The CB C87.2-S3 is the 3.4″ / 87 mm 2-way coaxial speaker from Helix’s Compose Basic range, the entry point to the Compose family and part of the platform that won the EISA Best Product award for in-car integration (2023-2024). Each speaker has the tweeter mounted in front of the midrange cone with a crossover built in, so it’s a straight swap into a factory 3.4″ location. Sold as a pair.

Power handling is 40 W RMS (60 W max), and it runs at 3 Ohms, which lets a Helix or Match amplifier deliver more of its power and gives a clear gain in efficiency and maximum volume. Sensitivity is 88 dB at 2.83 V, and it covers 110 Hz to 22,000 Hz.

The midrange uses a light but stiff injected polypropylene cone in a steel basket with extra ventilation holes for voice coil cooling, with a compact 42.0 mm mounting depth for tight spaces. The 0.5″ / 13 mm tweeter pairs a light PEI dome with a neodymium magnet for detailed, dynamic highs, and the built-in crossover has a 6 dB slope.