HELIX Ci5 M50FM-S3 COMPOSE 2 Inch 70W RMS Wideband Speaker Pair with FlexMount50 - 3 Ohm

HELIX Ci5 M50FM-S3 COMPOSE 2 Inch 70W RMS Wideband Speaker Pair with FlexMount50 - 3 Ohm

An audiophile-grade 2 inch wideband speaker pair from the HELIX COMPOSE i5 platform, delivering a wide 300 to 20,000 Hz frequency response, FlexMount50 vehicle-specific fitment, and 3 ohm efficiency in an exceptionally compact installation footprint.

Product Overview

The HELIX Ci5 M50FM-S3 is a 2 inch advanced wideband driver from the HELIX COMPOSE i5 series, engineered for sophisticated car audio installations where space constraints, unfavourable mounting angles, or OEM housing limitations make conventional speaker configurations difficult or impossible. Despite its compact 50mm footprint, the Ci5 M50FM-S3 delivers an exceptionally broad usable frequency range of 300 to 20,000 Hz, enabling system layouts that can operate without a separate tweeter, making it an ideal choice for centre channel applications, fullrange systems, or DSP-based setups.

A key feature of the Ci5 M50FM-S3 is its noticeably reduced outer diameter compared to typical 2 inch drivers, combined with the FlexMount50 mounting system. The included universal FlexMount CFM50 MULTI.1 adaptor ring enables installation in an almost infinite range of OEM mounting locations across Audi, Ford, Mercedes, and many other vehicle brands, transforming this universal driver into a vehicle-specific solution with acoustically optimised fitment. The 3 ohm impedance is designed to perfectly harmonise with HELIX and MATCH amplifiers, maximising output efficiency and dynamic capability. Sold as a pair.

Features & Benefits

Exceptional 2 Inch Wideband Frequency Response: The Ci5 M50FM-S3 delivers a usable frequency range of 300 to 20,000 Hz from a single 2 inch driver, enabling tweeter-less system layouts and making it highly versatile for centre applications, fullrange installs, and complex DSP-based configurations in tight spaces.

FlexMount50 Universal Mounting System: The included FlexMount CFM50 MULTI.1 adaptor ring allows the Ci5 M50FM-S3 to be installed in OEM mounting positions across a wide range of vehicle brands including Audi, Ford, and Mercedes, delivering vehicle-specific fitment precision from a universal speaker platform.

3 Ohm High Efficiency Technology: The 3 ohm impedance is specifically engineered to maximise 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.

Powerful Push-Pull Neodymium Magnet System: The push-pull neodymium magnet assembly delivers high sensitivity at 89 dB (2.83V/1m) while keeping distortion to a minimum, providing clean and confident sound performance even at demanding playback levels.

Silicon Coated Paper Cone with Aluminium Dust Cap: The silicon coated paper cone provides high internal damping, a natural and precise tonal character, and suppresses unwanted resonances. The aluminium dust cap is directly bonded to the voice coil, improving transient behaviour and detail resolution well into the upper frequency ranges.

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

Special Rubber Surround for Large Linear Excursion: The specially shaped rubber surround enables an unusually large linear excursion of plus or minus 2.5mm for a 2 inch driver, contributing to high power handling, low distortion playback, and a smooth and wide frequency response free from typical peaks or dips found in compact wideband speakers.

Reduced Outer Diameter for Tight OEM Locations: The Ci5 M50FM-S3 features a significantly reduced outer diameter of 59.8mm compared to conventional 2 inch drivers, enabling installation in very tight OEM mounting locations that standard 2 inch speakers cannot fit.

Technical Specs

Compatible With / Goes Well With

The Ci5 M50FM-S3 is compatible with any OEM mounting location that accommodates a 50.9mm installation diameter and 25.2mm installation depth. The included FlexMount CFM50 MULTI.1 adaptor ring enables vehicle-specific fitment across a wide range of makes and models including Audi, Ford, Mercedes, and many more. Refer to the HELIX FlexMount compatibility guide to confirm the correct adaptor ring for your vehicle.

Goes Well With:

• HELIX and MATCH amplifiers (optimised for 3 ohm loads)
• HELIX COMPOSE component speaker systems for full system builds
• HELIX and MATCH DSP processors and signal processors
• Vehicle-specific FlexMount50 adaptor rings (confirm via HELIX FlexMount compatibility guide)
• HELIX COMPOSE tweeters and midrange drivers for multi-way system expansion

Frequently Asked Questions

Does the Ci5 M50FM-S3 need to be used with a tweeter?

Not necessarily. The Ci5 M50FM-S3 has an exceptionally broad usable frequency response of 300 to 20,000 Hz, which allows it to operate as a fullrange or wideband driver without a separate tweeter in many system configurations. However, for critical listening applications or advanced DSP-based multi-way builds, pairing with a dedicated tweeter may further enhance high-frequency detail and staging. This makes the Ci5 M50FM-S3 highly flexible for both simplified and complex system layouts.

What is the FlexMount50 system and do I need an additional adaptor ring?

FlexMount50 is HELIX's vehicle-specific mounting system that uses specially developed adaptor rings to install COMPOSE FlexMount speakers directly into OEM mounting positions across a wide range of vehicles. The Ci5 M50FM-S3 includes the universal FlexMount CFM50 MULTI.1 adaptor ring in the box, which suits a broad range of vehicle applications. For guaranteed vehicle-specific fitment in your exact model, check the HELIX FlexMount compatibility guide to confirm whether an additional vehicle-specific ring is required for your installation position.

Why is the Ci5 M50FM-S3 rated at 3 ohms instead of the standard 4 ohms?

HELIX COMPOSE speakers use 3 ohm impedance technology specifically to maximise power output and efficiency when used with HELIX and MATCH amplifiers. A 3 ohm load draws more current from the amplifier than a 4 ohm load, 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 M50FM-S3 suitable for centre speaker or fullrange applications?

Yes. The Ci5 M50FM-S3 is specifically highlighted by HELIX as an excellent choice for centre channel applications, fullrange systems, and DSP-based setups that demand outstanding sound quality within minimal space. Its wide frequency response, compact installation diameter, and reduced outer diameter make it particularly well suited to OEM centre dash or door locations where larger drivers cannot be installed.

What is included in the box with the Ci5 M50FM-S3?

Each Ci5 M50FM-S3 pack includes two speakers, two universal FlexMount CFM50 MULTI.1 adaptor rings, 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 in the box, with no additional universal mounting hardware required.