HELIX COMPOSE Ci5 W165FM-S3 - 6.5" Midrange Woofer Pair, FlexMount | 3Ω

HELIX COMPOSE Ci5 W165FM-S3 - 6.5" Midrange Woofer Pair, FlexMount | 3Ω

HELIX COMPOSE. The perfect speaker for any composition.

Born out of the increasingly demanding challenges of modern automobile technology and the HELIX-typical pursuit of intelligent solutions, we made the progressive redesign of proven universal speaker systems our mission. The result: our innovative HELIX COMPOSE platform that, according to the motto "developed inside the vehicle, for the vehicle", combines classic universal speakers with the advantages of vehicle-specific systems. Innovative materials and the latest technologies paired with smart, practical engineering – the best of both worlds in harmony: high efficiency, fantastic sound quality and enormous dynamics that fit in any vehicle. HELIX COMPOSE – universal speakers evolved.

The Sound Sensation for sophisticated music lovers The HELIX COMPOSE i5 series is the link between i7 and i3, created for sophisticated music lovers with a sparked ambition for a true hi-fi experience. A lovechild of phenomenal sound and unmatched practicality: Developed with the vision of unique speaker highlights that are also true problem solvers. All speaker impedances are perfectly matched for the combination with our HELIX and MATCH amplifiers, guaranteeing maximum performance at any time. In addition, we implemented our COMPOSE-exclusive mechanical technologies that offer unbeatable practical benefits.

High efficiency HELIX COMPOSE equals smart engineering and accordingly implements highly efficient 3 Ohm technology, that perfectly harmonizes with all HELIX and MATCH amplifiers and at the same time allows a clearly perceptible plus in efficiency and maximum sound pressure.

Versatility at its finest The Ci5 W165FM-S3 midbass is a true all-rounder within the COMPOSE platform. With its finely tuned acoustic design, it effortlessly adapts to both classic two-way setups and more complex three-way configurations. A key element of this versatility is the precisely engineered phase plug, which not only reduces mechanical compression and supports more even sound dispersion, but also significantly enhances the impulse response in the upper midrange. Matched in color to the dome of the Ci5 T25FM-CA tweeter, it creates a visually cohesive pairing – ideal for systems where sonic excellence and aesthetic harmony go hand in hand. The lightweight yet exceptionally rigid paper cone features a premium silicon coating, allowing for an impressively low resonance frequency while extending the upper midrange performance. The result is a loudspeaker that excels in every discipline – with precision, dynamics, and a clear focus on musical expression.

HELIX Ci5 W165FM-S3 Features & Benefits

6.5" / 165mm Advanced Midbass - Exceptional sound performance with versatile physical integration options for maximum installation flexibility

High Efficiency and 3 Ohms Technology - Maximized power output of amplifiers with clearly perceptible plus in efficiency and maximum sound pressure

Silicon Coated Paper Cone - Excellent impulse response and unmatched frequency response with lightweight yet exceptionally rigid construction

Integrated Phase Plug - Improved upper midrange reproduction, reduced compression effects, and increased thermal power handling of the voice coil

Engineered for Maximum Flexibility - Delivers impressive depth and stunning dynamics in both 2-way and 3-way system configurations

High-Tech Polymer Composite Basket - Reinforced with glass beads for enormous rigidity and minimized ringing with maximum stability

Specially Shaped Rubber Surround - High linear cone excursion capability for extended dynamic range and performance

Large 1.46" / 37mm Voice Coil - Ensures minimum thermal compression and high power handling with exceptional reliability

Automotive Grade ProConnect Connection Terminal - Allows use of conventional speaker cables or fast, secure connection via optionally available WireKits

Powerful Magnet System - Highest efficiency and extremely low distortion for premium audio performance

FlexMount165 Ready - Designed for optionally available car-specific FlexMount165 adaptors for acoustically optimized integration

WireKit Compatible - Designed for optionally available car-specific WireKits allowing non-destructive integration

Technical Specifications:

SKU: COMPOSE Ci5 W165FM-S3
Type: Woofer
Size: 165mm | 6.5"
Driver Power | Watts RMS: 125
Voice Coil x Impedance: 1 x 3Ω
Sensitivity 2.83V/1m | dB: 92
Installation Depth | mm: 67
Power Handling RMS / Max: 125 / 175 Watts
Impedance: 3 Ω
DC Resistance: 3.1 Ω
Frequency Response: 50 Hz - 5,000 Hz
Resonance Frequency: 50 Hz
Mechanical Q Factor: 2.38
Electrical Q Factor: 0.50
Total Q Factor: 0.41
Compliance: 742 µm/N
Equivalent Air Volume: 17.9 L
Force Factor: 5.2 Tm
Sensitivity SPL: 92 dB @ 2.83 V / 1m, 88 dB @ 1W / 1m
Cone Area: 131 cm²
Moving Mass: 14.0 g
Cone Material: Silicon coated paper cone
Mechanical Resistance: 1.83 kg/s
Voice Coil Diameter: ø37 mm
Voice Coil Winding Height: 13.7 mm
Max. Linear Excursion: +/- 3.9 mm
Outer Diameter: ø165 mm / 6.5"
Installation Diameter: ø142 mm / 5.59"
Installation Depth: 66.8 mm / 2.63"
Features: ProConnect terminal, FlexMount165
Brand: HELIX COMPOSE Series

Compatible With / Goes Well With

• FlexMount165 adapter rings
• WireKits connection systems
• HELIX and MATCH amplifiers
• Ci5 T25FM-CA tweeter (color-matched)
• 2-way and 3-way system configurations

Kit Contents

• 2x Ci5 W165FM-S3 midrange woofers
• 2x Mounting material

Installation Applications:

High-Performance 2-Way Systems: Perfect for premium 2-way component systems requiring exceptional midbass performance and upper midrange extension

Advanced 3-Way Configurations: Ideal midrange driver for complex 3-way systems where precise frequency reproduction and phase coherence are critical

HELIX COMPOSE System Builds: Essential component for complete HELIX COMPOSE speaker systems with FlexMount integration capabilities

Professional Audio Installations: Designed for professional installations requiring maximum flexibility and acoustic optimization in original vehicle locations

Amplifier-Matched Systems: Specifically engineered for optimal performance with HELIX and MATCH amplifiers using 3-ohm technology for maximum efficiency

Weight

Approximately 3.2kg

For professional auto sparks and audiophile enthusiasts demanding superior midrange performance, the HELIX Ci5 W165FM-S3 provides the essential midbass foundation for exceptional sound systems. With its innovative COMPOSE technology and FlexMount compatibility, it's the perfect woofer for transforming any vehicle into a professionally equipped audiophile platform.