Helix Compose Basic CB K100.2-S3 FlexMount Speaker Kit 4 Inch 10cm 60w RMS Pair

The Helix CB K100.2-S3 is a 4 inch (100 mm) two-way component speaker kit from the Helix Compose Basic range, rated at 60W RMS with 3 ohm impedance. It comprises a polypropylene cone midrange, a 20 mm coated silk dome tweeter, and separate crossovers, supplied as a pair.

This listing is the 4 inch kit. The Compose Basic range is also available in a CB K130.2-S3 5.25 inch kit and a CB K165.2-S3 6.5 inch kit.

Key specifications

• Type: 2-way component speaker kit, supplied as a pair
• Midrange: 4 inch / 100 mm, lightweight polypropylene cone, steel basket
• Tweeter: 0.75 inch / 20 mm coated silk dome, neodymium magnet
• Power handling: 60W RMS
• Impedance: 3 ohm
• Crossover: separate, 4-stage tweeter level adjustment, integrated tweeter protection, 12 dB slope for tweeter
• Tweeter mounting: flush and angle-mount pods included; FlexMount20 adaptors optional

4 inch / 100 mm speaker kit with 3 ohm impedance and FlexMount20 silk dome tweeter

The CB K100.2-S3 pairs a 4 inch / 100 mm, 3 ohm midrange with a coated silk dome tweeter compatible with optional FlexMount20 adaptor rings for vehicle-specific installation positions.

Helix Compose — universal speakers evolved

The Helix Compose platform was designed to combine the flexibility of universal speakers with the acoustic benefits of vehicle-specific fitment. Smart engineering, modern materials and tight integration with Helix and Match amplifiers sit at the core of every Compose product.

The essentials for an exceptional sound experience

The Compose Basic series is the entry point into the Compose platform. All components work together as a matched system and are optimised to partner with Helix and Match amplifiers for consistent performance. The Basic tweeter uses secure connection engineering focused on safety and straightforward professional installation.

High efficiency

Compose Basic uses 3 ohm technology throughout, which is tuned to work with Helix and Match amplifiers and delivers a meaningful gain in efficiency and maximum sound pressure over conventional 4 ohm designs.

Powerful bass — always on point

The bass-midrange driver uses a lightweight polypropylene diaphragm for strong sound performance. The steel basket includes additional ventilation holes for improved cooling, and a powerful magnet system ensures accurate impulse response. A soft polyurethane dustcap optimises frequency response in the upper midrange, and the compact dimensions suit tight installation spaces.

High frequency reproduction with unique dynamics

The Basic tweeter uses a coated silk dome and a neodymium magnet to deliver dynamic, clear high-frequency reproduction. The separate crossover provides a 12 dB slope for the tweeter, integrated tweeter protection, and 4-stage level adjustment to fine-tune output to your vehicle.

FlexMount20 — universal meets car-specific

FlexMount is a mounting system using purpose-designed adaptor rings. The optional FlexMount20 adaptor ring allows the CB K100.2-S3 tweeter to be fitted in the vehicle's original tweeter location, giving a clean, acoustically optimised installation without cutting new holes. If you want a step up in the Compose family, the Helix Compose i3 Ci3 K100.2FM-S3 offers a 4 inch FlexMount component kit rated at 80W RMS.