Helix Pure S 42C.2 4 Inch 100mm 2-Way Component Speakers 70w RMS

The Helix Pure S 42C.2 is a 4 inch (100 mm) 2-way component speaker set rated at 70 W RMS, featuring a basalt-fibre-paper woofer, a 25 mm silk dome tweeter in an aluminium housing, and a separable Flex-Crossover. It belongs to the Helix Pure S range and suits sound-quality upgrades in cars with 4 inch door or dash locations.

Key specifications

• Type: 2-way component speaker set
• Woofer: 4" / 100 mm basalt-fibre-paper compound cone
• Tweeter: 1" / 25 mm coated silk dome
• Power RMS / max: 70 / 140 W
• Impedance: 4 ohms
• Frequency response: 75 Hz to 25,000 Hz
• Sensitivity: 89 dB @ 1 W / 1 m
• Crossover: Flex-Crossover, 12/12 dB with bandstop filter and 3-stage tweeter level adjustment
• Woofer installation depth: 46.5 mm (cut-out 92.3 mm)

Highest sound quality

The S-series delivers rich bass, accurate mids and crystal-clear highs. Sophisticated design and up-to-date technologies give the S 42C.2 excellent sound characteristics across the frequency range.

Features

• 4" / 100 mm woofer with basalt-fibre-paper compound cone — low weight, high stiffness and effective inner damping
• 1" / 25 mm silk dome tweeter in an aluminium housing for balanced, natural sound reproduction and low compression
• Individual Helix basket with additional ventilation holes for better voice coil cooling and high power handling
• Flex-Crossover with 12/12 dB slope, bandstop filter and three-stage tweeter level adjustment — separable for installations where the tweeter and woofer are mounted in separate locations
• Crossover components include low-distortion air-core coils and minimum-loss Audiotec-foil capacitors

Classy design

The S 42C.2 pairs its sound performance with a clean, timeless look. The transparent Flex-Crossover with its high-grade components and the aluminium tweeter housing both contribute to the premium finish.

Easy integration

Low installation depths, a removable tweeter housing and the compact Flex-Crossover give more freedom during fitting — even in tight spaces. Plug & Play connections between components keep cabling straightforward.

Maximum flexibility — Flex-Crossover

The Flex-Crossover can be installed without its housing using the supplied foam, reducing its footprint significantly. It also splits into two parts for separate installation — for example, tweeter in the A-pillar and woofer in the door. Alongside the 3-stage tweeter level adjustment and Plug & Play connections, screw terminals are included for use with your own speaker cables.