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Focal K2 Power™ 33 KX

13" subwoofer with dual 2-ohm voice coils

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  • Focal K2 Power™ 33 KX

  • Focal K2 Power™ 33 KX

  • Focal K2 Power™ 33 KX

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Our take on the Focal K2 Power™ 33 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.

Read more

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 a layer of Aramid fiber on the front and a glass layer on the back side. 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 33 KX 13" subwoofer up to 400 watts RMS without fear. This sub produces bass that's highly accurate and plenty forceful, and its dual voice coils provide multiple 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. Most 2-channel car amplifiers are stable down to 2 ohms in standard mode, or 4 ohms in bridged operation. Most mono amps are stable down to 2 ohms.

To drive this single subwoofer, we recommend a mono amplifier rated between 300 and 600 watts RMS at 4 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

Highlights:

  • 13" subwoofer with dual 2-ohm voice coils
  • Aramid fiber/foam/glass composite sandwich cone with butyl rubber surround
  • multiferrite magnet for precise motor structure linearity
  • zamak (zinc alloy) basket
  • power range: 50-400 watts RMS (200 watts per voice coil)
  • peak power handling: 800 watts
  • frequency response: 30-1,000 Hz
  • sensitivity: 84.24 dB
  • top-mount depth: 6-3/8"
  • sealed box volume: 1.06-1.77 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 13 -inch
Impedance 2 ohms
Cone Material Kevlar/foam/glass
Surround Material Butyl rubber
Ideal Sealed Box Volume (cubic feet) 1.41
Ideal Ported Box Volume (cubic feet) N/A
Port diameter (inches) N/A
Port length (inches) N/A
Free-Air No
Dual Voice Coil Yes
Sensitivity 90 dB at 2.83 watts
84.24 dB at 1 watt
Frequency Response 30 - 1000 Hz
RMS Power Range (Watts) 50-400
Peak Power Handling (Watts) 800
Top Mount Depth (inches) 6 3/8
Bottom Mount Depth (inches) N/A
Cutout Diameter or Length (inches) 11 5/16
Vas (liters) 24.59
Fs (Hz) 39
Qts 0.733
Xmax (millimeters) 11
Parts Warranty 1 Year
Labor Warranty 1 Year
Product Research
What's in the box?

Download owner's manual

  • 13" DVC 2-ohm woofer
  • 8 Hex-head mounting bolts
  • 8 Nuts
  • Self-adhesive foam gasket
  • Cloth cover (for magnet)
  • User/Warranty Manual (Eng/Fre)
  • Serial number card
  • FOCAL logo sticker
  • 2 "Remove Before Using" notes (attached to speaker terminals of woofer)

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

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 33KX features a composite sandwich membrane/cone comprising of Kevlar, foam, and a Kevlar material structure that is rigid, yet light weight, and allows fast bass response without distortion. This cone structure features a thermoformed, structural foam central core, coated with an Aramid fiber layer on the front side and a glass layer on the back side. This hybrid technology significantly improves membrane rigidity without raising the weight and allows long coil, distortion free bass even at high levels. This composite sandwich membrane/cone design offers an extremely rigid structure, improves power handling (400 watts RMS/800 watts Peak), and has low distortion characteristics.

NBR Surround: The FOCAL K2 Power 33KX features a long-throw NBR (Nitrile Butyl Rubber) surround for long excursion, deep bass (30-1000Hz), and added durability to promote long life.

Copper Voice Coil: The FOCAL K2 Power 33KX features an edge-wound copper, 4 layer/2.6", dual 2-ohm voice coil on a Kapton former (aluminum) for high power handling, bass without distortion and impedance flexibility to allow an optimized connection with the amplifier.

Dual 2-ohm Voice Coils: This woofer features dual 2-ohm voice coils that offer flexibility in wiring. When the voice coils are wired in parallel with each other, the woofer presents a 1-ohm mono load. When the voice coils are wired in series with each other, the woofer presents an 4-ohm mono load. In addition, each coil may be connected to a different amplifier channel and each channel will see a 2-ohm load.

High-Performance Spider: The K2 Power 33KX features a high-performance spider with integrated braids to form one complete layer. This spider configuration eliminates wire fatigue, as well as wear-and-tear on the wire.

Multi-Ferrite Magnets: The K2 Power 33KX woofer 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 (90db), higher power handling capabilities, and natural cooling of the woofer's voice coil.

Die Cast (Zamak) Vented Basket: The FOCAL K2 Power 33KX 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 and optimized reliability and performance consistency.

Spring-Posts: The FOCAL 13" woofer is equipped with a pair of nickel-plated spring-post speaker terminals for easy connection up to 10AWG wire.

Foam Gasket: The K2 Power 33KX comes supplied with a self-adhesive foam gasket mounting-ring for better chassis damping and to prevent air leakage.

Removable Cloth Cover: The K2 Power 33KX 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 once the woofer is installed. The cloth cover is not designed to be placed on the woofer after it has been installed.

Enclosure Compatibility

Recommended Sealed Box Volume: The FOCAL K2 Power 33KX is designed to be installed in a sealed box with a volume between 1.06 cu/ft to 1.77 cu/ft. FOCAL recommends a sealed enclosure made out of 3/4" MDF with an internal volume of 1.41 cu/ft.

Sealed Enclosure Specifications (using 3/4" MDF construction)

Internal Volume 1.06 c/ft. 1.41 cu/ft. 1.77 cu/ft.
Dimensions Width: 14.9375"
Height: 14.5625"
Depth1: 14.5625"
Depth2: 9.3125"
Width: 19.25"
Height: 14.5625
Depth1: 14.5625"
Depth2: 9.3125"
Width: 23.8125"
Height: 14.5625"
Depth1: 14.5625"
Depth2: 9.3125"
Bass Type fast and tight bass Punch and dynamic bass Deep and articulate bass
 

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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Focal K2 Power™ 33 KX Reviews

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5 out of 5

Great SQ

Written By Nathan.F, LA on Thursday, January 06, 2011
 
I got this sub about 2 years ago for my Holden VZ.

This sub sounds amazing, a nice rumble when tuned right.
I paired this with the Focal FP1.800 amp and have NEVER had any problems with either, just great bass, might get a second one too later...
11 out of 13 people found this helpful
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Add accessories for the Focal K2 Power™ 33 KX

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

T-Spec 16-gauge Speaker Wire Black/white jacket — priced per foot
13 people say
Your Price: $0.69
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T-Spec 12-gauge Speaker Wire Black/white jacket — priced per foot
29 people say
Your Price: $1.99
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Stinger PRO Series Speaker Wire Priced per foot (16 Gauge)
50 people say
Your Price: $0.39
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Dynamat 19100 License Frame Kit
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Your Price: $14.99
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Dynamat Xtreme Wedge Pack 1 sheet, 4 square feet
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Your Price: $39.99
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Dynamat SuperLite Tri-Pak Triple package — 3 sheets, 12 square feet (Model #10612)
17 people say
Your Price: $69.99
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Dynamat Xtreme Trunk Kit 5 sheets, 20 square feet
13 people say
Your Price: $169.99
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Dynamat Dynaliner One 54" x 32" sheet (1/8" thick)
6 people say
Your Price: $69.99
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Polyester Fiber Stuffing Make your subwoofer think it's in a bigger box (1-pound pack)
35 people say
Your Price: $12.99
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Metra Speaker Terminal Round terminal cup with binding post connectors (for do-it-yourself box builders)
13 people say
Your Price: $9.99
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Metra Box Carpet Carpet roll (54" x 5 yards) — available in 3 colors (Black)
24 people say
Your Price: $39.99
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5 people say
Your Price: $9.99
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Metra Speaker Terminal Round terminal cup with spring clip connectors (for do-it-yourself box builders)
6 people say
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4 people say
Your Price: $5.99
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Metra Speaker Terminal Square terminal cup with binding post connectors (for do-it-yourself box builders)
7 people say
Your Price: $9.99
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2 people say
Your Price: $9.99
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Metra Speaker Terminal Square terminal cup with spring clip connectors (for do-it-yourself box builders)
7 people say
Your Price: $3.99
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For a more in-depth review and enhanced detailed information on the Focal K2 Power™ 33 KX, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_09133KX/Focal-K2-Power-33-KX.html ).