HELIX S 4B
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!
Features
- 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
Technical data
- Power RMS / max: 70 / 140 Watts
- Impedance:4 Ω
- DC resistance: 3.4 Ω
- Frequency response: 75 Hz - 6,000 Hz
- Resonance frequency: 120 Hz
- Mechanical Q factor: 4.24
- Electrical Q factor: 1.11
- Total Q factor: 0.88
- Compliance: 232 μm/N
- Equivalent air volume: 1.2 L
- Force factor: 4.1 Tm
- Sensitivity 1 W / 1 m: 89 dB
- Cone area: 61 cm²
- Moving mass: 5.9 g
- Cone material: Basalt-fiber-paper compound
- Mechanical resistance: 1.19 kg/s
- Voice coil diameter: 25 mm
- Voice coil winding height: 12 mm
- Max. linear excursion: +/- 3 mm
- Outer diameter: 102 mm / 4.01"
- Installation diameter: 92.3 mm / 3.63"
- Installation depth: 46.5 mm / 1.83"