Skip Navigation
Watch a product review

Infinity Reference X REF-6402cfx

4"x6" 2-way car speakers

Item #: 108R6402CX

In Stock

21 Reviews | 2 questions - 2 answers


Price Break:-$40.00

Installation gear for most cars

Your price: $59.99 pair Earn up to 60 Rewards points

Add to Cart

+ Add to wishlist + Email me alerts for this product

View all associated offers

Does it fit my car?

Select your car

Find what fits your car

Can't find your exact car?

Designed for more clarity

Do you want to hear the details you've been missing in your car's sound system? You'll enjoy exceptional clarity from Infinity's Reference X Series REF-6402cfx 4"x6" speakers. Infinity uses textile dome tweeters to give you amazing levels of detail without sounding harsh.

REF-6402cfx 4

Larger woofer for more bass

The REF-6402cfx features tough polypropylene woofers and durable hi-roll rubber surrounds that deliver strong performance. Each Plus One+ woofer sports a significantly larger cone than speakers of similar size, adding plenty of punch to the speaker's smooth and accurate highs.

Great for any power supply

You can power these speakers with up to 45 watts of RMS power — they'll work great with an external amplifier, but they're also sensitive enough to be a good match for a factory or aftermarket stereo. Plus, Infinity comes up with a safe way to get a little more power out of your system — these 3-ohm speakers combine with the speaker wire in your car so your car stereo sees actual 4-ohm impedance. Grilles are not included — factory grilles are appropriate for most installations.

Product Highlights:

  • 4"x6" 2-way speakers (pair)
  • Plus One+ polypropylene woofer cone with hi-roll rubber surround
  • 1" edge-driven textile dome tweeter
  • True Four Ohm Impedance technology: speaker's 3-ohm impedance combines with speaker wire impedance for a 4-ohm load
  • compatible with virtually all factory or aftermarket car stereos
  • power range: 5-45 watts RMS (135 watts peak power)
  • frequency response: 75-21,000 Hz
  • sensitivity: 92 dB
  • top-mount depth: 1-7/8"
  • warranty: 1 year
  • Our 60-day money-back guarantee

Infinity Reference X REF-6402cfx Reviews

Average Customer Review:

21 Reviews

Infinity 4x6

Written by: HiFi from West Virginia on December 14, 2015

2011 Chevrolet Silverado 1500
Crutchfield Customer Review (What's this?)

Great replacement for 2011 Silverado 1500 Std. Cab. Matched them up with 6 1/2 Infinity door speakers.



Top shelf implant

Written by: Craig from Lowell, Ohio on December 10, 2015

1998 Chevrolet S10
Crutchfield Customer Review (What's this?)

Installed the 4/6 and the 6 3/4 in my S10 and it sounds awesome. Plenty of base and the imagery is excellent. Nice upgrade.



Excellent sounding small speakers

Written by: hitch from Wichita, KS on October 21, 2015

2003 GMC Sierra 1500
Crutchfield Customer Review (What's this?)

These Infinity speakers provide the best sound possible from a small 4" package. Separate, integrated tweeters provide great clarity.

Pros: Fits most 4" GM applications. Included, removable mounting brackets. Big sound. Clarity of sound.


Great Factory Replacement

Written by: TB from Maryland on June 18, 2015

2003 Chevrolet Silverado 2500/3500
Crutchfield Customer Review (What's this?)

Sound great as a factory replacement in my 2003 Silverado 2500

Pros: Crisp & clear high range

Cons: Bass is ok

Infinity Reference X REF-6402cfx

Written by: Wayne G from Lebanon, TN on April 27, 2015

1999 Chevrolet Silverado
Crutchfield Customer Review (What's this?)

Bought for the rear to go with the Infinity Reference X REF-6500cx I got for the front of my 99 Silverado. Awesome sound even from the stock stereo which I did not want to replace at this time. Infinity makes a great product, and Crutchfield made the perfect recommendation based on my needs and music taste. Still haven't decided whether or not I want to add a small, powered subwoofer, but if I do, I'll be getting it from Crutchfield. They have evaluated hundreds of systems, and always seem to know just what you need.

Pros: Great sounding speakers. Installation went very well. Crutchfield support cannot be beat

Cons: None

Great Replacement

Written by: Uppy's from Lancaster, Wisconsin on April 22, 2015

2000 Pontiac Grand Am
Crutchfield Customer Review (What's this?)

Replaced factory 4x6 speakers in 2000 Grand Am with these and the sound is amazing combined with a Pioneer head unit and 12" subs.

Pros: Very clear sound.

Cons: None

Infinity Reference X REF-6402cfx

Written by: jnzcrue from Illinois on January 24, 2015

2004 GMC Sierra 1500
Crutchfield Customer Review (What's this?)

There was not much difference b/t the Infinity speakers over the factory speakers they replaced in sound quality (construction quality big difference). Mids and High acoustics pretty good bass is terrible. Too the point I have to adjust stereo sound when certain songs come on (I also do not run the system hard). I have a Pioneer head unit that I need to keep the volume level no higher than 20 before they start to sound blown on bass (only). If coupled with sub and crossover, then probably pretty good speakers.

Pros: Price was very fair for Infinity Speakers, installation easy with Crutchfield MasterSheets, material construction quality of speaker.

Cons: Bass very weak even for a small speaker.

Great Sound

Written by: JBMatt66 from Indiana on December 28, 2014

Crutchfield Customer Review (What's this?)

Great sound and fit right into the openings



Great highs, Crappy Lows

Written by: Kevin (1995 S10 Extreme) from East Brunswick, NJ on December 27, 2014

Crutchfield Customer Review (What's this?)

Speakers sound really good when paired with a subwoofer, or larger component speakers (both in my case; 6.5in components in the doors and 10in shallow sub behind the seat) but really add nothing in the area of bass. The speakers are in the dash of my pickup, and add great clarity and loudness to the soundscape, but really lack in bass production; most likely due to its lack of surface area, but that was expected with the 4x6s. Also, the plate they come attached to seems flimsy and isn't securely attached to the speaker itself. Ended up removing the rectangular plastic plate it is attached too, and re-attaching it with larger surface screws and glue.

Pros: Great clarity and high notes.

Cons: Horrible bass quality, and crappy mounting plate.

great speakers

Written by: John from georgia on December 26, 2014

2011 Chevrolet Silverado 1500
Crutchfield Customer Review (What's this?)

great sound, good bass considering the size of the speakers. I paired these with Infinity Reference X REF-6502ix in doors and pioneer head unit. Vast improvement over factory. Installed in 2011 silverado std cab

Pros: quality built, great sound overall great speakers

Cons: I haven't found any


Written by: Irby t a from Lafayette la on September 4, 2014

1993 Chevrolet C Series
Crutchfield Customer Review (What's this?)

Sounds good in truck The 6.5 next. The fix great




Written by: Derrick F. from Arvada, CO on June 16, 2014

2002 Pontiac Grand Am
Crutchfield Customer Review (What's this?)

These speakers are a huge improvement over our stock ones. Especially since the stock ones were made out of paper. Install was super easy.

Pros: Great sound, Ease of install, quality material.


Infinity Reference X REF-6402cfx

Written by: Anonymous from Kettering, OH on April 4, 2014

Crutchfield Customer Review (What's this?)

The Infinity REF-6402cfx speakers recommended by a Crutchfield phone rep did not fit the back doors of my 2007 Chevy, Silverado ext, cab. I returned them for a pair of Infinity REF-6502ix which fit perfectly and sound fantastic.



Great Product as always

Written by: Adam A from Palatka, FL on December 18, 2013

2003 Chevrolet Silverado 1500
Crutchfield Customer Review (What's this?)

Just another great Infinity product!

Pros: Clear sound quality at a low price


Nothing overly special, but decent

Written by: Anonymous from Kennesaw, GA on July 18, 2013

1995 GMC Sierra
Crutchfield Customer Review (What's this?)

I was recommened these speakers from a crutchfield advisor as a good all around speaker. I'd say they're fairly good quality. The highs and mids on them are crystal clear but the bass is reletively lacking presence but it is afterall a 4x6 speaker. Doesn't sound badat all, but I think its lacking on the bass side a tad

Pros: Awesome highs and mids, fit perfectly with no modification required

Cons: Simply a lack of bass

Infinity Reference X REF-6402cfx

Written by: Robert from San Antonio, TX on May 22, 2013

2003 Chevrolet Silverado 1500
Crutchfield Customer Review (What's this?)

I replaced the worn out speakers in my 2003 Silverado with these speakers. The installation was pretty easy with the helpful links on the website. The speakers sound great and I couldn't be happier. I might just look into a new radio in the future to go with the new speakers.



great product

Written by: NateT from Boise, ID on May 10, 2013

1990 Chevrolet C Series
Crutchfield Customer Review (What's this?)

Great sound, good fit, in a small package.




Written by: Andycapt from Jersey cape on May 2, 2013

Crutchfield Customer Review (What's this?)

Just plain great. 6030's in the front

Pros: Always good stuff from these people

Cons: None

Great Speakers!

Written by: Shane from Huntsville, AL on April 28, 2013

2007 Chevrolet Silverado 1500 Classic
Crutchfield Customer Review (What's this?)

Outstanding replacement of mediocre factory speakers! These sound great even with factory stereo. I am replacing factory stereo soon and can't wait to hear the complete setup!

Pros: Sound, ease of installation, value


Infinity Reference X REF-6402cfx

Written by: Anonymous from Fluker, LA on March 5, 2013

2007 Chevrolet Silverado 1500 Classic
Crutchfield Customer Review (What's this?)

Crisp and clear. Sounds great!!!!




Written by: Bobsharonc from Derby ks on November 19, 2012

The sound of the speakers were no better than the orginal equipment. Plus where they connect to the panel they are made of a hard brittle plastic that breaks shortly after installation.



Hands-on research

What's in the box?

Download owner's manual

  • Two 2-way speakers
  • 2 Standard 4x6 mounting adapters (installed)
  • 8 Machine screws (attaching speakers to mounting brackets)
  • 2 Adhesive foam gaskets
  • 2 Infinity logos
  • Template on box
  • Owner's manual (English/ Danish/ German/ Spanish/ Finnish/ French/ Italian/ Dutch/ Polish/ Portuguese/ Russian/ Swedish/ Turkish/ Chinese)

Features and Specs

Design 2-way
Tweeter Design Edge-Driven Dome
Tweeter Composition Textile
Woofer Composition Polypropylene
Woofer Surround Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Sensitivity 92 dB at 2.83 volts
Frequency Response 75 - 21k Hz
RMS Power Range (Watts) 5-45
Peak Power Handling (Watts) 135
Impedance (Ohms) 3
Top-mount Depth (Inches) 1 7/8
Bottom-mount Depth (Inches) N/A

Product Research


Plus One+ Woofer Cones: Each speaker uses a cone significantly larger than other speakers of the same size. This is accomplished by using a unique basket design and hi-roll surround. The Plus One+ design offers greater bass output and increased efficiency.

Hi-roll Rubber Surrounds: The hi-roll rubber surrounds allow the woofers a greater range of movement, resulting in longer X-max and more bass output.

Textile Dome Tweeters: Each speaker uses an edge-driven textile dome tweeter for smooth, accurate highs.

True Four Ohm Impedance Technology: The speaker's 3-ohm impedance combined with the impedance of your speaker wire provides a true 4-ohm load to your connected head unit or amplifier.

Power Handling: Although Infinity rates the 6402cfx speakers at 45 watts RMS (continuous average), they also recommend amplifiers with a power rating from 5 to 50 watts RMS.

Bottom Mounting: While the standard 4x6 adapters appear to be easily removable, they are glued in place at four points around the perimeter (in addition to the four screws, which are obvious). With the adapters in place, the speakers fit many top mount standard 4x6 and metric 4x6 applications. If the adapters are removed the speakers will fit additional top mount metric 4x6 applications, as well as bottom mount metric 4x6 applications.

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

Four popular car speaker lines
by Robert Ferency-Viars

Recently, we gathered members of the Crutchfield car A/V writing team into our Crutchfield Labs car listening room for some critical listening of four of our most popular car speaker families. We...

What are the Labs?