Helix Ci3 W165FM-S2

Helix Ci3 W165FM-S2 – 6.5″ / 165 mm performance 2 Ω midbass

The Ci3 W165FM-S2 is a 165 mm midbass from the COMPOSE i3 series. The COMPOSE i3 line is the price-performance series of the HELIX COMPOSE platform, a redesign of proven universal speakers that aims to combine the strengths of universal drivers with those of vehicle-specific systems. According to HELIX, the i3 series adopts mechanical technologies derived from the i7 series, and its impedances are matched to HELIX and MATCH amplifiers. This version uses a 2 Ω impedance to extract maximum power from a suitable amplifier.

Its paper cone is coated with Cenospheres – hollow spheres in a polyamide layer – for added stiffness and internal damping at low weight, and it sits in a glass-bead reinforced polymer basket that resists self-resonance and heat. The automotive-grade ProConnect terminal and readiness for car-specific FlexMount165 adaptors and WireKits allow a clean, non-destructive installation in the original mounting location.

Key Features

• 6.5″ performance midbass: 165 mm driver combining sound quality with flexible installation options
• 2 Ω technology: high efficiency and 2 Ω impedance for maximum amplifier power output
• Cenosphere-coated paper cone: hollow micro-spheres embedded in a polyamide layer stiffen the paper cone and raise its internal damping, keeping it light yet stable for precise, detailed reproduction
• Glass-bead reinforced polymer basket: a high-tech polymer composite that is rigid, rings less, avoids flux modulation, copes well with heat and allows a more compact basket
• Shaped rubber surround: specially contoured to allow high linear cone excursion
• Polyurethane dust cap: tuned to optimise the upper-midrange response
• 25 mm voice coil: 1″ voice coil for high power handling
• Powerful magnet system: for high efficiency and good impulse response
• ProConnect terminal: automotive-grade, interlocking terminal with reverse-polarity protection; accepts standard speaker cable or flat plugs via the optional WireKits and withstands high electrical and mechanical stress
• Klippel-verified development: driver development verified with the Klippel Analyzer System
• FlexMount165 ready: designed for optional car-specific FlexMount165 adaptor rings for acoustically optimised installation in the original mounting position
• WireKit ready: designed for optional car-specific WireKits – adaptor cables built to automotive standards that connect the speaker to the factory harness or an optional crossover without cutting the original wiring

Drivers & Construction

• Cone: paper with Cenosphere coating, polyurethane dust cap
• Voice coil: 25 mm diameter, 11.3 mm winding height
• Basket: polymer composite reinforced with glass beads
• Surround: specially shaped rubber surround
• Terminal: ProConnect
• Delivered as: pair: 2 × Ci3 W165FM-S2, 2 × mounting material

Acoustic Performance

• Power handling: 100 W RMS / 150 W max
• Impedance: 2 Ω (DC resistance 1.8 Ω)
• Sensitivity: 94 dB @ 2.83 V / 1 m; 88 dB @ 1 W / 1 m
• Frequency response: 60 Hz – 3,500 Hz
• Thiele/Small: Fs 74 Hz, Qms 3.92, Qes 0.92, Qts 0.74, Vas 8.8 l, Cms 370 µm/N, Bl 3.5 Tm, Sd 133 cm², Mms 12.5 g, Rms 1.48 kg/s
• Xmax: ±3.7 mm

Installation Notes

• Outer diameter: 165 mm / 6.5″
• Installation diameter: 142 mm / 5.59″
• Installation depth: 60.7 mm / 2.39″
• FlexMount165: car-specific adaptor rings listed as accessories: CFMK165 VW.1, VW.2, MB.1, SKO.1, HYU.1, AUD.1, VOL.1
• Other accessories named: WireKit CWK TES1.W-225PC, CiA SG165, CiA FR165.10, Ci3 FX-WLP.2

Technical Specifications

Scope of Delivery

2 x Ci3 W165FM-S2
2 x Mounting material