Helix S 3M - 75mm Midrange


✓ Midrange

✓ Magnet: Neodymium

✓ FQ-Range: 400 - 6000Hz

✓ SPL: 86dB

✓ Power: 75 Watt RMS

✓ Impedance: 4 Ohm

✓ Outer diameter: 75mm

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



A cone midrange driver in an elegant design, trimmed for maximum sound quality – and thus the perfect addition to any fully active 3-way speaker system.

The highly rigid membrane consists of a novel basalt fiber-paper compound. An ideal combination to ensure clear and precise sound even at high volumes  In addition to maximum uncoloured mid-range reproduction, the S 3M also offers extremely low distortion thanks to the linear neodymium magnet system.

The dream team is the combination with the S 1T tweeter and a S 6B or S 4B woofer. Driven by a power amplifier from Audiotec Fischer, the S loudspeakers perform at their best and provide the perfect basis for absolute top sound systems!


✓ 3” / 75 mm cone midrange speaker with novel basaltfiberpaper compound cone – a perfect combination of lowest weight, high stiffness and perfect inner damping

Highly efficient, compact neodymium magnet system for linear drive and minimum distortion

Low-resonant basket made from glassfiber reinforced plastic with optimized voice coil cooling for high power handling

Grille included



Power RMS / max.


75 / 150 Watts
(highpass > 400 Hz at 24 dB/Oct.)
Impedance Z4 Ω
DC resistance Re3.2 Ω
Frequency response 400 Hz - 6,000 Hz
Resonance frequency Fs130 Hz
Mechanical Q factor Qms4.47
Electrical Q factor Qes0.48
Total Q factorQts0.43
ComplianceCms396 µm/N
Equivalent air volumeVas0.57 L
Force factor B*I4.6 Tm
Sensitivity 1 W / 1 mSPL86 dB
Cone area Sd32 cm²
Moving mass Mms3.8 g
Cone material Basalt-fiber-paper compound
Mechanical resistance Rms0.69 kg/s
Voice coil diameterø25 mm
Voice coil winding height 8 mm
Max. linear excursion Xmax+/- 2 mm
Outer diameterø90 mm / 3.54"
Installation diameterø73 mm / 2.87"
Installation depth 37 mm / 1.46"
Recommended enclosure volumes  
Sealed box with minimum 200 ml net volume  
Net volumes Recommended DSP / amplifier settings
0.2 liter (System resonance: 230 Hz) Crossover frequency: 500 Hz
Min. filter slope: 12 dB/Oct.
0.4 liter (System resonance: 190 Hz) Crossover frequency: 450 Hz
Min. filter slope: 18 dB/Oct.
0.6 liter (System resonance: 170 Hz) Crossover frequency: 400 Hz
Min. filter slope: 24 dB/Oct.

Scope of delivery

✓ 2 x Midrange speaker Helix S 3M

✓ 2 x Grille

✓ 1 x Data sheet

1 x Mounting pattern

✓ Shipping Infos (Click)

Shipping countrys:

✓ Germany

✓ Austria

✓ France


Data sheet

Power Handling
75 Watt
RMS Power Speaker
51 - 100 Watt


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