Helix Compose Ci3 C100.2FM-S3 – 4″ 3 Ohm Coaxial Speakers

Description

HELIX Ci3 C100.2FM-S3

A compact, high-performance 2-way coaxial speaker system designed for precise sound reproduction and seamless vehicle integration. Built on the HELIX COMPOSE platform, it blends advanced materials with efficient engineering to deliver exceptional clarity, balance, and dynamic range.

Performance Overview

The i3 coaxial systems are built to deliver the full experience of a premium 2-way setup. With high-quality components and smart mechanical design, they ensure seamless integration into modern vehicles while maintaining consistent performance. When paired with HELIX or MATCH amplifiers, these speakers achieve their full potential in both clarity and power output.

High Efficiency

This model uses advanced 3 Ohm technology to maximize power transfer from the amplifier. The result is higher sound pressure and greater efficiency without requiring excessive power, making it ideal for compact vehicle installations.

Cenosphere Paper Cone

The midrange driver uses a cone coated with “Cenosphere” technology—a layer embedded with microscopic hollow spheres within a polyamide film. This combination increases stiffness and internal damping while keeping weight low, ensuring highly accurate and detailed sound reproduction.

High-Tech Polymer Basket

The speaker basket is made from a reinforced polymer composite infused with glass spheres. This design minimizes self-resonance, improves magnetic stability, and resists heat deformation, all while reducing weight. Its compact form makes it easy to install in vehicles with limited mounting space.

Clear Highs and Thermal Stability

The 0.75” (20 mm) titanium dome tweeter delivers bright, detailed treble with excellent control. Its low mass and high internal damping help maintain precision and eliminate distortion, while the neodymium magnet ensures high linearity and excellent thermal resistance.

FlexMount100 – Vehicle-Specific Integration

The FlexMount system uses specialized adaptor rings that allow these universal speakers to fit seamlessly into a wide range of vehicles. With the matching FlexMount100 adaptor ring, installation in the factory speaker position becomes quick, secure, and acoustically optimized.

FlexConnect – Easy, Secure Wiring

The FlexConnect terminal enables a direct connection to the vehicle’s original wiring harness using optional, car-specific adaptors. This maintains OEM-level connection quality, ensures polarity safety, and makes installation fast and reliable.

Features

• 2-way coaxial system for clean, dynamic sound

• 3 Ohm impedance for efficient power handling

• Compact design suitable for tight mounting areas

• FlexConnect terminal for plug-and-play vehicle integration

• Compatible with FlexMount100 adaptor system

Tweeter

• 0.75” / 20 mm titanium dome for crisp, detailed treble

• Neodymium magnet for strong magnetic control and thermal stability

Midrange

• 4” / 100 mm Cenosphere-coated paper cone for accuracy and detail

• Polymer composite basket reinforced with glass beads for strength and vibration control

• Shallow neodymium magnet system for space efficiency

Crossover

•  Integrated 6 dB slope for smooth frequency distribution
• Designed for the optionally available car-specific FlexMount100 adaptors which allow an acoustically optimized and professional integration in the original mounting location of the vehicle

  Technical data

  Power handling RMS / Max.	P	80 / 120 Watts
  Frequency response		100 Hz – 25,000 Hz
  Impedance	Z	3 Ω
  Sensitivity	SPL	91 dB @ 2.83V / 1m 87 dB @ 1W / 1m
  Outer diameter	ø	98.0 mm / 3.86”
  Installation diameter	ø	89.0 mm / 3.50”
  Installation depth		30.0 mm / 1.18”
  Midrange
  Impedance	Z	3 Ω
  DC resistance	Re	3.0 Ω
  Resonance frequency	Fs	137 Hz
  Mechanical Q factor	Qms	4.37
  Electrical Q factor	Qes	0.78
  Total Q factor	Qts	0.66
  Compliance	Cms	456 μm/N
  Equivalent air volume	Vas	2.1 L
  Force factor	B*l	3.2 Tm
  Cone area	Sd	57 cm2
  Moving mass	Mms	3.0 g
  Mechanical resistance	Rms	0.58 kg/s
  Voice coil diameter	ø	25 mm
  Voice coil winding height		4.8 mm
  Max. linear excursion	Xmax	+/- 2.0 mm
  Tweeter
  Voice coil diameter	ø	20 mm
  Features
  Tweeter		Titanium dome and neodymium magnet
  Midbass		Paper with Cenosphere coating, FlexConnect terminal, neodymium magnet and FlexMount100
  Crossover		Integrated, 6 dB highpass

  Compatibility

  • FlexMount100
  • FlexConnect inlays