Helix CB C100.2-S3 – 4″ (100 mm) 2-way coaxial speaker

The Helix CB C100.2-S3 is a 2-way coaxial speaker system with a 100 mm (4″) midbass and a 20 mm silk 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 midbass 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 coated silk 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
20 mm silk dome tweeter: provides accurate, detailed treble
Neodymium tweeter magnet: highly efficient, with high magnetic flux linearity
100 mm (4″) midbass: 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 midbass
Polyurethane dustcap: soft dustcap that optimises the upper-midrange response
Integrated crossover: built-in 6 dB high-pass for the tweeter

Drivers & Construction

Tweeter: 20 mm silk dome, neodymium magnet, 20 mm voice coil
Midbass: 100 mm (4″), injected polypropylene cone, 25 mm voice coil (winding height 8.9 mm), steel basket with ventilation holes, soft polyurethane dustcap

Acoustic Performance

Power handling: 60 W RMS / 90 W max.
Impedance: 3 Ω (DC resistance Re 3.0 Ω)
Sensitivity: 86 dB @ 2.83 V / 1 m; 82 dB @ 1 W / 1 m
Frequency response: 100 Hz – 22,000 Hz
T/S parameters (midbass): Fs 113 Hz, Qms 4.97, Qes 1.05, Qts 0.87, Vas 0.8 l, Cms 272 µm/N, Bl 3.9 Tm, Sd 45 cm², Mms 7.2 g, Rms 1.04 kg/s
Max. linear excursion (Xmax): ±2.5 mm

Crossover

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

Installation Notes

Outer diameter: 99.2 mm / 3.91″
Installation diameter: 89.5 mm / 3.52″
Installation depth: 48.9 mm / 1.93″
Compact design: intended to simplify installation in tight spaces

Technical Specifications

Power handling RMS / Max.	P	60 / 90 Watts
Frequency response		100 Hz – 22,000 Hz
Impedance	Z	3 Ω
Sensitivity	SPL	86 dB @ 2.83V / 1m 82 dB @ 1W / 1m
Outer diameter	ø	99.2 mm / 3.91”
Installation diameter	ø	89.5 mm / 3.52”
Installation depth		48.9 mm / 1.93”

Midrange
Impedance	Z	3 Ω
DC resistance	Re	3.0 Ω
Resonance frequency	Fs	113 Hz
Mechanical Q factor	Qms	4.97
Electrical Q factor	Qes	1.05
Total Q factor	Qts	0.87
Compliance	Cms	272 μm/N
Equivalent air volume	Vas	0.8 L
Force factor	Bl*	3.9 Tm
Cone area	Sd	45 cm²
Moving mass	Mms	7.2 g
Mechanical resistance	Rms	1.04 kg/s
Voice coil diameter	ø	25 mm
Voice coil winding height		8.9 mm
Max. linear excursion	Xmax	+/- 2.5 mm

Tweeter
Voice coil diameter	ø	20 mm

Features
Tweeter		Silk dome and neodymium magnet
Midbass		Injected polypropylene cone
Crossover		Integrated, 6 dB highpass

Scope of Delivery

2 x CB C100.2-S3
1 x Mounting material

82 dB

Helix CB C100.2-S3

Ground Zero GZ ULTRA T-30