Moving mass     Mms    86 g

Cone material      Hand-scooped paper cone

Mechanical resistance    Rms    6.1 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   213 mm / 8.38″

Installation diameter    ø   182 mm / 7.17″

Installation depth       101 mm / 3.98″

        

Recommended enclosure volumes         

Sealed box        

Net volume        10 L

Lower limiting frequency (-3dB)       45 Hz

Recommended DSP settings       Recommended ″self-define″ highpass filter with 46 Hz cut-off frequency and Q = 1.5,

additional EQ filter 90 Hz / Q = 1.0 / -2.5 dB

         

Vented box         

Net volume      9 L

Port diameter    ø   60 mm / 2.36″

Port area      28 cm²

Port length       46 cm / 18.1″ (angled port)

Port tuning frequency    Fb   38 Hz

Lower limiting frequency (-3dB)        41 Hz

Recommended DSP settings       Recommended ″self-define″ highpass filter with 40 Hz cut-off frequency and Q = 1.2,

additional EQ filter 90 Hz / Q = 0.9 / -2 dB