Helix Ci3 M100FM-S3

Helix Ci3 M100FM-S3 – 4″ / 100 mm performance 3 Ω midrange

The Ci3 M100FM-S3 is a 100 mm midrange driver from the COMPOSE i3 series – the price-performance line of the HELIX COMPOSE platform, which uses mechanical technologies taken from the i7 series. Its 3 Ω impedance is matched to HELIX and MATCH amplifiers for higher efficiency and maximum sound pressure.

The paper cone carries a Cenosphere coating that adds stiffness and internal damping without adding weight, and the push-pull neodymium magnet system keeps the installation depth down to just 30 mm while maintaining high efficiency. The FlexConnect terminal plugs into vehicle-specific wiring with reverse-polarity protection, and a universal FlexMount100 ring is included; car-specific FlexMount100 adaptors are available as options.

Key Features

• 4″ performance midrange: 100 mm driver combining sound quality with flexible installation options
• 3 Ω technology: high efficiency to maximise amplifier output
• Cenosphere-coated paper cone: hollow micro-spheres embedded in a polyamide layer stiffen the paper cone and raise its internal damping, keeping it light yet stable for precise, detailed reproduction
• Glass-bead reinforced polymer basket: a high-tech polymer composite that is rigid, rings less, avoids flux modulation, copes well with heat and allows a more compact basket
• Shaped rubber surround: specially contoured to allow high linear cone excursion
• Polyurethane dust cap: tuned to optimise the upper-midrange response
• 25 mm voice coil: 1″ voice coil for high power handling
• Shallow neodymium magnet: powerful push-pull neodymium magnet system for low installation depth and high efficiency
• FlexConnect terminal: automotive-grade terminal for a fast, secure and fail-safe connection with reverse-polarity protection
• Universal FlexMount100 ring included: standard 4-point mounting ring supplied in the box
• FlexMount100 ready: designed for optional car-specific FlexMount100 adaptors for installation in the original mounting location

Drivers & Construction

• Cone: paper with Cenosphere coating, polyurethane dust cap
• Voice coil: 25 mm diameter, 4.8 mm winding height
• Magnet: push-pull neodymium magnet system
• Basket: polymer composite reinforced with glass beads
• Surround: specially shaped rubber surround
• Terminal: FlexConnect
• Delivered as: pair: 2 × driver, 2 × universal FlexMount100 ring, 2 × FlexConnect inlay A, 2 × universal connection cable, 2 × mounting material

Acoustic Performance

• Power handling: 80 W RMS / 120 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: 120 Hz – 6,000 Hz
• Thiele/Small: Fs 146 Hz, Qms 4.49, Qes 1.02, Qts 0.83, Vas 1.1 l, Cms 280 µm/N, Bl 3.4 Tm, Sd 53 cm², Mms 4.3 g, Rms 0.87 kg/s
• Xmax: ±2.0 mm

Installation Notes

• Outer diameter: 98 mm / 3.86″ (104.5 mm / 4.11″ with universal mounting ring)
• Installation diameter: 89 mm / 3.50″
• Installation depth: 30 mm / 1.18″
• FlexMount100: car-specific CFMK100 adaptors are listed as accessories (e.g. for BMW, Mercedes-Benz, Tesla, Jaguar Land Rover and Volvo)
• Other accessories named: FlexConnect inlays, WireKits CWK FX.M-550CC and CWK POR2.M-225FC, CiA SG100

Technical Specifications

Scope of Delivery

2 x Ci3 M100FM-S3
2 x Universal FlexMount100 (with standard 4-point mounting)
2 x FlexConnect inlay A
2 x Universal connection cable
2 x Mounting material