Features
- 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. | P | 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
