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Infinity Reference X REF-6402cfx

4"x6" 2-way car speakers

Item #: 108R6402CX

In Stock

15 Reviews | 2 questions - 2 answers

Free Installation gear for most cars

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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

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 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.

Infinity Reference X REF-6402cfx Reviews

Average Customer Review:

15 reviews
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Infinity Reference X REF-6402cfx

Written By jnzcrue, Illinois on Saturday, January 24, 2015

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, Indiana on Sunday, 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), East Brunswick, NJ on Saturday, 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, georgia on Friday, December 26, 2014

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, Lafayette la on Thursday, September 04, 2014

Crutchfield Customer Review (What's this?)

Sounds good in truck The 6.5 next. The fix great


Written By Derrick F., Arvada, CO on Monday, June 16, 2014

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, Kettering, OH on Friday, April 04, 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, Palatka, FL on Wednesday, December 18, 2013

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, Kennesaw, GA on Thursday, July 18, 2013

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, San Antonio, TX on Wednesday, May 22, 2013

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, Boise, ID on Friday, May 10, 2013

Crutchfield Customer Review (What's this?)

Great sound, good fit, in a small package.


Written By Andycapt, Jersey cape on Thursday, May 02, 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, Huntsville, AL on Sunday, April 28, 2013

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, Fluker, LA on Tuesday, March 05, 2013

Crutchfield Customer Review (What's this?)

Crisp and clear. Sounds great!!!!


Written By Bobsharonc, Derby ks on Monday, 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.

Get everything you’ll need to enjoy your new Infinity Reference X REF-6402cfx

Reduce ambient road noise and your vehicle's "rattles," for better sound inside your car.
You'll need speaker wire to connect your speakers to your amp.
Keep your speakers clean and dry. They compress to fit behind your speakers.
These speaker connectors are handy if you're running new speaker wire or if your speakers have oversized terminals.
The right tools will help keep your installation simple and clean.
If your stereo doesn't cut the deep bass from your full-range speakers, a set of bass blockers can help prevent distortion and give you cleaner bass too.
Dynamat 10415 Xtreme Speaker Kit

Dynamat 10415 Xtreme Speaker Kit

Two 10-in. x 10-in. Sheets

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Dynamat 10435 Xtreme Door Kit

Dynamat 10435 Xtreme Door Kit

With four 12" x 36" sheets — covers two doors

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Dynamat SuperLite Tri-Pak

Dynamat SuperLite Tri-Pak

Triple package — 3 sheets, 12 square feet (Model #10612)

Item #: 15410612


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T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW16WB1


T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW12WB1


Stinger PRO Series Speaker Wire

Stinger PRO Series Speaker Wire

Priced per foot (16 Gauge)

Item #: 541SPW516B



XTC 4"x6" Speaker Baffles

Protect your speakers (3-1/4" depth)

Item #: 237XT46


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Boom Mat 4

Boom Mat 4"x6" Speaker Baffles

Protect your speakers
Regular and slim-line sizes (Regular: 3-1/2" depth)

Item #: 696B050350


Metra Female Quick Slides

Metra Female Quick Slides

An assortment of female quick slide connectors for connecting to speaker terminals

Item #: 120FQS10PK


Metra Crimp Tool and Connectors

Metra Crimp Tool and Connectors

Package contains crimp tool and over 150 pieces

Item #: 120CRIMPKT


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Pro.Fit Hook Tool Set

Pro.Fit Hook Tool Set

Installation tools — pair

Item #: 042DM3022


Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6NGL


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S&G Tool Aid 87615

S&G Tool Aid 87615

Window and Door Clip Removal Tool

Item #: 18187615


S&G Tool Aid 87650

S&G Tool Aid 87650

Door Trim and Panel Removal Tool

Item #: 18187650


Pro.Fit Wire Worm

Pro.Fit Wire Worm

Installation tool helps route wiring through tight spaces

Item #: 042DM4533


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S&G Wire Cutter/Stripper Tool

S&G Wire Cutter/Stripper Tool

Cuts and strips 12- to 22-gauge wire

Item #: 18119100


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Skewdriver Pro SPK4042

Skewdriver Pro SPK4042

Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)

Item #: 180SPK4042


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Spec Tools SQR-200a Squeeze Wrench

Spec Tools SQR-200a Squeeze Wrench

Narrow space ratchet kit with 18 sockets

Item #: 180SQR200A


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Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6LNGL


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Install Bay IB35400

Install Bay IB35400

Premium door panel and trim tool

Item #: 12035400

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Install Bay 3320

Install Bay 3320

Auto-ranging digital multimeter

Item #: 1203320

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Posi-Products™ Car Speaker Connectors

Posi-Products™ Car Speaker Connectors

8 connectors for installing car speakers

Item #: 669PP502


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DEI Heat Shrink Tubing

DEI Heat Shrink Tubing

Black 4-foot length (Assortment)

Item #: 696010839


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Bass Blockers

Bass Blockers

Pairs (300 Hz cut-off)

Item #: 127BB300A2


Add to Cart

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