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Focal Utopia Be® 21 WX

8" 4-ohm subwoofer

Item #: 09121WX

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Focal's top-of-the-line Utopia Be speakers exemplify Focal's dedication to musical perfection. The sound enthusiasts at Focal worked without constraints to develop what they consider to be the ultimate in speaker technology. Utopia Be subwoofers employ unique materials and unparalleled construction to add incomparable dynamics and natural sound to your system.

Focal's composite sandwich "W" cone features a layer of durable structural foam between two layers of precision-coated glass — the resulting membrane demonstrates exceptional agility, rigidity, and damping to produce realistic bass notes without distortion. A supple rubber surround maintains precise control over the cone, even during extreme excursion. A massive multi-element magnet, high-linearity voice coil, and zinc alloy basket give the sub rock-solid power and strength.

The Utopia Be 21 WX 8" subwoofer represents the pinnacle of Focal's pursuit of perfect-sounding, full-bodied bass. It handles up to 250 watts RMS and works best in compact sealed enclosures. Utopia is defined as an "ideal place or state," and these hand-crafted Focal subs let you take your music to that level.

To drive this single subwoofer, we recommend a mono amplifier rated between 200 and 375 watts RMS at 4 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

Priced per speaker

Product Highlights:

  • 8" 4-ohm subwoofer
  • "W" structured foam and glass composite sandwich cone with rubber surround
  • zamak (zinc alloy) basket
  • multiferrite magnet
  • power handling: 50-250 watts RMS (500 watts peak power)
  • frequency response: 29-500 Hz
  • sensitivity: 82.63 dB
  • top-mount depth: 4-3/16"
  • sealed box volume: 0.52-1.06 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.

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Hands-on research

What's in the box?

Download owner's manual

  • One 8" Single voice coil 4-ohm woofer
  • Six 7/8" Hex-head mounting screws
  • Grille
  • Adhesive backed foam gasket
  • User manual
  • FOCAL logo sticker

Product Research

Enclosure Compatibility


"W" Composite Sandwich Cone Woofer: The Focal 21 WX Be 8" subwoofer features a "W" composite sandwich cone woofer. The rigidity of the glass layers delivers extreme linearity over a wide frequency range without and low frequency distortion. The structural foam central core's lightness allows optimal acceleration, without delay, while damping derived from the "W" material produces a neutral, coloration free sound.

Rubber Surround: The long-throw rubber surround provides long excursion, deep bass (29-500Hz), and added durability to promote long life.

Multi-Ferrite Magnets: The woofer utilizes six double-stacked Ferrite magnets (12 total) to create a powerful magnetic field to help suppress compression and offer better power handling. The Multi-Ferrite motor assembly also aids the natural cooling of the woofer's voice coil.

Die Cast (Zamak) Vented Basket: The 21 WX Be features a vented die-cast Zamak basket which is a rigid, non-magnetic, and non-resonant frame that provides a strong, reliable structure for the woofer. The vented basket provides a self-regulated coil cooling system which allows air to flow freely, preventing heat build-up.

Spring Posts: The wiring terminals are spring posts which accommodate pin connectors, single banana plugs, dual banana plugs (standard 3/4" width) or bare speaker wire up to 10 gauge.

Enclosure Compatibility

Sealed Enclosure: The two sealed enclosure volumes Focal recommends are 15 liters (0.53 ft³, resulting in a -3dB point of 45 Hz) and 30 liters (1.06 ft³, resulting in a -3dB point of 43 Hz).

Ported Enclosure: The Focal recommends a ported enclosure of 30 liters (1.06 ft³) with a 2" diameter x 5-1/4" long port tube, resulting in a tuning frequency of 34 Hz and a -3dB point of 29 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?