Helix Compose i3 Ci3 K100.2FM-S3 Component 4 Inch FlexMount Speakers 80w RMS

The Helix Compose i3 Ci3 K100.2FM-S3 is a 4-inch (100 mm) 2-way component speaker system rated at 80W RMS at 3 ohms, featuring a Cenosphere-coated paper midrange cone and a 20 mm titanium dome tweeter. It is part of the Helix Compose i3 range and uses FlexMount adaptor rings to fit like a vehicle-specific speaker in a wide range of cars.

Key specifications

• Type: 2-way component system, 4-inch (100 mm) midrange
• Power handling: 80W RMS, 120W max
• Impedance: 3 ohms
• Sensitivity: 91 dB (2.83V/1m), 87 dB (1W/1m)
• Frequency response: 120 Hz to 25 kHz
• Tweeter: 20 mm (0.75 in) titanium dome
• Midrange: 89 mm installation diameter, 30 mm installation depth
• Crossover: Ci3 FX-UNI.2 with 6-stage tweeter level adjustment
• Compatibility: FlexMount20, FlexMount100, FlexConnect inlays

HELIX Ci3 K100.2FM-S3

HELIX COMPOSE: the perfect speaker for any composition

The HELIX COMPOSE platform was developed to answer the increasingly complex demands of modern vehicle acoustics. Following the principle of "developed inside the vehicle, for the vehicle", COMPOSE combines classic universal speakers with the advantages of vehicle-specific systems. Innovative materials, smart engineering and high efficiency come together to deliver fantastic sound quality and enormous dynamics in any vehicle.

Performance highlight

The i3 component systems deliver a first-class 2-way sound experience using high-quality materials and practical engineering designed for straightforward in-car installation. All components are tuned to work together and pair ideally with HELIX and MATCH amplifiers for maximum performance. New mechanical technologies also focus on connection safety and seamless vehicle integration.

High efficiency

HELIX COMPOSE uses 3-ohm technology, which harmonises with all HELIX and MATCH amplifiers and delivers a clear gain in efficiency and maximum sound pressure. Certain models are also available as optional 2-ohm variants for absolute maximum performance when paired with an appropriate amplifier.

Cenosphere paper cone

The "Cenosphere" coating applies hollow spheres within a polyamide layer to the cone surface. This increases stiffness and optimises internal damping, producing an exceptionally stable yet lightweight cone with outstanding precision in sound reproduction.

High-tech polymer basket

The HELIX COMPOSE i3 speaker baskets are made from a high-tech polymer composite reinforced with glass spheres. This delivers maximum stability with minimal self-resonance, eliminates flux modulation of the magnetic system and resists thermal influences — while keeping basket dimensions compact for easier installation in tight spaces.

Stunning highs and outstanding stability

The 0.75" / 20 mm tweeter uses a titanium dome that combines low moving mass, high inner damping and strong thermal resistance for brilliant, compression-free treble reproduction.

Perfectly separated

The Ci3 FX-UNI.2 crossover is tuned specifically for use with the HELIX COMPOSE i3 components. It offers 6-stage tweeter level adjustment with a 12 dB slope for optimal adaptation to the installation position, plus integrated tweeter protection. Its compact dimensions suit tight installation spaces, and it is compatible with COMPOSE Connect and WireKit technologies for a safe, polarity-protected connection to automotive standards.

COMPOSE Connect

COMPOSE Connect is a plug-in connection system that simplifies installation with HELIX COMPOSE components. Proprietary plastic housings accept standard flat plugs and couplings, creating a secure, polarity-reversing-proof connection that meets automotive standards.

FlexMount20 and FlexMount100: universal meets car-specific

FlexMount is a mounting system using specially developed adaptor rings that allow COMPOSE FlexMount speakers to be installed in an almost unlimited range of vehicles. The universal speaker becomes a vehicle-specific fit, installed in the original position and acoustically optimised with the matching FlexMount adaptor ring.

WireKits: plug and play at its best

HELIX WireKits connect a HELIX COMPOSE speaker kit directly to the vehicle's original wiring harness. Made to automotive industry standards, these lockable adaptor cables are built to handle the demanding environmental conditions found in everyday vehicle installations.