Helix Ci3 C165.2FM-S3 MK2

Helix Ci3 C165.2FM-S3 MK2 – 6.5″ 2-way FlexMount coaxial speaker, 3 Ω

The Ci3 C165.2FM-S3 MK2 is a 165 mm 2-way coaxial speaker from the HELIX COMPOSE i3 line, part of the HELIX COMPOSE platform, a reworked generation of universal speakers that Audiotec Fischer develops in the vehicle for the vehicle, aiming to merge the flexibility of a universal speaker with the fit advantages of vehicle-specific systems. It is designed to fit easily into cars and to work with HELIX and MATCH amplifiers, with a focus on safe connection and operation.

The 3 Ω design brings a noticeable gain in efficiency and sound pressure. A Cenosphere-coated paper cone, a glass-bead-reinforced polymer basket and a powerful magnet system form the midbass, while the coaxial 20 mm tweeter uses a black aluminium dome and neodymium magnet. FlexMount165 adaptor rings, the ProConnect terminal and WireKit compatibility allow acoustically optimised fitting in original mounting positions.

Key Features

• 3 Ω technology: high efficiency for maximum amplifier output
• ProConnect terminal: automotive-grade, interlocked and reverse-polarity protected; works with bare cable or WireKit flat plugs
• 20 mm aluminium tweeter: light yet rigid black aluminium dome for detailed treble
• Neodymium tweeter magnet: refined design with linear magnetic flux
• Cenosphere cone: 165 mm coated paper cone for precise reproduction
• Glass-bead reinforced basket: polymer composite that reduces ringing
• Powerful magnet system: for efficiency and fast impulse response
• Integrated crossover: 6 dB slope
• FlexMount165: car-specific adaptor rings for original mounting positions
• WireKit ready: optional car-specific WireKits for non-destructive installation

Drivers & Construction

• Tweeter: coaxial 20 mm (0.75″) black aluminium dome, neodymium magnet, 20 mm voice coil
• Midbass: Paper cone with Cenosphere coating – hollow microspheres embedded in a polyamide layer raise stiffness and internal damping while keeping the cone light; 25 mm voice coil (10.5 mm winding height); ProConnect terminal; FlexMount165 compatible
• Basket: Polymer composite basket reinforced with glass beads – rigid, low in self-resonance, reduces flux modulation of the magnet system, heat-resistant and compact for tight mounting spaces

Acoustic Performance

• Power handling: 100 W RMS / 150 W max
• Impedance: 3 Ω (Re 3.1 Ω)
• Sensitivity: 92 dB @ 2.83 V / 1 m; 88 dB @ 1 W / 1 m
• Frequency response: 60 Hz – 25,000 Hz
• T/S parameters: Fs 72 Hz, Qts 0.82, Qes 1.04, Qms 4.02, Vas 11.5 l, Sd 133 cm², Mms 10.4 g, BL 3.8 Tm, Cms 466 µm/N, Xmax ±3.2 mm

Crossover

• Type: integrated in the speaker
• Tweeter: 6 dB highpass

Installation Notes

• Dimensions: outer diameter 165 mm, mounting diameter 142 mm, mounting depth 60.7 mm
• FlexMount165: optional vehicle-specific CFMK165 adaptor rings are listed as accessories
• WireKits: optional locking adaptor cables to the factory harness
• Other accessories listed: CiA SG165

Technical Specifications

Scope of Delivery

2 x Ci3 C165.2FM-S3 MK2
1 x Mounting material