Helix Ci7 W165FM-S3

Helix Ci7 W165FM-S3 – 165 mm High-End Midbass with FlexMount165

The Ci7 W165FM-S3 is a 6.5″ (165 mm) high-end midbass from the HELIX COMPOSE platform, which re-engineers universal speakers so they combine universal flexibility with vehicle-specific advantages – “developed inside the vehicle, for the vehicle”. The i7 series is the high-end line of COMPOSE, made in Germany and clearly influenced by the sister brand BRAX; its impedances are matched to HELIX and MATCH amplifiers. The 3 Ω design increases efficiency and maximum sound pressure, and the driver is intended for the door/midbass position of high-quality systems.

The proprietary, handmade UHD (Ultra High Damping) paper cone delivers an excellent frequency and impulse response, and the basket is made of polymer composite reinforced with glass beads – rigid, low in self-resonance, with reduced magnetic flux modulation and good thermal resistance, allowing a more compact basket. A large 37 mm voice coil ensures thermal stability, and the speaker is prepared for car-specific FlexMount165 adaptor rings and the ProConnect terminal with WireKits.

Key Features

• 3 Ω technology: higher amplifier output and efficiency with HELIX and MATCH amplifiers.
• UHD paper cone: handmade Ultra High Damping cone for excellent impulse and frequency response.
• Glass-bead reinforced polymer basket: high rigidity and minimal ringing.
• Rubber surround: for high linear cone excursion (Xmax ±3.7 mm).
• Polyurethane dustcap: optimized for upper-midrange response.
• 37 mm (1.46″) voice coil: for thermal stability and high power handling.
• Powerful magnet system: for high efficiency and low distortion.
• ProConnect terminal: automotive-grade, interlocked, reverse-polarity protected; takes speaker cables, flat-plug adaptor cables or WireKits.
• FlexMount165: car-specific adaptor rings for installation in the original mounting position.
• Made in Germany: part of the German-made COMPOSE i7 series.

Drivers & Construction

• Cone: UHD crafted paper, cone area (Sd) 131 cm².
• Voice coil: 37 mm diameter, 13.4 mm winding height.
• Basket: polymer composite reinforced with glass beads.
• Surround / dustcap: rubber surround, polyurethane dustcap.
• Terminal: ProConnect.

Acoustic Performance

• Power handling: 150 W RMS / 225 W max.
• Impedance: 3 Ω (DC resistance 2.9 Ω).
• Sensitivity: 92 dB @ 2.83 V / 1 m; 88 dB @ 1 W / 1 m.
• Frequency response: 50 – 3,500 Hz.
• T/S parameters: Fs 60 Hz, Qms 3.00, Qes 0.68, Qts 0.55, Vas 11.6 l, Cms 480 µm/N, BxL 4.8 Tm, Mms 14.8 g, Rms 1.83 kg/s.
• Max. linear excursion (Xmax): ±3.7 mm.

Installation Notes

• Dimensions: outer diameter 165 mm (6.5″), installation diameter 142 mm (5.59″), installation depth 65.8 mm (2.59″).
• FlexMount165: vehicle-specific adaptor rings (CFMK165 series, sold separately); use the FlexMount Finder to select the correct ring.
• WireKits: compatible, sold separately; the page lists e.g. CWK FX.W-550CC and CWK TES1.W-225PC.

Technical Specifications

Scope of Delivery

2 x Ci7 W165FM-S3
2 x Connection cable
2 x Mounting material