Helix Ci7 M100FM-S3

Helix Ci7 M100FM-S3 – 100 mm High-End Midrange with UHD Paper Cone

The Ci7 M100FM-S3 is a 4″ (100 mm) high-end midrange driver from the HELIX COMPOSE platform, which re-engineers universal speakers so they combine universal flexibility with vehicle-specific advantages – “developed inside the vehicle, for the vehicle”. The i7 series is the high-end line of COMPOSE, made in Germany and clearly influenced by the sister brand BRAX; its impedances are matched to HELIX and MATCH amplifiers. Its 3 Ω design is aimed at higher efficiency and maximum sound pressure, making it a strong midrange choice for active or multi-way systems.

The heart of the driver is a handmade, proprietary UHD (Ultra High Damping) paper cone, produced in a complex process for an excellent frequency and impulse response. It sits in a basket made of polymer composite reinforced with glass beads – rigid, low in self-resonance, with reduced magnetic flux modulation and good thermal resistance, allowing a more compact basket. A push-pull neodymium magnet system, a FlexConnect terminal with reverse polarity protection and the included universal FlexMount100 ring complete the package.

Key Features

• 100 mm high-end midrange: 4″ driver with 25 mm voice coil for high power handling and low thermal compression.
• 3 Ω technology: maximizes amplifier output and efficiency with HELIX and MATCH amplifiers.
• UHD paper cone: handmade Ultra High Damping cone for excellent impulse and frequency response.
• Glass-bead reinforced polymer basket: high rigidity and minimal ringing.
• Rubber surround: specially shaped for high linear cone excursion.
• Polyurethane dustcap: optimized for the upper midrange.
• Push-pull neodymium magnet: for high efficiency and low distortion.
• FlexConnect terminal: automotive-grade plug connection to vehicle harnesses with reverse polarity protection.
• FlexMount100: universal ring with standard 4-point mounting included; car-specific twist-lock adaptors available.
• Made in Germany: part of the German-made COMPOSE i7 series.

Drivers & Construction

• Cone: UHD crafted paper cone, cone area (Sd) 55 cm².
• Voice coil: 25 mm diameter, 5.5 mm winding height.
• Magnet: push-pull neodymium system.
• Basket: polymer composite reinforced with glass beads.
• Surround / dustcap: rubber surround, polyurethane dustcap.
• Terminal: FlexConnect.

Acoustic Performance

• Power handling: 100 W RMS / 150 W max.
• Impedance: 3 Ω (DC resistance 3.0 Ω).
• Sensitivity: 91 dB @ 2.83 V / 1 m; 87 dB @ 1 W / 1 m.
• Frequency response: 110 – 7,000 Hz.
• T/S parameters: Fs 85 Hz, Qms 4.58, Qes 0.52, Qts 0.47, Vas 2.5 l, Cms 590 µm/N, BxL 4.3 Tm, Mms 5.9 g, Rms 0.69 kg/s.
• Max. linear excursion (Xmax): ±1.3 mm.

Installation Notes

• Dimensions: outer diameter 98 mm (3.86″), 104.5 mm (4.11″) with universal mounting ring; installation diameter 89 mm (3.50″); installation depth 26.9 mm (1.06″).
• FlexMount100: universal ring (standard 4-point mounting) included; car-specific FlexMount100 adaptors sold separately for the original mounting location.
• FlexConnect: FlexConnect inlay A included; further FlexConnect inlays are compatible accessories. Universal and crossover connection cables are supplied.

Technical Specifications

Scope of Delivery

2 x Ci7 M100FM-S3
2 x Universal FlexMount100 (with standard 4-point mounting)
2 x FlexConnect inlay A
2 x Universal connection cable
2 x Crossover connection cable
2 x Mounting material