HELIX Ci5 M80FM-S3 COMPOSE 3.15 Inch 90W RMS Midrange Speaker Pair with FlexMount80 - 3 Ohm

HELIX Ci5 M80FM-S3 COMPOSE 3.15 Inch 90W RMS Midrange Speaker Pair with FlexMount80 - 3 Ohm

An audiophile-grade 3.15 inch midrange speaker pair from the HELIX COMPOSE i5 platform, delivering precise midband reproduction across 200 to 6,000 Hz with FlexMount80 vehicle-specific fitment, FlexConnect terminal, and 3 ohm efficiency in a compact installation footprint.

Product Overview

The HELIX Ci5 M80FM-S3 is a 3.15 inch advanced midrange driver from the HELIX COMPOSE i5 series, engineered for demanding multi-way car audio systems where midband clarity, natural tonality, and dynamic accuracy are essential. Its wide usable frequency range of 200 to 6,000 Hz, high 90W RMS power handling, and generous linear excursion make it the centrepiece of any high-quality three-way system build, while its compact form factor opens up installation possibilities in tight OEM locations that conventional 3 inch drivers cannot access.

The Ci5 M80FM-S3 features a noticeably reduced outer diameter of 78.5mm compared to conventional 3 inch drivers, combined with the FlexMount80 mounting system. The two included universal FlexMount CFM80 MULTI.1 and MULTI.2 adaptor rings enable installation across a wide range of OEM positions in vehicles including Mercedes, Porsche, Tesla, and many more. For expanded vehicle-specific compatibility, the optional CFMK80-100 adaptor enables the use of FlexMount100 rings. The automotive-grade FlexConnect terminal provides fast, secure, and fail-safe wiring connection, with optional vehicle-specific WireKits available separately for non-destructive OEM loom integration. Sold as a pair.

Features & Benefits

Precise Midrange Performance for Multi-Way Systems: The Ci5 M80FM-S3 delivers a usable frequency range of 200 to 6,000 Hz, purpose-engineered for accurate midband reproduction in high-quality three-way systems, DSP-optimised setups, and demanding installations where clarity, natural tonality, and dynamics are non-negotiable.

FlexMount80 Universal Mounting System: Two universal FlexMount CFM80 MULTI.1 and MULTI.2 adaptor rings are included, enabling vehicle-specific installation into OEM mounting positions across Mercedes, Porsche, Tesla, and many other vehicle brands. Optional compatibility with FlexMount100 rings is available via the separately available CFMK80-100 adaptor.

Automotive-Grade FlexConnect Terminal: The FlexConnect terminal allows direct connection to the original vehicle wiring harness using vehicle-specific inlay adaptors (A, B, C, D included), maintaining automotive-grade plug connection standards and providing built-in reverse polarity protection for a safe and professional installation.

3 Ohm High Efficiency Technology: The 3 ohm impedance maximises power output and efficiency when paired with HELIX and MATCH amplifiers, delivering a clearly perceptible improvement in dynamics and sound pressure compared to standard 4 ohm configurations, with a sensitivity of 92 dB at 2.83V/1m.

Silicon Coated Paper Cone with Aluminium Dust Cap: The silicon coated paper cone delivers high internal damping and a natural, precise midrange character while suppressing unwanted resonances. The aluminium dust cap optimises frequency response in the upper midrange area, contributing to the driver's smooth and extended high-frequency behaviour.

Narrow Surround Structure for Large Cone Area and Small Diameter: The inward-folded surround edge, bonded in a complex manufacturing process, works with the innovative magnet system to enable a large linear excursion of plus or minus 2.5mm while simultaneously reducing the outer diameter and maximising the effective cone area of 36 cm2 for its class.

Powerful Push-Pull Neodymium Magnet System: The push-pull neodymium magnet assembly delivers 92 dB sensitivity at 2.83V/1m with minimal distortion, providing clean and dynamic midrange performance even at elevated listening levels.

High-Tech Polymer Composite Basket with Glass Sphere Reinforcement: The basket is manufactured from a polymer composite reinforced with glass spheres, providing maximum structural rigidity and minimal self-resonance while eliminating flux modulation and maintaining thermal resistance in compact OEM installation environments.

Optional WireKit Compatibility: Designed for compatibility with optionally available vehicle-specific HELIX WireKits, which allow a fully non-destructive plug-and-play connection to the vehicle's original wiring loom without cutting or modifying factory cables.

Technical Specs

Compatible With / Goes Well With

The Ci5 M80FM-S3 is compatible with any OEM mounting location accommodating a 69.5mm installation diameter and 30.2mm installation depth. The included FlexMount CFM80 MULTI.1 and MULTI.2 adaptor rings enable vehicle-specific fitment across a wide range of makes and models including Mercedes, Porsche, Tesla, and many more. For expanded OEM compatibility, the optional CFMK80-100 adaptor ring enables use of FlexMount100 vehicle-specific rings. Refer to the HELIX FlexMount compatibility guide to confirm the correct adaptor for your vehicle.

Goes Well With:

• HELIX and MATCH amplifiers (optimised for 3 ohm loads)
• HELIX COMPOSE component speaker systems for full three-way system builds
• HELIX and MATCH DSP processors and signal processors
• HELIX vehicle-specific WireKits for non-destructive OEM loom integration (sold separately)
• Optional CFMK80-100 adaptor for FlexMount100 compatibility (sold separately)
• HELIX Ci5 M50FM-S3 2 inch wideband driver for multi-way system expansion

Frequently Asked Questions

What is the FlexConnect terminal and how does it work?

FlexConnect is HELIX's automotive-grade speaker terminal system that allows the Ci5 M80FM-S3 to connect directly to the vehicle's original wiring harness using vehicle-specific inlay adaptors. Four FlexConnect inlay sets (A, B, C, D) are included in the box to cover a broad range of OEM connector types. FlexConnect maintains the automotive standard of the plug connection and provides built-in reverse polarity protection, ensuring a safe and fail-safe connection without cutting or modifying factory wiring. For additional vehicle-specific loom integration, optional HELIX WireKits are available separately.

What is the difference between FlexMount80 and FlexMount100 compatibility?

The Ci5 M80FM-S3 natively uses the FlexMount80 mounting system, with two universal CFM80 MULTI.1 and MULTI.2 adaptor rings included in the box for broad OEM fitment. FlexMount100 is a larger mounting ring system used in certain vehicle-specific OEM positions. By adding the optional CFMK80-100 adaptor (sold separately), the Ci5 M80FM-S3 also becomes compatible with FlexMount100 vehicle-specific rings, significantly expanding the range of OEM installation positions available for this driver.

Why is the Ci5 M80FM-S3 rated at 3 ohms instead of the standard 4 ohms?

HELIX COMPOSE speakers use 3 ohm impedance technology to maximise power output and efficiency when used with HELIX and MATCH amplifiers. A 3 ohm load draws more current from the amplifier, resulting in higher output power and a clearly perceptible improvement in dynamics and sound pressure. All HELIX and MATCH amplifiers are engineered to handle 3 ohm loads safely and optimally. If using a non-HELIX amplifier, confirm it is stable at 3 ohm loads before installation.

Is the Ci5 M80FM-S3 suitable for use as a standalone fullrange driver?

The Ci5 M80FM-S3 is specifically engineered as a midrange driver for three-way systems, with a usable frequency range of 200 to 6,000 Hz. While it performs exceptionally within this range, it is not designed as a fullrange driver. For a fullrange or wideband application in a compact 2 inch footprint, the HELIX Ci5 M50FM-S3 (300 to 20,000 Hz) is the recommended alternative from the COMPOSE i5 range.

What is included in the box with the Ci5 M80FM-S3?

Each Ci5 M80FM-S3 pack includes two speakers, two universal FlexMount CFM80 MULTI.1 and MULTI.2 adaptor rings, two universal connection cables, two FlexConnect inlay sets (A, B, C, D), two speaker gaskets, two mounting rings with grilles, and one set of mounting material. Everything needed for a complete installation into a compatible OEM location is included, with optional vehicle-specific WireKits and the CFMK80-100 adaptor available separately.