Helix C 6B - 165mm Reference-Mid-Woofer


✓ Mid-Woofer

✓ Magnet: Ferrite

✓ Resonance-FQ: 54Hz

✓ SPL: 88dB

✓ Power: 150 Watt RMS

✓ Impedance: 4 Ohm

✓ Outer diameter: 165mm

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  • New
Stock status: Out of stock
Out of stock
delivery time 6 - 8 weeks
packing unit: pair



These reference speakers in our C-series raise the bar to a new level of fantastic sound quality. The legendary sisal woofer cones are equipped with an additional structural damping layer made of an elastomer, which again improves the acoustic properties of the driver. The tweeter enclosure also underwent a complete overhaul. Anyone who wants to operate these loudspeakers as fully active speakers (e.g. using our new digital signal processors) can put together the system of their choice by combining the individual components.


✓ High-end mid-woofer with sturdy aluminum diecast basket

Mid-woofer cone with scooped, long-fibered sisal with additional elastomer structural damping

Virtually compression-free conversion of the amplifier power into sound pressure

Lowest manufacturing tolerances and exclusive use of selected materials

Grille included



Power RMS / max. P150 / 300 Watts
Impedance Z4 Ω
DC resistance Re3.4 Ω
Resonance frequency Fs54 Hz
Mechanical Q factor Qms11.1
Electrical Q factor Qes0.55
Total Q factorQts0.53
ComplianceCms490 µm/N
Equivalent air volumeVas12.4 L
Force factor B*I6.1 Tm
Efficiency 1 W / 1 mSPL88 dB
Cone area Sd135 cm²
Moving mass Mms17.8 g
Cone material Sisal with elastomer structural damping
Mechanical resistance Rms0.54 kg/s
Voice coil diameterø37 mm 
Voice coil winding height 12 mm
Max. linear excursion Xmax+/- 3 mm
Outer diameterø166 mm / 6.54"
Installation diameterø145 mm / 5.71"
Installation depth 67 mm / 2.64"
Recommended enclosure volumes  
Sealed box  
Net volume 8 L
Lower limiting frequency (-3dB) 68 Hz
Vented box  
Net volume 15 L
Port diameterø60 mm / 2.36"
Port area 28 cm²
Port length 16 cm / 6.30"
Port tuning frequencyFb49 Hz
Lower limiting frequency (-3dB) 52 Hz

Scope of delivery

✓ 2 x High-End Mid-woofer Helix C 6B

✓ 1 x Grille

✓ 1 x Mounting ring

✓ Shipping Infos (Click)

Shipping countrys:

✓ Germany

✓ Austria

✓ France


Data sheet

Power Handling
150 Watt
RMS Power Speaker
101 - 150 Watt

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