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EAN: 4057204321802
S 3M
Helix 3” / 75 mm cone midrange speaker with novel basaltfiberpaper compound cone
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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


Technical data

Power RMS / max. 75 / 150 Watts
(highpass 400 Hz at 24 dB/Oct.)
Impedance Z 4 Ω
DC resistance Re 3.2 Ω
Frequency response 400 Hz - 6,000 Hz
Resonance frequency Fs 130 Hz
Mechanical Q factor Qms 4.47
Electrical Q factor Qes 0.48
Total Q factor Qts 0.43
Compliance Cms 396 µm/N
Equivalent air volume Vas 0.57 L
Force factor B*I 4.6 Tm
Sensitivity 1 W / 1 m SPL 86 dB
Cone area Sd 32 cm²
Moving mass Mms 3.8 g
Cone material Basalt-fiber-paper compound
Mechanical resistance Rms 0.69 kg/s
Voice coil diameter ø 25 mm
Voice coil winding height 8 mm
Max. linear excursion Xmax +/- 2 mm
Outer diameter ø 90 mm / 3.54″
Installation diameter ø 73 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.

Note: The enclosure should always be filled with appropriate damping material.

Scope of delivery
2 x Midrange speaker HELIX S 3M
2 x Grille
1 x Data sheet
1 x Mounting pattern