Helix CB K165.2-S3

Helix CB K165.2-S3 – 6.5″ 2-way component speaker kit

The Helix CB K165.2-S3 is a 2-way component speaker kit with a 165 mm midbass, a 20 mm tweeter and a separate crossover 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.

The kit runs at 3 Ω, which matches HELIX and MATCH amplifiers and brings a clear gain in efficiency and maximum sound pressure. The midbass uses a lightweight but stiff injected polypropylene cone, a ventilated steel basket, a powerful magnet and a soft polyurethane dustcap; the tweeter combines a coated silk dome with a highly efficient neodymium magnet. The tweeter is mechanically designed for safe connection and easy professional installation and accepts optional FlexMount20 adaptor rings, so it can be placed in the vehicle’s original tweeter positions. A compact separate crossover with 12 dB tweeter slope, 4-step tweeter level adjustment and tweeter protection completes the set.

Key Features

• 2-way component kit: separate midbass, tweeter and crossover combining high efficiency with strong sound performance
• 3 Ω technology: maximises amplifier power output, tuned for HELIX and MATCH amplifiers
• Compact design: easier installation in cramped spaces
• 20 mm silk dome tweeter: coated silk dome for clear, detailed treble
• Neodymium tweeter magnet: highly efficient, with highly linear magnetic flux
• Flexible tweeter mounting: compact tweeter body with several mounting options; flush-mount and angle-mount pods included
• FlexMount20 ready: tweeter accepts optional FlexMount20 adaptors for an acoustically tuned fit in the original vehicle locations
• 165 mm polypropylene midbass: lightweight injected polypropylene cone with the stiffness needed for good sound
• Ventilated steel basket: additional vent holes for voice coil cooling and higher power handling
• Polyurethane dustcap: tuned for a smooth upper-midrange response
• Separate compact crossover: easy to integrate, 12 dB tweeter slope, 4-step tweeter level control and tweeter protection

Drivers & Construction

• Included drivers: 2 × CB T20FM-S tweeter, 2 × CB W165-S3 midbass, 2 × CB FX165.2 crossover
• Tweeter CB T20FM-S: 20 mm coated silk dome, neodymium magnet, 20 mm voice coil, 4 Ω, Fs 2,000 Hz
• Midbass CB W165-S3: 165 mm injected polypropylene cone, 25 mm voice coil (winding height 8.9 mm), sturdy steel basket with ventilation holes, powerful magnet system, soft polyurethane dustcap

Acoustic Performance

• Power handling: 80 W RMS / 120 W max.
• Impedance: 3 Ω nominal (tweeter 4 Ω)
• Sensitivity: 92 dB @ 2.83 V / 1 m; 88 dB @ 1 W / 1 m
• Frequency response: 60 Hz – 22,000 Hz
• T/S parameters (midbass): Re 3.0 Ω, Fs 62 Hz, Qms 4.50, Qes 0.90, Qts 0.75, Vas 14.5 l, Cms 520 µm/N, Bl 4.1 Tm, Sd 141 cm², Mms 13.2 g, Rms 1.10 kg/s
• Max. linear excursion (Xmax): ±2.5 mm

Crossover

• Type: separate passive crossover CB FX165.2, compact housing (103.3 × 50.4 × 25.0 mm)
• Slope: 12 dB/octave high-pass for the tweeter
• Tweeter level: 4-step adjustment to adapt to the mounting position
• Protection: integrated tweeter protection
• Tuning: crossover split extensively fine-tuned for a balanced result

Installation Notes

• Midbass: outer Ø 166.0 mm, installation Ø 143.0 mm, installation depth 61.4 mm
• Tweeter: outer and installation Ø 32.0 mm, installation depth 9.8 mm
• Tweeter mounting: flush-mount and angle-mount pods included
• FlexMount20: optional vehicle-specific FlexMount20 adaptor rings allow the tweeter to be installed in the factory position

Technical Specifications

Scope of Delivery

2 x Tweeter CB T20FM-S
2 x Midbass CB W165-S3
2 x Crossover CB FX165.2
2 x Tweeter mounting accessories
1 x Mounting material