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Infinity Kappa 63.9i

6-1/2" / 6-3/4" 3-way Kappa Series Coaxial Car Speakers

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List price $229.95

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$149.95

with warranty

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Arrives by Tuesday, Aug. 4 to zip 20147

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Infinity Kappa 63.9i

$149.95

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NVX Speaker Installation Kit

$34.99

Special Price $17.49 ($34.99 if purchased separately)

NVX Speaker Installation Kit

• Everything You Need for a Smooth Speaker Install
• NVX SDSK2 Sound Dampening Speaker Kit
• Two 10" x 10" Pieces
• NVX SDRLR1 Sound Dampening Rubber Roller
• Scosche TK12 Complete Car Stereo Tool Kit
• Includes Wire Stripper/Cutter, Screwdriver, RCA Cable Runner, Panel Removal Tool, Test Light, and other Installtion Accessories

(Offer 1 of 1)

Combined Total Price

$167.44

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Kappa: The Essence of Infinity

This Infinity Kappa 682.9cf is the essence and trademark of Infinity car audio. With all the high-end engineering and technology that goes into each Kappa speaker, you will sure that you are receiving only the highest quality components. Made with a woven glass fiber woofer cone, which contributes to low cone flex, low distortion, and enhanced acoustic clarity. Due to the increased power handling of the Kappa series, the Kappa 682.9cf feature edge-driven MMD dome tweeters that allow for a seamless sonic integration between the tweeter and the mid-woofer. Using the latest in loudspeaker engineering, each of the crossovers has computer optimized voice-matched outboard passive crossovers for flawless performance.

Unipivot: Staging Made Easy

The Infinity 682.9cf features a patented Unipivot tweeter design that ensures proper imaging when the speakers are installed. With the tweeter capable of being moved, it is positional and rotational even after the final screw secures the speaker in the door. Since most speakers are installed low in the door, the Unipivot design brings the soundstage up to the listener for more accurate and enjoyable experience. Each of the Kappa coaxial speakers, such as the Infinity Kappa 682.9cf feature adjustable tweeter level control. This switch will adjust the tweeters output by 3 dB. That simple tuning can make all the difference in your system and it ensures that your Kappa speakers will deliver exactly the sound that you are looking for.

True Four Ohm Technology

The engineers at Infinity have developed a speaker that works for all applications. The True Four Ohm Technology used in these speakers make it perfect for running directly of a headunit or with an aftermarket headunit and amplifier. All of the speakers in the Infinity Reference line feature a 2 ohm voice coil. However, when you factor in the small OEM speaker wire of most vehicles and the heating in the voice coil during use, the impedance actually seen by the amplifier will increase. Infinity has adjusted the speaker to be safely connected to any headunit.

General Features:

  • 6-1/2" Kappa Series Car Speakers
  • Power Handling:
    • Peak: 450 watts per pair / 225 watts each
    • RMS: 150 watts per pair / 75 watts each
  • Woven glass fiber cone woofer
  • Rubber surround
  • 1" Edge-driven MMD (Metal Matrix Diaphragm) dome tweeter
  • UHF super tweeter allows for frequency response as high as 30000 Hz
  • Computer optimized voice-matched passive crossovers with audiophile-grade air core inductors and polypropylene capacitors
  • Adjustable tweeter level (-3 dB, 0, +3 dB)
  • 2 ohms impedance
  • Top-mount depth: 2-5/16"
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Priced Per Pair

Product History:

Infinity 63.9i thumbnail
(newest, current model)
(previous model, replaced by Infinity Kappa 63.9i)

Speaker Specifications

Series
This is the manufacturer product line of speakers.
Priced Per
Car Speakers are typically sold in pairs so you will receive 2 speakers for each speaker purchase on speakers marked "Priced Per Pair". If a speaker is marked "Priced Per Each" then the speaker is sold individually and each purchase you make will result in 1 speaker. High-powered tweeters, midrange and full-range pro audio for car speakers are typically sold per each speaker.
Speaker Size
Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
6-1/2" (also mounts in 6-3/4" w/ included brackets)
Design
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
3-way
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Dome
Tweeter Size
Refers to the size of the tweeter. Typically, smaller tweeters produces less output with higher frequency response.
Tweeter Composition
Materials such as polypropylene, silk, cloth, and paper are the most common, where as many more recent tweeters are now manufactured with composites such as Aluminum, Titanium, Mylar, and other materials.

PEI is an acronym for "Polyetherimide" which is an amorphous, amber transparent, high-performance thermoplastic.

Metal Matrix Diaphragm
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Woven Glass Fiber
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Rubber
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
225 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
75 watts
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
 
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
95 dB
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
45 - 30000 Hz
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
2 ohms
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.

Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
2-5/16"
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches, required to contain the speaker.
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches or millimeters, required to contain the speaker.
4-5/16" x 4-5/16" 
Number of Speakers
This is the number of speaker that is included in the package. Each purchase will result in receiving the number of speakers indicated here. Please note that some items will have multiple woofers in the same enclosure. For sets of component speakers, this number will refer to the number of sets of speakers (For example, 2 would indicate the purchase includes 2 woofers and 2 tweeters).

Please refer to the product image and description for further details about the speaker.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
77%
4 Star
23%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
4.8
Features
4.8
Design
4.8
Usability
4.8
Joey

Anniston, Alabama

Overall
Durability
Value
Features
Design
Usability
Good sound

April 6, 2009

Good highs. Looks great. More bass than you would expect with a shallow design. Shallow design makes it easier to mount and it also comes with nice mounting options.

23 of 40 found this helpful

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Rael

Oklahoma City, OK

Overall
Durability
Value
Features
Design
Usability
6 month review...

March 12, 2012

Replaced factory speakers with these, driven by a Pioneer GM-D9500F. I've had several audiophiles and musicians in my car and they want me to do the same setup for them. Truly amazing sound.

21 of 38 found this helpful

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-Benjamin

Hampton, VA

Overall
Durability
Value
Features
Design
Usability
You know its not factory...

July 22, 2012

Very good speakers for the price, I dare say best, but what do you expect from Infinity/Harmon-Kardon. The crossover gets kinda difficult to manage, but at the same time makes things easier. I think I ended up either ziptieing it or sticking it down with dynamat so it wouldn't bang arround. A flaw with my system installation means sometimes when I start my car the radio turns on at full volume, and will make you jump out of your skin (think James Brown). Using the Infinty Kappa Five with the amps crossover at 320 high pass. I think if I can pad the door panels or fur them out from the speakers, then I can set it to an 80 High pass and really make my molecules move! In the doors of my 2002 Monte Carlo SS. I belive the max excursion may be too much for the mounting space and that could be the cause of the bass distortion (either that or the panel needs reinforcement). There was also a mounting spot for a tweeter in the factory door speaker mount, kinda wish I peeled the panel off before making my purchase. I'd rather have components than #-way speakers. I went for the three ways rather than the 2ways and I think it was worth it. High value for dollar.

20 of 37 found this helpful

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Richard

San Diego, CA

Overall
Durability
Value
Features
Design
Usability
Unbelievable sound!!!

January 30, 2009

Great deal on a great set of speakers! Unbelievable sound!!!

21 of 39 found this helpful

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juan

Bakersfield, CA

Overall
Durability
Value
Features
Design
Usability
NICE

September 29, 2011

They are very clear. Highs are clean. With a amp they sound extremly clean.

19 of 36 found this helpful

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kj

omaha, NE

Overall
Durability
Value
Features
Design
Usability
kappa 63.9i

February 14, 2013

Easy to install and comes with hardware, grills mounting brackets for different sized openings and instructions. Kappas sound great at a great price.

19 of 37 found this helpful

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SNUKIE

San Antonio,TEXAS

Overall
Durability
Value
Features
Design
Usability
awesome deal

August 8, 2012

Great crisp sound but even better deal. Would've paid double the price.

22 of 43 found this helpful

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BigNasty

Albuquerque, NM

Overall
Durability
Value
Features
Design
Usability
Bliss!!

September 16, 2009

This is a wonderful speaker. I currently have a pair mounted in the doors of my 08 Tundra powered by a Soundstream Tarantula 4-channel amp. The highs are very clean and detailed. The bass is good, however I would recommend a sub for lower frequencies. Infinity did a good job with this one. I highly recommend them!!!!

19 of 37 found this helpful

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Mike

Greenwood, In

Overall
Durability
Value
Features
Design
Usability
Buy

December 20, 2008

Great sound quality, great price. Only problem was that the magnet was too big for my doors. I drive a 96 Mercury Tracer and in the front doors there is a brace that partially impedes on the speaker slot, had to cut some plastic and metal and drill a few new holes, but all around worth it!

21 of 41 found this helpful

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Darren

Auburn, GA

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Good Sound

May 17, 2015

I am going to give these speakers a 5 across the board. Installed these in the front doors of my sons 2009 Mitsubishi Lancer yesterday. The back doors are pushing the Infinity Kappa 2 way speakers. All four door speakers are being pushed by the Pioneer GM-A6604. As far as sound goes, these speakers can handle a lot of power with little to no distortion. You will get distortion at very high volume levels yet with enough power that will happen to any speaker. Good bass for a 6.5 inch speaker and mids and highs are clear and crisp. Installation was fairly easy, had to modify the existing factory speaker housing so these speakers could be used.
Overall good product for the cost!

9 of 18 found this helpful

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Stefan

Naples, FL

Overall
Durability
Value
Features
Design
Usability
Kappa ya Papa

August 13, 2008

trust me i have a pair of the previous model and they are just excellent! At high volumes you can still hear every word clearly. I have all the bass filtered to my subs though they can pound if insist on using them for bass. Excellent brand for a phenominal price!

20 of 40 found this helpful

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kyle

Northampton, PA

Overall
Durability
Value
Features
Design
Usability
Just awesome

October 18, 2013

Put these in the back of my 2001 Daewoo lanos they sound amazing. the sound is crisp clear and loud. cant even hear my front speakers.

18 of 37 found this helpful

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Andrew

CT

Overall
Durability
Value
Features
Design
Usability
Fantastic

January 23, 2013

I bought 2 pairs of these speakers too install in my 2000 Jetta as my first upgraded sound system. It was super easy and fast considering i did it myself. They sound FANTASTIC, better than my friends 50,000$ Audi. Unfortunately the front door speaker blew the first day. But it was my fault because I had the music way too loud. But i just called Harman and they replaced it quickly and without question. HIGHLY recommended as upgrade.

However if you want to get the best out of these speakers you will need an amp. I just installed an infinity 4 channel amp and the difference is astronomical. Buy these.

20 of 41 found this helpful

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Joshua

Woodstock, GA

Overall
Durability
Value
Features
Design
Usability
Infinity Kappa 63.9i Best Speaker Upgrade or Replacment

January 4, 2012

I purchased two sets (4) of these for my 2011 Kia Sorento and I have not been disappointed. I hear things in my music that I have never heard before. These speakers are the best three ways I have owned to date. I have a Crunch amp (PZA1200.4) pushing these and my stock tweets and it can blow my ear drums out if I turn it past 15 on my headunit. I will buy other infinity products as these are the best.

15 of 31 found this helpful

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bryce

arlington texas

Overall
Durability
Value
Features
Design
Usability
best speaker on the market!!

December 11, 2011

I have owned just about every brand of speaker and by far these are the best! Amazing highs and mids! They made my system extremely balanced.

19 of 39 found this helpful

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Dan

Buffalo, New York

Overall
Durability
Value
Features
Design
Usability
Great Product for the price!

October 6, 2011

I bought these speakers to replace the front's in my car in the door. They sounded real nice when I had them in. I had problems mounting them in my doors as the tweeter piece was sticking out hitting the plastic trim and wouldn't allow the door panel to go on all the way. I found out after i removed them and gave them to a friend, I have to make my own bracket for the speakers to sit in since my car's stock speakers are molded to the bracket. I replaced them back with the stock speakers.

While I had them in the doors, they sounded crisp and loud. I didn't get any distortion coming from these speakers, i did not have them amped. The bass was great as well with the high end.

17 of 35 found this helpful

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patrick

jacksonville, NC

Overall
Durability
Value
Features
Design
Usability
sounds great

March 22, 2009

I have had better speakers but these do sound good. They are clear and loud. I recommend these for the price

21 of 43 found this helpful

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Rob

Daytona Beach, FL

Overall
Durability
Value
Features
Design
Usability
Solid Performance

September 23, 2009

The only complaint I had at first is that they didn't perform too well in the doors with all the free air space, bass was fluttery and highs were harsh. As soon as I put them in a custom kick-panel the bass was clean and tight, and I set the tweeter crossover for -3db. They sound fantastic.
As for the design, the materials and craftsmanship seem good. The cone is properly glued to the chassis (which I've had problems with JL and MB Quart coming apart) and the chassis itself is pretty beefy.

In the box you're supplied with a mounting bracket that allows the speakers to fit most, if not all, factory 6.5 locations. Don't bother with the supplied wiring whatsoever if you plan on using an external amp, get yourself some nice 12-14 gauge wire.

If you're strapped for space, consider the 63.9is model, (s) standing for shallow. For the price, its hard to beat.

16 of 35 found this helpful

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Michael

San Bernardino, CA

Overall
Durability
Value
Features
Design
Usability
great product!

March 4, 2009

These speakers are great for the price! They sound crystal clear when i turn it up, with no distortion at all. I have been using these speakers for about 6 months now. Using a 120rms amp to power these and they still sound as if i just bought them. You wont regret this product.

19 of 41 found this helpful

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Nick

sonora CA

Overall
Durability
Value
Features
Design
Usability
Great buy

March 14, 2012

I recommend this to any one that wants a good 2 ohm speaker. I have four of these running on a Rockford Fosgate T-400 and they sound great evan past the rated 75 watts RMS.

19 of 42 found this helpful

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SiN

Bermuda

Overall
Durability
Value
Features
Design
Usability
Very Good

July 28, 2009

These speakers are very good and they have very clear sound. I like the fact that they included adapters because I have a peugeot 207 which is a french car and they helped me mount my speakers perfectly

18 of 40 found this helpful

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Paul

White Hall, MD

Overall
Durability
Value
Features
Design
Usability
outstanding speakers

July 29, 2012

I installed them on my Harley FLHT. At 70 mph I can fire them up and they are loud and clear. So far they have preformed flawlessly.

13 of 31 found this helpful

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Brian

Horicon, WI

Overall
Durability
Value
Features
Design
Usability
great sounding speakers

August 22, 2011

They are hooked up to a JVC DVD/CD/MP3 player and sound great with movies and music but they probable need a small amp to get full potential and decibals.

17 of 40 found this helpful

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KZ

Canada

Overall
Durability
Value
Features
Design
Usability
if you don't like these your amp sucks

February 16, 2010

Best speakers hooked to my PG M100 Sweet

16 of 40 found this helpful

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ras

Lebanon, IN

Overall
Durability
Value
Features
Design
Usability
Infinity never disapoints

March 15, 2012

Very good overall sound quality and clarity. If you listen to any kind of metal these speakers do a wonderful job of recreating the sound from the drums especially the toms. The only negative I have about these is they try to play too low. Even crossed over they still seem to play lower than they should.

16 of 41 found this helpful

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Blake

Hendersonville, TN

Overall
Durability
Value
Features
Design
Usability
Infinity 63.9i 5/5

October 9, 2012

Wow! 5/5 Stars. That is how I would describe this product. I have had the speakers 6 months now and they are still booming! These speakers can go so loud so clearly. No distortion from what I have heard. I have 2 pairs of these running on a Boston Acoustic GTA-704. 70 watts RMS each and they are pummeling. They have surprisingly good bass, too. If you want crystal clear, loud music, I definitely recommend these speakers. If you want your ears to bleed, buy them!

14 of 38 found this helpful

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Accessory Tools and Products

Accessories added

NVX 25 ft. of True Spec 12 Gauge Speaker Wire

100% OFC wire with EnvyFlex metallic jacket insulates and protects against damage from extreme conditions.

Your Price $39.99

Streetwires 25 ft. of True Spec 12 Gauge Speaker Wire

You need speaker wire to connect your speakers!

Your Price $44.95

Belva 23 ft. of True Spec 12 Gauge Speaker Wire

100% Copper Clad Aluminum, high strand count with ultra-flexible PVC blended jacket for easy installation

Your Price $14.99

12-10 AWG Butt Connectors

These yellow butt connectors are ideal when connecting thicker speaker wire your new aftermarket speakers.

Your Price $6.99

12-10 AWG Yellow T-Tap Adapters

Allows for fast and easy splicing of wires by easily tapping into the cable.

Your Price $4.49

12-10 AWG Quick Disconnect Connectors

These yellow quick disconnect connectors make it easy to connect and disconnect speaker wire your to your new aftermarket speakers!

Your Price $6.99

NVX SDDK12 Door Kit

Eliminates speaker panel distortion and reduces door vibration, rattles and squeaks!

Your Price $49.99

Dynamat Xtreme Door Kit 10435

Enough sound dampening to cover most doors!

Your Price $59.99

Stinger Roadkill Door Kit

Use this to eliminate rattle from your doors!

Your Price $46.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $16.99

Universal Wire Puller & Grabber

Running wires has never been easier! This wire puller allows you to run wires through those hard to reach places!

Your Price $6.99

Xscorpion 9-Piece Nylon Plastic Pry and Chisel Tool Set

Easily removes dash/trims, door clips, panels and pins, rubber grommets and vehicle emblems.

Your Price $14.99

Xscorpion WDCR2 Window and Door Clip Remover

Removes and installs handle and window crank clips.

Your Price $6.99

3 in 1 Wire Quick Splice T-Tap and Butt Connector Crimper + Wire Cutter

Used for cutting copper and aluminum wires up to 8 gauge.

Your Price $29.99

NVX SDRLR1 Sound Dampening Rubber Roller

Install your Sound Dampening with ease! This heavy duty rubber roller is designed specifically to install your NVX products!

Your Price $7.99

Speaker Baffles for your Speakers

Enhance the sound of your speakers with these easy to install speaker baffles.

Your Price $9.99

Browse 3 questions and 5 answers
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Why did you choose this?
Sonic Electronix Store
replacing exact existing speaker on a motorcycle that were damaged during a custom installation. paired up with infinity kappa 3 way 6x9's. owned this set of 4 for 5 years and on their 3rd vehicle. absolutely the best speakers for the $$.
mark r on Jun 16, 2015
Great sound clear highs
Lewis M on Mar 25, 2015
I chose the Infinity 63.9i, because my Installer said they are the best on the market and will give me the quality sound I'm looking to have come from my 2012 Street Glide
CRYSTAL J on Mar 26, 2015
When installed what Ohms are the speakers? "True Four Ohm Technology" is confusing
Noah F on May 11, 2015
Best Answer: Hello Noah,

We'll make it simple to follow, because it is confusing:

16 gauge - 12 gauge speakers = 2 ohm load
Cheaper OEM speaker wire - 18 gauge = 4 ohm load

What Infinity is trying to say is, if you use large enough wire, the speaker will naturally stay at its 2ohm load. However, smaller/cheaper wire will naturally "throttle" the signal, therefore presenting a 4ohm load. If you do not know which gauge wire you are using and/or have please consult an installer.
Reply · Report · Rick MStaff on May 11, 2015
· Add Answer · I Have This Question Too (0)
I have a 2008 Honda Civic Si and I'm interested in installing these in the rear deck, but I have concerns about the clearance for the tweeters fitting under the stock grills. Do you know if they will fit?
Chad D on May 18, 2015
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

63.9i

UPC

050667110055

Weight

9.00lbs

Internal SKU

639i

Internal Product ID

13447

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Infinity Kappa 63.9i

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