Helix S 4B - 10cm Mid-Woofer


✓ Mid-Woofer

✓ Magnet: Ferrite

✓ FQ-Range: 75 - 6000Hz

✓ SPL: 89dB

✓ Power: 70 Watt RMS

✓ Impedance: 4 Ohm

✓ Outer diameter: 102mm

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  Fast Shipping

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  • New
Stock status: Very high
In stock
delivery time 2 - 4 days
packing unit: pair



Elegant designed mid-woofer trimmed for maximum sound quality.

The extremely rigid cone consists of a novel basalt-fiber-paper compound – the perfect combination to guarantee clear and straight sound even at high volume levels. Beside a powerful bass reproduction and peerlessly neutral mids, the S 4B impresses with exceptionally low distortion.

A dream team is the combination with the S 1T tweeter that ideally complements the frequency range. Together with an Audiotec Fischer power amplifier, the S loudspeakers strike up to top form and provide the perfect basis for absolute top sound systems!


✓ 4” / 100 mm mid-woofer with novel basalt-fiber-paper compound cone – a perfect combination of lowest weight, high stiffness and inner damping

Specially shaped rubber surround for larger effective cone area and increased maximum excursion

Individual HELIX basket with additional ventilation holes for better voice coil cooling and high power handling

Rugged rubber magnet boot with HELIX-logo

Gold-plated terminals



Power RMS / max.P70 / 140 Watts
Impedance Z4 Ω
DC resistance Re3.4 Ω
Frequency response 75 Hz -
6,000 Hz
Resonance frequency Fs120 Hz
Mechanical Q factor Qms4.24
Electrical Q factor Qes1.11
Total Q factorQts0.88
ComplianceCms232 μm/N
Equivalent air volumeVas1.2 L
Force factor B*I4.1 Tm
Sensitivity 1 W / 1 mSPL89 dB
Cone area Sd61 cm²
Moving mass Mms5.9 g
Cone material Basalt-fiber-paper compound
Mechanical resistance Rms1.19 kg/s
Voice coil diameterø25 mm
Voice coil winding height 12 mm 
Max. linear excursion Xmax+/- 3 mm
Outer diameterø102 mm / 4.01"
Installation diameterø92.3 mm / 3.63"
Installation depth 46.5 mm / 1.83"
Recommended enclosure volumes  
Sealed box  
Net volume 3 L
Lower limiting frequency (-3dB) 100 Hz

Scope of delivery

✓ 2 x Mid-woofer Helix S 4B

✓ 1 Mounting material

✓ 1 x Data sheet

1 x Mounting pattern

✓ Shipping Infos (Click)

Shipping countrys:

✓ Germany

✓ Austria

✓ France


Data sheet

Power Handling
70 Watt
RMS Power Speaker
51 - 100 Watt


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