Skip Navigation

This sub's name gets straight to the point — the Focal K2 Power subwoofer delivers hard-hitting low end that combines realistic reproduction with competition-level sound pressure. Precision engineering and hand-assembled construction make this sub a sound choice for a high-performance bass system.

Powerful magnet
A massive multi-element magnet provides the backbone for the sub's powerful reputation — its circular array provides a uniform field across the entire width of the sub, driving the motor assembly with unerring precision. Focal anchors the K2 Power sub with a rugged aluminum basket for dependable performance that won't get bent out of shape by your music.

3-layer cone
At the top end of the sub, a high-density foam surround maintains control of the cone, even during deep excursion. Focal's unique composite sandwich cone employs a structural foam central core coated with layers of Kevlar on the front and back sides. The three layers together form an incredibly rigid yet lightweight membrane for high-quality sound reproduction with the added emphasis of thunderous sound pressure.

Assembled and inspected by hand
You can feed the efficient K2 Power 46 KX 4 18" subwoofer up to 1,000 watts RMS without fear. This behemoth works with a ported enclosure to produce powerful, accurate bass, and its four 1-ohm voice coils allow you to get creative with your wiring setup. Focal assembles each sub by hand and rigorously inspects them for any flaws to ensure your investment performs to the high sound standards they've set.

Product Highlights:

  • 18" subwoofer with quadruple 1-ohm voice coils
  • Kevlar/foam sandwich cone with high-density foam surround
  • multiferrite magnet for precise motor structure linearity
  • aluminum basket
  • power range: 100-1,000 watts RMS (250 watts per voice coil)
  • peak power handling: 2,000 watts
  • frequency response: 20-500 Hz
  • sensitivity: 93.35 dB
  • top-mount depth: 7-3/4"
  • ported box volume: 2.82-4.24 cubic feet
  • warranty: 1 year
  • Our 60-day money-back guarantee

What's a component sub and why would I want one?

A component sub is simply a speaker that's designed to reproduce bass once it's installed in a compatible enclosure. Think about the impact of a movie soundtrack in a big theater or even in your own home HDTV setup. A component sub can add the same kind of power to the music in your car. And a car sub is not all about the boom that you hear on a street corner (although that's cool too) - you can pair a component sub with your choice of enclosure to get bass just the way you like it, from tight and punchy to fat and loose. And once you experience music in your car with a well-tuned subwoofer, you'll never go back.

Focal K2 Power™ 46 KX 4 Reviews

Hands-on research

What's in the box?

Download owner's manual

  • One 18" Woofer with four 1-ohm voice coils
  • Cloth cover (for magnet)
  • Manual (English/ French)
  • Serial number card
  • FOCAL logo sticker

Product Research

Enclosure Compatibility


K2 Composite Sandwich Membrane/Cone: The FOCAL K2 Power 46 KX 4 features a composite sandwich membrane/cone comprised of a foam layer, sandwiched between two Kevlar layers. The result is a material structure that is rigid, yet light weight, and allows fast bass response without distortion.

Voice Coils: The four 1-ohm voice coils are 8 layer, 3" diameter, copper windings on an aluminum former, resulting in high power handling, low distortion, and impedance flexibility. When the voice coils are wired in parallel, the woofer presents a 1/4-ohm load. When the voice coils are wired in series, the woofer presents a 4-ohm load.

High-Performance Spider: The 46 KX 4 features a high-performance spider with the tinsel leads sandwiched between the two layers to eliminate wire fatigue.

Spring-Posts: The woofer features four sets of nickel-plated spring-post speaker terminals that will accept pin connectors, dual and single banana plugs, and bare wire up to 8-gauge.

Enclosure Compatibility

Ported Box Volume: The 46 KX 4 is designed to be installed in a ported box with a volume between 2.82 ft³ and 4.24 ft³. FOCAL highlights three specific enclosures in the manual:

  • 2.82 ft³: Fast and tight bass, -3dB frequency of 45 Hz
  • 3.53 ft³: Punchy and dynamic bass, -3dB frequency of 40 Hz
  • 4.24 ft³: Deep and articulate bass, -3dB frequency of 37 Hz

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Product reviews from the Crutchfield Labs

Video: Introduction to Focal car audio
by Zak Billmeier, Ken Nail

Crutchfield's car audio experts Ken and Zak present an overview of Focal car audio products. Focal is a leading name in high-quality sound and Crutchfield is proud to have them in our lineup.

What are the Labs?