Helix Pure F-Series PF K100.2 4 inch 2-Way Component Speakers 40w RMS

The Helix Pure F-Series PF K100.2 is a 4 inch (100 mm) 2-way component speaker set rated at 40 W RMS / 80 W max, using 3 ohm technology to extract more output from your amplifier. It is part of Helix's entry-level Pure F-Series range.

This set pairs a 20 mm silk dome tweeter and a 4 inch (100 mm) woofer with a two-part Flex-Crossover, allowing the tweeter to be mounted in the A-pillar or dash and the woofer in the door. Other sizes in the Pure F-Series component range include the PF K130.2 (5.25 inch, 50 W RMS) and PF K165.2 (6.5 inch, 60 W RMS). Prefer a single-unit speaker? See the HELIX PF C100.2 coaxial version.

Key specifications

• Type: 2-way component speaker set
• Woofer size: 4 inch (100 mm)
• Tweeter: 0.75" / 20 mm silk dome, neodymium magnet
• Power RMS / max: 40 / 80 W
• Impedance: 3 ohms
• Frequency response: 100 Hz to 22,000 Hz
• Sensitivity: 90 dB @ 2.83 V / 1 m (86 dB @ 1 W / 1 m)
• Crossover: two-part Flex-Crossover, 12 dB tweeter / 6 dB woofer slopes with tweeter protection
• Woofer installation depth: 45 mm (cut-out 93 mm)

The entry into the HELIX sound world

The Pure F-Series is Helix's entry point into their speaker range. The 3 ohm technology maximises power draw from your amplifier, delivering powerful bass, clear mids and detailed highs.

Features

• High sound quality with deep bass, clear mids and detailed highs
• 3 ohm technology for high efficiency and more output from your amplifier
• Low installation depth for straightforward fitting in almost all vehicles
• Black matt cone finish with black shiny Space Line styling
• Tweeter
  • 0.75" / 20 mm silk dome tweeter with neodymium magnet for clear, detailed treble even at high levels
  • Ultra-compact design with various mounting pods to suit a wide range of installation positions
  • Removable grille for integration behind factory grilles in original mounting locations
• Woofer
  • 4" / 100 mm woofer with rigid injected polypropylene cone with embedded carbon fibres for stiffness and high inner damping
  • Powerful magnet system for controlled, clear bass
  • HELIX basket with additional ventilation holes for improved voice coil cooling and power handling
• Flex-Crossover
  • Separate two-part crossover for versatile connection options — well suited where tweeter and woofer are in separate mounting positions
  • Finely tuned crossover with 12 dB slope for the tweeter and 6 dB for the woofer
  • 2-stage tweeter level adjustment with integrated tweeter protection

Easiest integration at its best

The Pure F-Series is designed with installation in mind. The low installation depth suits the limited space in modern vehicles, and the system includes an extensive range of installation accessories. The tweeter uses an innovative bayonet lock for flexible, compact mounting, and the Flex-Crossover simplifies wiring where tweeter and woofer are in separate locations.

Maximum flexibility — the Flex-Crossover

The two-part Flex-Crossover is designed to save space and maximise installation flexibility — particularly useful when the tweeter is in the A-pillar and the woofer in the door. The tweeter crossover includes a two-stage level adjustment to suit both personal preference and the specifics of your installation.

Cool design — noble materials

The Space Line styling of the woofer cone is the result of high-quality material choices rather than aesthetics alone. Carbon fibres embedded in the polypropylene cone optimise midrange reproduction, while the coated silk dome tweeter delivers airy, detailed highs.