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Focal K2 Power 40 KX

16" subwoofer with dual 2-ohm voice coils

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  • Focal K2 Power™ 40 KX

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Our take on the Focal K2 Power™ 40 KX

by Dominic Devito
Focal

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.

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 zamak zinc alloy 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 butyl rubber 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 K2 Power 40 KX 16" subwoofer up to 500 watts RMS without fear. This sub produces bass that's highly accurate and plenty forceful, and its dual 2-ohm voice coils provide plenty of wiring options for your system. 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.

Note: If you are wiring this DVC sub for lower impedance, make sure that your amp is compatible.

See more info on this item

Highlights:

  • 16" subwoofer with dual 2-ohm voice coils
  • Kevlar/foam sandwich cone with butyl rubber surround
  • multiferrite magnet for precise motor structure linearity
  • zamak (zinc alloy) basket
  • power range: 50-500 watts RMS (250 watts per voice coil)
  • peak power handling: 1,000 watts
  • frequency response: 25-1,000 Hz
  • sensitivity: 86.26 dB
  • top-mount depth: 7-7/16"
  • sealed box volume: 1.41-2.82 cubic feet
  • warranty: 1 year
  • Our 60-day money-back guarantee

Priced per speaker

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Size
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16 -inch
Impedance
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2 ohms
Cone Material
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Kevlar/Foam
Surround Material
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Butyl rubber
Ideal Sealed Box Volume (cubic feet)
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N/A
Ideal Ported Box Volume (cubic feet)
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N/A
Port diameter (inches)
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N/A
Port length (inches)
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N/A
Free-Air
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No
Dual Voice Coil
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Yes
Sensitivity
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92.5 dB at 2.83 watts
86.26 dB at 1 watt
Frequency Response
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25 - 1000 Hz
RMS Power Range (Watts)
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50-500
Peak Power Handling (Watts)
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1000
Top Mount Depth (inches)
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7 7/16
Bottom Mount Depth (inches)
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N/A
Cutout Diameter or Length (inches)
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13 15/16
Vas (liters)
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64.83
Fs (Hz)
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34.6
Qts
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0.82
Xmax (millimeters)
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11
Parts Warranty
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1 Year
Labor Warranty
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1 Year
Product Research
What's in the box?

Download owner's manual

  • One 16" Dual 2-ohm voice coil woofer
  • 8 Hex-head mounting bolts
  • 8 Spiked T-Nuts
  • Self-adhesive foam gasket
  • Cloth cover (for magnet)
  • Manual (English/ French)
  • Serial number card
  • FOCAL logo sticker

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 open the box, verify contents, 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.

Features
Enclosure Compatibility

Features

K2 Composite Sandwich Membrane/Cone: The FOCAL K2 Power 40KX 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.

NBR Surround: The 40KX features a long-throw NBR (Nitrile Butyl Rubber) surround for long excursion, deep bass (25-1000 Hz), and added durability to promote long life.

Copper Voice Coil: The dual 2-ohm voice coils are 4 layer, 2.55" diameter, edge-wound copper on an aluminum former, resulting in high power handling, low distortion, and impedance flexibility to allow an optimized connection to the amplifier.

Dual 2-ohm Voice Coils: This woofer features two 2-ohm voice coils that offer wiring flexibility. When the voice coils are wired in parallel, the woofer presents a 1-ohm load. When the voice coils are wired in series, the woofer presents a 4-ohm load.

High-Performance Spider: The 40KX features a high-performance spider with the tinsel leads sandwiched between the two layers to eliminate wire fatigue.

Multi-Ferrite Magnets: The 40KX utilizes six triple-stacked Ferrite magnets (18 total) to create a powerful magnetic field to help suppress compression and give better power handling. This Multi-Ferrite motor assembly allows for greater efficiency (92.5 dB), higher power handling capabilities, and natural cooling of the woofer's voice coil.

Die Cast Zamak Basket: The vented die-cast Zamak basket is rigid, non-magnetic, and non-resonant. The vented basket provides a self-regulated coil cooling system, allowing air to flow freely to prevent heat build-up.

Spring-Posts: The woofer features two 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.

Removable Cloth Cover: The K2 Power 40KX woofer comes with a cloth cover to protect the magnet from scratches or smudging during transport, handling, and installation. The cloth cover should be removed when the woofer is installed.

Enclosure Compatibility

Sealed Box Volume: The 40KX is designed to be installed in a sealed box with a volume between 1.4 ft³ and 2.82 ft³. FOCAL highlights three specific sealed enclosures in the manual:

  • 1.41 ft³: Fast and tight bass, -3dB frequency of 41 Hz
  • 2.19 ft³: Punchy and dynamic bass, -3dB frequency of 37 Hz
  • 2.82 ft³: Deep and articulate bass, -3dB frequency of 36 Hz
 

Product reviews from the Crutchfield Labs (what are the Labs?)

Video: Introduction to Focal Car Audio

Video: Introduction to Focal Car Audio

by Zak Billmeier, Ken Nail
 
Video: Introduction to Focal Car Audio

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.

 
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Add accessories for the Focal K2 Power™ 40 KX

It's critical to have good wire, and none is included with the sub. See all categories & accessories

T-Spec 12-gauge Speaker Wire Black/white jacket — priced per foot
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T-Spec 16-gauge Speaker Wire Black/white jacket — priced per foot
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Stinger PRO Series 16-gauge Speaker Wire Black jacket — priced per foot
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Dynamat Xtreme Trunk Kit 5 sheets, 20 square feet
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Dynamat SuperLite Tri-Pak Triple package — 3 sheets, 12 square feet (Model #10612)
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Dynamat Xtreme Wedge Pack 1 sheet, 4 square feet
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Dynamat Dynaliner One 54" x 32" sheet (1/8" thick)
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Dynamat 19100 License Frame Kit
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Polyester Fiber Stuffing Make your subwoofer think it's in a bigger box (1-pound pack)
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Metra Speaker Terminal Round terminal cup with binding post connectors (for do-it-yourself box builders)
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Metra Speaker Terminal Square terminal cup with binding post connectors (for do-it-yourself box builders)
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Metra Speaker Terminal Round terminal cup with spring clip connectors (for do-it-yourself box builders)
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Metra Box Carpet Carpet roll (54" x 5 yards) — available in 3 colors (Charcoal)
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Metra Speaker Terminal Square terminal cup with spring clip connectors (for do-it-yourself box builders)
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Autosound 2000 Disc One Low Frequency Test CD (Disc One)
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For a more in-depth review and enhanced detailed information on the Focal K2 Power™ 40 KX, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_09140KX/Focal-K2-Power-40-KX.html ).