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Infinity Kappa 800W

Kappa Series 8" subwoofer with selectable 2- or 4-ohm impedance

Item # 108KAPPA8

With their rugged construction and sophisticated engineering, Infinity's Kappa subwoofers excel in a variety of...

With their rugged construction and sophisticated engineering, Infinity's Kappa subwoofers excel in a variety of...

Item # 108KAPPA8

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C$279.99 each
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About the Infinity Kappa 800W

All-around excellence

With their rugged construction and sophisticated engineering, Infinity's Kappa subwoofers excel in a variety of applications, equally at home in ported or sealed enclosures. These dependable subs feature switchable impedance so they'll always fit into your system, and they'll handle plenty of power so they'll deliver powerful, accurate bass. Plus, Infinity protects these subs with an impressive 3-year warranty.

All-around excellence

With their rugged construction and sophisticated engineering, Infinity's Kappa subwoofers excel in a variety of applications, equally at home in ported or sealed enclosures. These dependable subs feature switchable impedance so they'll always fit into your system, and they'll handle plenty of power so they'll deliver powerful, accurate bass. Plus, Infinity protects these subs with an impressive 3-year warranty.

Selectable impedance

Infinity's Kappa 800W 8" subwoofer features the unique Selectable Smart Impedance design, which lets you build exactly the system you want — high-power or multi-sub — without complicated wiring. Just flip the convenient impedance switch to safely choose between 2 or 4 ohms. If you're thinking about upgrading your amplifier or adding another sub down the line, this sub makes it easy to reconfigure — and it's nearly impossible to wire incorrectly.

Rugged construction

This sub handles plenty of power and sounds great in sealed or ported enclosures. Infinity's proprietary aero-cooling design helps keep the 2" voice coil cool. The acoustically damped glass-fiber cone minimizes distortion, giving you nothing but pure bass. And the steel basket provides a solid base for the sub, which handles up to 400 watts RMS. Infinity's Kappa subwoofers are known for their sound quality, and they offer the wiring versatility you need to build a system for your changing needs.

To drive this single subwoofer, we recommend a mono amplifier rated between 300 and 600 watts RMS at 2 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

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Product highlights:

  • 8" subwoofer with selectable 2- or 4-ohm impedance
  • coated glass-fiber cone with rubber surround
  • steel basket
  • frequency response: 30-200 Hz
  • power rating: 400 watts RMS (1600 watts peak power)
  • sensitivity: 89 dB
  • top-mount depth: 5-3/16"
  • sealed box volume: 0.4 cu. ft.
  • ported box volume: 1 cu. ft.
  • grille not included
  • warranty: 3 years
  • Our 60-day money-back guarantee
  • MFR # Kappa 800W

What's in the box:

  • One 8" Woofer
  • Screw cover ring (installed)
  • Self-adhesive foam gasket
  • Owner's manual (English/ French/ Spanish/ fifteen other languages)

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Infinity Kappa 800W reviews

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Infinity Kappa 800W

Crutchfield customer from Elk Grove, CA on 11/7/2018

2018 Honda Accord Touring

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Superb sub. Love it in my 2018 Accord Touring

Pros:

Cons: None

Crutchfield response on

3 of 3 found this helpful

Infinity Kappa 800W

Chris from Pittsburgh, PA on 9/16/2018

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As with the rest of the kappa series, these are clear and crisp.

Pros: 2/4 oh selectable is a plus.

Cons:

Crutchfield response on

1 of 1 found this helpful

Infinity Kappa 800W

Joe P from Pottstown, PA on 8/26/2018

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Had to cut my box opening a bit but overall happy with this sub. Good clean bass over all types of music, very musical with good punch.

Pros: Clean musical bass, solid built, and astetically pleasing!

Cons: Might not be enough boom for some. Had to modify box some to fit basket.

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2 of 2 found this helpful

Infinity Kappa 800W

Crutchfield customer from Louisville, KY on 4/26/2018

2009 Lexus ES350

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I upgraded my OEM sub in my 2009 Lexus ES350 and the difference is unreal! I feel like ill soon have to upgrade my amp but for now I am very satisfied with this sub. It did require modifications to make it fit in the rear shelf where the old one was but not enough to defer me from giving it 5 stars. Overall as I said, extremely satisfied.

Pros: Great solid crisp bass

Cons: Requires some specialty tools to make it fit in an OEM shelf.

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3 of 3 found this helpful

Infinity Kappa 800W

Crutchfield customer from Colbert, WA on 4/1/2018

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Best ever

Pros:

Cons:

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0 of 1 found this helpful

Infinity Kappa 800W

Martin from Kansas City, MO on 3/20/2018

2013 Dodge Charger

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I'm very pleased with this product! It delivers what one should reasonably expect from an 8" sub mounted free air. I have a 2013 Dodge Charger. My goal was stealth and high quality sound while not giving up trunk floor space. Mission accomplished! The 8" hole in the rear deck was already cut from the factory. The sub is powered by the fifth channel of a Pioneer GMD 9605. The sub channel is rated at 350w @ 4 ohms. I have the input gain dialed back a bit as it is recommended to run this sub at about half it's rated 400 w rms when used in a free air install. The overall sound is very full and satisfying. Powerful sounding even at lower volume levels...although it does get loud! However, it's not my goal to shake the ground two blocks away. I'm happy!

Pros: Sounds great. Looks great. Very sturdy. 2 ohm/4 ohm switchable

Cons: None

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5 of 5 found this helpful

Infinity Kappa 800W

Anthony from Deer Park, NY on 2/17/2018

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Please keep in mind this is a 8" woofer. The reason I say that is most people that buy one of these give it 3-4 stars because they expect it to push as much air as a 12". It just is not physically possible from a engineering perspective. I've Had my fair share of 8" woofers. These are rated at 30 hz and I will guarantee with the correct tuned box, no questions you will get it and that's why I give it 5 stars. You get what you pay for. Completely and %100 reliability with the infinity name. I'm pushing 1200 watts x 2 in 4 and they have no issues with it. If for any reason you smell a new shoe smell from the rubber, please check to make sure you're not clipping the amp and heating up that coil just a bit. You're paying for a reliable sub that does what it's advertised to do. If you're looking for a car that rattles a block away, don't even look into 8" subs. You're never going to be satisfied because the 8" speaker of any brand will never push enough air to do so. Look right into 12" For that. So why did I choose an 8"? Well I messed up the size of my enclosure to fit the 10" by half inch so I had to do with 8". 8" speakers give you that tiggghhht kick in the chest and that punch that is always in perfect sink with your song. And then when you add a well designed Sub like infinity that makes that 8" flex all the way Down to 28-30 hz. It's perfect for my application of blending internal sub with loud speakers

Pros: Super compact. Takes a load of power and hits hard. Very stable. That ring makes it look super clean in any installation. Variable ohm switch so you can hook it up any way you choose. And in the future when you get even more power, only the flip of a switch to change. Ohm carbon looks outstanding and they give you an infinity sticker

Cons: Be careful what you use to clean it with. Use cloth, not liquid Putting wire in these spring posts is really hard, but you only have to do it once thank goodness

Crutchfield response on

2 of 2 found this helpful

Compact and composed

John from Montgomery, TX on 1/15/2018

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I purchased the kappa 800w, the Sound Ordinance single sealed box and the JBL gtx500. I wanted bass I could hear at low volumes but didn't loose it's composure at higher volumes. I am extremely happy with this combo, and I was able to take advantage of a few sales, win win. The only problem I ran into was the cutout was not large enough, I had to shave some material to get the woofer to fit, also it is fractionally smaller volume then recommend, I just tore up an old pillow and stuffed the enclosure halfway. The sound is excellent at all volumes without rattling the car or distorting at moderate to high volume. Simply can not be beat at this price.

Pros: Tiny enclosure, handles adiqute power, and does not rattle the trunk. Great volume at all levels.

Cons: May not be enough for some.

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3 of 3 found this helpful

Infinity Kappa 800W

Crutchfield customer from Minneapolis, MN on 8/1/2017

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Nice clean base, not a monster, but great for the size and price.

Pros:

Cons:

Crutchfield response on

1 of 6 found this helpful

Quality bass with plenty of volume

Jim from St Louis, MO on 2/20/2017

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Upgraded to these after one of my 8" type rs had the cone separate from the surround. Had two Rockford phosgate p2s before the alpines and some JL w3s before that. Overall these things perform really well. Have two of them in a sealed box being fed from mono phosgate amp at 1 ohm, tuned the amp for 400w apiece with a test tune from MTX audio and a fluke meter, and they fill my truck with lots of bass. They are louder than the type rs and every other 8" sub I've had but are much more precise and smooth, the sound quality is really nice and clearly evident. Granted you shouldn't expect crazy lows like you get from bigger subs in a ported box, but these things don't disappoint for quality bass production. If you put them in the right box, tune your amp correctly, and set the filters how u want, you will like what you hear.

Pros: Quality of sound, quantity of sound, selectable impedance, solid construction

Cons: Low freq bass

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13 of 14 found this helpful

Infinity Kappa 800W

daril from Jacksonville, FL on 12/14/2016

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I gave 3 starts but i have not tested or seeing the product yet. Read on! The reason i am writing this "review" is for everyone out there interested on these new Infinity Kappa series to contact Harman and asks them for the Subwoofer Displacement, yes the displacement. They do not give us this information on the manual. I called their customer service but they never were able to find this number. Three different customer agents told me that unless there are more customer asking for this, they will not change the manual to provide this Information. The manual tells you what space you need on sealed and vented, but with the driver and the vent displacement included, meaning that if you do the vented box, it has to be the way they tell you on the manual, rounded port tuned to 40HZ. According to Winisd this set up will give you 197Feet/Second air velocity on the port at 400RMS = (a lot of port noise). Even if you don't care about port noise, a. Many people, like myself, will rather build slotted ports over rounded. b. Without driver displacement we cannot build different box designs for the subwoofer. So here i am on this dilemma, i really want to by this sub but without driver displacement i just will not, I/we need this in order to build a vented box. Sealed box is easy since all we have to do is build a box with 0.4 cubic feet and put the subwoofer in, done! Hopefully someone will come with the sub displacement, for now, i just look at the pictures and wait.

Pros:

Cons: Driver Displacement is not on the manual.

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26 of 90 found this helpful

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Pros:

Cons:

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Product Research

Features
Enclosure Compatibility
Specifications

Features

Selectable Smart Impedance (SSI): A switch on the input terminal allows you to easily change the woofer's impedance between 2Ω and 4Ω settings. (The connected amplifier should be off when changing the impedance.) The power handling is the same for either setting; 400 watts RMS/1600 watts peak.

Woven Glass-Fiber Cone: The cone material is extremely stiff, minimizing cone flex; this results in very low distortion and improved clarity.

Vented Polepiece: Venting the polepiece reduces air compression under the dustcap which minimizes mechanical noise and provides more constant mechanical Q for reduced distortion.

Terminal: The spring terminals will accept bare wire up to 8 gauge.

Enclosure Compatibility

Sealed Box: Infinity recommends a sealed enclosure with an internal volume of 0.4 ft³.

Ported Box: Infinity recommends a ported enclosure with an internal volume of 1.0 ft³ with one 3" diameter x 10" long port, resulting in a tuning frequency of 40 Hz. They also recommend using a sub-sonic filter.

Free-air Mounting: In addition to being compatible with sealed and ported enclosures, the woofer can be used in free-air applications. A free-air subwoofer is designed to be mounted on a baffle board, which separates the front of the speaker from the back. For instance, you could mount this woofer to a board attached to the rear deck or placed in the trunk against the rear seat. The trunk acts as the enclosure housing the subwoofer. Because there is no specific volume of air to stiffen the suspension, the free-air power handling is approximately half that of the woofer in a box, in this case 200 watts RMS.

Specifications

Thiele-Small Parameters: Because the woofer has two impedance settings, there are two sets of Thiele-Small parameters:

 
DC Resistance (Ω) 2.005 3.941
Inductance (mH) 1.10 0.85
Vas (liters) 12.87 12.87
Qms 4.0 4.0
Qes 0.46 0.459
Qts 0.412 0.412
Fs (Hz) 34.5 34.5
Radiating Area (m²) 0.02164 0.02164
Xmax (mm) 9.25 9.25
Motor Force Factor (TM) 10.2 14.3

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Went to lower frequencies and could sound as good as two subs(quality over quantity). Also Harman makes these and love the sound of deep rich bass. Not a guy for a lot of "boom boom" but love the feel of balanced sound. [ Conner  Mar 01, 2019 ]
A
To save room in my trunk and to a clean factory look [ Bruno  Jan 14, 2019 ]
A
Fits (almost) 2018 Accord and works in free air application. [ joseph  Oct 25, 2018 ]
A
Good reviews and a great price. [ Scott  Oct 11, 2018 ]
A
free air factory location [ ML CONSTRUCTION  Jun 09, 2017 ]
A
Good price and power handling. Fits perfect on the rear deck of a 2017 Chrysler 200 [ Nelson  May 15, 2017 ]
A
Quality, compared specifications and this had the best rated numbers. I've bought infinity in the past and they have awesome sound quality and good value for the price! [ James  Mar 12, 2017 ]
A
Looks like it fits my needs perfectly. [ Michael  Feb 12, 2017 ]
A
Huge power, Reputable brand, and a great size for a King Cab Frontier! [ K  Dec 04, 2016 ]
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1 question already asked

Q
Hi there Will the infinity Kappa 800 subwoofer fit inside Item #: 663XJPOD advertised in your web stock with no issue? Many Thanks
[ Khalid  Nov 30, 2018 ]
3 answers
A
Yes its fits
[ Timothy  Dec 21, 2018 ]
A
Hey, I looked into the detentions and it looks like it should fit, but im not 100% sure. It will probably be tight depth wise so I would ask someone on crutchfeild if that will affect the sound or not. If you plan on covering ur sub, look into buying a separate cover, they are about 10-20 bucks but worth it. The mesh guard included with the the box will not cover the sub. Good luck, Will
[ Will  Dec 21, 2018 ]
A
Sorry, no. The Kappa 800W requires a larger cutout hole (7.292') than what the XJ-Pod provides (7.0625").
[ Ryan  Dec 05, 2018 ]  Staff

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