Helix CB C87.2-S3

Helix CB C87.2-S3 – 3.5″ (87 mm) 2-way coaxial speaker

The Helix CB C87.2-S3 is a 2-way coaxial speaker system with a 87 mm (3.4″) midrange and a 13 mm PEI dome tweeter from the BASIC series of the HELIX COMPOSE platform. COMPOSE was created by reworking proven universal speakers to meet the demands of modern vehicles, combining the flexibility of universal designs with the fit of vehicle-specific systems under the motto “developed inside the vehicle, for the vehicle”. BASIC is the entry point into the COMPOSE range and is designed to be driven by HELIX and MATCH amplifiers.

Its 3 Ω design is tuned to match HELIX and MATCH amplifiers, increasing efficiency and maximum sound pressure. The midrange combines a lightweight yet stiff injected polypropylene cone with a ventilated steel basket, a powerful magnet system and a soft polyurethane dustcap for a refined upper midrange, while the tweeter uses a lightweight PEI dome driven by a highly efficient neodymium magnet. An integrated 6 dB high-pass crossover and a compact construction make it suited to tight installation spaces.

Key Features

• 2-way coaxial system: combines high efficiency with strong sound performance in a single speaker
• 3 Ω technology: gets the maximum power output from the amplifier, especially with HELIX and MATCH amplifiers
• Compact design: makes installation easier in cramped mounting locations
• 13 mm PEI dome tweeter: provides accurate, detailed treble
• Neodymium tweeter magnet: highly efficient, with high magnetic flux linearity
• 87 mm (3.4″) midrange: lightweight injected polypropylene cone with the stiffness needed for good sound
• Ventilated steel basket: sturdy basket with additional ventilation holes for voice coil cooling and high power handling
• Powerful magnet system: optimises impulse response of the midrange
• Polyurethane dustcap: soft dustcap that optimises the upper-midrange response
• Integrated crossover: built-in 6 dB high-pass for the tweeter

Drivers & Construction

• Tweeter: 13 mm PEI dome, neodymium magnet, 13 mm voice coil
• Midrange: 87 mm (3.4″), injected polypropylene cone, 25 mm voice coil (winding height 8.3 mm), steel basket with ventilation holes, soft polyurethane dustcap

Acoustic Performance

• Power handling: 40 W RMS / 60 W max.
• Impedance: 3 Ω (DC resistance Re 3.0 Ω)
• Sensitivity: 88 dB @ 2.83 V / 1 m; 84 dB @ 1 W / 1 m
• Frequency response: 110 Hz – 22,000 Hz
• T/S parameters (midrange): Fs 92 Hz, Qms 3.80, Qes 0.74, Qts 0.62, Vas 1.5 l, Cms 820 µm/N, Bl 2.9 Tm, Sd 36 cm², Mms 3.6 g, Rms 0.52 kg/s
• Max. linear excursion (Xmax): ±2.2 mm

Crossover

• Type: integrated in the speaker
• Slope: 6 dB high-pass for the tweeter

Installation Notes

• Outer diameter: 86.9 mm / 3.43″
• Installation diameter: 79.0 mm / 3.11″
• Installation depth: 42.0 mm / 1.65″
• Compact design: intended to simplify installation in tight spaces

Technical Specifications

Scope of Delivery

2 x CB C87.2-S3
1 x Mounting material