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Infinity Reference X REF-6500cx

6-3/4" component speaker system — also fit 6-1/2" openings

Item #: 108R6500CX

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19 Reviews



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REF-6500cfx 6-3/4

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-6500cx 6-3/4" component speaker system. The package includes two 6-3/4" woofers, two 3/4" tweeters, and two external crossovers, along with mounting hardware and grilles.

Textile tweeters

Infinity uses 3/4" textile dome tweeters that give you amazing levels of detail without sounding harsh. Mount these tweeters in the right spot in your vehicle, and you'll hear a new world of sound as instruments and vocals become more natural and clearly defined. Infinity includes hardware for surface- or flush-mounting the tweeters, plus Starfish brackets that help you install the tweeters in many factory tweeter openings.

Product Highlights:

  • component speaker system includes 2 woofers, 2 tweeters, and 2 crossovers
  • 6-3/4" Plus One+ polypropylene woofer with hi-roll rubber surround
  • adapter rings included for 6-1/2" openings
  • 3/4" edge-driven textile dome tweeter
  • Starfish™ mounting brackets for easier tweeter installation in factory locations
  • 2-way external crossover network (18 dB/octave, 3,500 Hz high- and low-pass)
  • 3-ohm impedance for extra power (compatible with virtually all factory or aftermarket car stereos)
  • tweeter adjustment circuits (0, +3 dB)
  • power range: 5-90 watts RMS (270 watts peak power)
  • frequency response: 53-21,000 Hz
  • sensitivity: 93 dB
  • woofer top-mount depth: 2-1/16"
  • warranty: 1 year
  • Our 60-day money-back guarantee

Why install component speakers?

A component speaker system gives you the best possible performance from your car audio system. A system consists of separate woofers, tweeters, and crossovers, each designed to cover one specific range of frequencies. As separate components, the woofer can move freely to deliver more powerful performance, while the tweeter can be custom-mounted in a better spot up closer to your ears, revealing a whole new world of detail. Separate crossovers are far superior to the simple filters wired into full-range speakers, so the components work together for smoother, more focused sound.

Hands-on research

What's in the box?

Download owner's manual

  • 2 Woofers
  • 2 Tweeters (each has attached 6" speaker leads)
  • 2 Woofer grilles
  • 2 Grille frames
  • 2 Crossovers
  • 2 Plastic mounting rings (Chrysler/GM)
  • 2 Flush-mount cups
  • 2 Threaded flush-mount adapters
  • 2 Plastic locking nuts
  • 2 Surface-mount cups
  • 2 Starfish tweeter mounts
  • Eight 1-3/8" Self-tapping Allen head screws
  • Eight 1" Self-tapping pan head screws
  • Eight 1/2" Self-tapping pan head screws
  • Six 5/8" Self-tapping flat head screws
  • 3mm Allen head bit
  • 2 Washers
  • 2 Nuts
  • 8 Speed clips
  • 2 Adhesive backed 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)

Product Research



Plus One+ Cones: Each woofer uses a cone significantly larger than other speakers of the same size. This is accomplished by using a new basket design and hi-roll surround. The Plus One+ design offers greater bass output and a significant increase in 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.

Mounting: Without an adapter, the 6500cx woofers fit standard 6-3/4" applications. Given their required cutout, they will also fit standard 3-hole 6-1/2" and 4-hole 6-1/2" applications without an adapter, but new screw holes must be drilled. Using the included adapter brackets they can be mounted in a wide variety of 6-1/2" and 6-3/4" applications, without any modification.


Material: Each tweeter features a 3/4" edge-driven textile dome for smooth, accurate highs.

Mounting: The I-Mount tweeter mounting system and Starfish mounting brackets give you several different ways to mount the tweeters:

  • I-Mount Mounting System: The tweeters can be surface- or flush-mounted with Infinity's innovative I-Mount system:
    • Surface Mount: Surface mounting the tweeters involves screwing the surface-mount cup to the mounting location, then inserting and locking the tweeter into the cup.
    • Flush Mount: Flush mounting is made easy through the use of the threaded flush-mount housing and plastic locking nut. Once a cutout is made, the tweeter is installed in the flush-mount adapter, then into the flush mount housing and inserted into the hole. The large plastic locking nut is threaded onto the adapter (from behind the mounting surface) to hold the complete assembly securely in place. When flush mounted, the tweeters may be angled for optimum response and imaging.
  • Starfish Mounting Brackets: The Starfish mounting brackets allow the tweeters to be installed in factory locations behind the grilles:
    • Bottom Mount: Once the Starfish bracket is trimmed, it is secured to the underside of the grille panel. The tweeter must be inserted into the bracket and locked into place before the bracket is mounted.
    • Surface Mount: Once the Starfish bracket is trimmed, it is screwed to the top of the mounting surface behind the grille panel. Then, the tweeter is inserted into the bracket and locked into place.
    • Flush Mount: There are two sets of tabs to flush mount the tweeter in the Starfish bracket, yielding different mounting dimensions. The upper tabs mount the tweeter completely below the opening and are glued in place. The lower mounting tabs are screwed in place and result in a mounting height just under a half inch. Once the bracket is mounted, the tweeter is inserted into the bracket and locked into place.

Mounting Dimensions:

  I-Mount Surface Mount I-Mount Flush Mount Starfish Bottom Mount Starfish Surface Mount Starfish Flush Mount Starfish Flush Mount (below mounting surface)
Mounting Height 0.90" 0.672" 0.0" 0.885" 0.41" 0.065"
Depth 0.492" (screw depth) 0.808" 0.944" 0.492" (screw depth) 0.475" 0.88"
Frame Diameter 1.488" 1.845" 2.8" 2.44" 2.625" 3.04"
Cutout Diameter N/A 1.583" N/A N/A 1.51" 3.625"


Selectable Tweeter Output Level: Each 2-way crossover allows you to select the tweeter output level according to system requirements and personal preference; the tweeter level can be set to +3 dB or 0 dB.

Connections: The crossover inputs and outputs are screw terminals; they will accommodate bare wire or spade connectors up to 0.315" wide. There are four mounting holes in each crossover.


  • Width: 3.935"
  • Height: 1.209"
  • Depth: 3.171"


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 6500cx speakers at 90 watts RMS (continuous average), they also recommend amplifiers with a power rating from 5 to 200 watts RMS.

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.

Infinity Reference X REF-6500cx Reviews

Average Customer Review:

19 reviews
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Very good speakers

Written By 2006 Outback, Michigan on Tuesday, March 24, 2015

Crutchfield Customer Review (What's this?)

These installed relatively easily in the front doors of a 2006 Subaru Outback (had factory component speakers). The tweeters fit right into the factory brackets, the woofers needed one additional hole drilled for the brackets, and the crossovers nestled nicely just forward of the door pull--there's a good open space there, although I couldn't get all four mounting screws in due to access openings in the metal. No matter; two screws did the job solidly. The space isn't completely identical on both sides, but there's definitely room in each door. The factory wiring diagrams in the Haynes manual and in the Crutchfield database didn't match what was in the doors (they didn't match each other, either). The solution is that the twisted pair of wires is the input to use for the crossover, and then you just bypass the wires going from the tweeter to the woofer. Tape the old harnesses back out of the way and be happy.

They sound terrific, a huge improvement. I added a pair of Infinity Reference X REF-6502ix in the rear doors at the same time. Together, they give great balance, clarity, and presence. We're happy enough with the bass, but any speaker is going to sound different from vehicle to vehicle. If you want real thump, add an amp.

Pros: Fairly straightforward installation and sound great.

Cons: Bass isn't tremendously strong.

Great Speakers

Written By Mark L., California on Monday, January 19, 2015

Crutchfield Customer Review (What's this?)

I bought these speakers to switch out my other 6x9 infinity's and what a difference. Much better detail and sound stage to go with the sub I have. These are a must have if you enjoy listening to music. Thank you Crutchfield

Pros: Everything to gain

Cons: nothing

Great speakers.

Written By Jim, Howell, NJ on Tuesday, December 23, 2014

Crutchfield Customer Review (What's this?)

Great sound. Replaced stock speakers front and rear doors in my 2015 Sonata. Need a little More power behind them. Stock head unit not pushing enough at higher volume. Definitely a good upgrade.

Pros: Great sound quality at price. Sound better than some higher priced component speakers.

Cons: Adapter rings didn't fit car. Should have some wires to attach to speakers.

infinty reference x

Written By ricky f., palm coast florida on Friday, December 12, 2014

Crutchfield Customer Review (What's this?)

Amazing sound quality. The highs are so clear and clean. Very impressed.

Pros: Tweeters are amazing and many options available for there installation

Cons: Mids are a little weak on the lows but i am still very satisfied

Review Update

Written By Schambo, Bergen County on Wednesday, November 19, 2014

Crutchfield Customer Review (What's this?)

Update to my previous review. Lived with these speaker powered off the stock HU for a few weeks and was impressed with how they sounded. Then added the Alpine Power Pack amp to drive them. I basically doubled the power and all I can say is wow! These speaker sound amazing with some extra power. For the price and all the adapters included, this is a great choice. Will not disappoint.

Pros: Everything

Cons: None

nice speakers

Written By johnk9837, gallipolis ferry, wv on Tuesday, May 06, 2014

Crutchfield Customer Review (What's this?)

got these on sale for my son's pickup truck. sounds great.

Infinity Reference X REF-6500cfx

Written By Melvin, Lacombe, La on Friday, January 17, 2014

Crutchfield Customer Review (What's this?)

These speakers sound amazing. I upgraded the stock Rockford Fosgate speakers in my Nissan Xterra, and boy what a difference. I can't wait to install an amplifier on them.

Pros: Everything

Cons: Wish they were cheaper!!

Infinity Reference X REF-6500cx

Written By Anonymous, harrisonburg va on Thursday, January 02, 2014

Crutchfield Customer Review (What's this?)

Nice set of speakers

Great Speakers

Written By Chris W, San Diego, CA on Monday, December 16, 2013

Crutchfield Customer Review (What's this?)

These speakers are great! I have a JL amp running 150 Watts RMS to a pair of these speakers and the sound is amazing. In addition these speakers come with so many mounting pieces, you really have a lot of options. If you've ever tried to put a tweeter right where you wanted it, you will know what i'm talking about. I have a '09 Tacoma and these speakers fit in the front door nicely.

Pros: Great Sound! Many Mounting Options!

Cons: Instructions could be clearer.

Infinity Reference X REF-6500cx

Written By s, Bergen County, NJ on Monday, December 16, 2013

Put two sets of these in a 09 F150 Crew. Powering them off stock HU and they sound great. Did require speaker adapters and drilling into sail panel to install tweeters. Well worth the money. Big difference over stock speakers. With an amp I'm sure these speakers will sound even better.

Pros: Good quality. +3db button on crossover. Small tweeter produces clean highs. Many mounting options for tweeters. Comes with small plastic logos that attach to factory speaker grills.

Cons: No speaker wire included to attach speakers to crossover.

Superb Value

Written By Matthew, Fort Collins, CO on Monday, September 23, 2013

Crutchfield Customer Review (What's this?)

I recently put these speakers in my 1998 Toyota Tacoma. After breaking them in a bit I must say that they are superb, especially given the reasonable price. There is very little discernible difference from my friends $500 dollar component speakers. Trebles and Mids are brilliant, and the base is sufficient. Overall it is very balanced, but to get the umph you need to fill certain genres you may need to add a sub. I was hesitant about the smaller tweeter at first, but it does the job well. This is my first Infinity speaker, and I am very satisfied. I did put a sheet of Dynamat extreme behind the speaker, and it does make a noticeable difference. It is worth the $25 dollars to get the speaker kit.

These speakers are extremely universal! Included in the box are an astounding number of options for both custom and stock mountings. I have never seen this in a component system before, and it was a pleasant surprise. Lots of hardware was also provided.

A note of warning though- you may want to get a set of female spade connectors to connect to the tweeters. I just used a butt end clip, but had to cut off a pair of nice spade connectors.

As always, Crutchfield was a pleasant experience. This is the forth time I have ordered from them, and have yet to encounter any issues. Delivery is always prompt, free, and packaged well. I will be coming back here for all my future needs.

Pros: Very balanced Superb sound quality Great value for the price range

Cons: Lack of female spade clips in installation kit. Installation directions provided by Infinity are rather vague.


Written By Jason, North Branch MN on Monday, August 26, 2013

Crutchfield Customer Review (What's this?)

Great speakers.. sound awesome!

Pros: Easy to mount..

Cons: None

Good speakers but incomplete kit

Written By Brian A, Danville, CA on Tuesday, June 25, 2013

Crutchfield Customer Review (What's this?)

It all ended okay, but the kit does not come with interconnect wires between crossovers and drivers. Crutchfield did not notify me of this at the time of purchase (by telephone). When I phoned and complained Crutchfield shipped me a set (specifically; female spade lugs), but this caused me a week delay in getting my car back on the road.

Cons: Incomplete installation kit

Infinity Review

Written By AaronA, Houston,Tx on Monday, May 13, 2013

Crutchfield Customer Review (What's this?)

The best component speaker I have ever owned. Recommend them for every one is in the market for buying speakers.

Awesome upgrade for stock radios

Written By John, San Diego, CA on Saturday, January 12, 2013

Very nice set of speakers. I installed these in my 2008 Astra and they fit perfectly. The tweeters fit perfectly in place of my stock ones and the bracket that Infinity supplied for the woofers fit my stock screw holes exactly. The improvement in the clarity of the sound is what really stands out in these speakers, I listen to a full range of music types and there nothing I've thrown at these tweeters that has caused them to crackle or become flat. You can hear everyone of the different high notes. As for the woofers they are a massive improvement over my stock component woofers, they really make the most of the meager bass output of my stock HU. With that being said I had also ordered an amp to connect to these speakers and decided to return it upon hearing how much louder and fuller these speakers make my stock radio. I highly suggest you buy the 10"x10" sheets of dynamat to surround your woofers because if your doors don't rattle before you install these they sure will after.

I matched these with the Reference 4000 series 4" speakers in my rear doors (Opel decided to put the larger speakers up front?) they play very well off of each other. Overall extremely satisfied

Pros: Huge improvement over stock speakers These will make the most out of the small amount of power that a stock HU puts out, for those of us who don't feel the need to install an amp

Cons: Like most automotive work there was some swearing and cut fingers, but the sound improvements are worth it No extras of any of the installation hardware, not necessarily a con, just something to remember so you don't end up crazy gluing your tweeters together like this guy.

More Than What I'd Expected!!

Written By Mike, Philly, Pa. on Saturday, December 29, 2012

Crutchfield Customer Review (What's this?)

I installed these bad boys in my BMW 325ci and they sound amazing. The installation was simple with the mounting brackets and Crutchfield was very helping with assisting me with any help that I needed. Buy these components you won't regret it!!!!

Pros: Great clarity sound and looks great installed.

Cons: Depends on your make and model you may need speaker brackets.

great speakers

Written By brian, arden nc on Thursday, December 13, 2012

Crutchfield Customer Review (What's this?)

i replaced my factory speakers in both the doors and behind the seat with these and they sound amazing even with my factory head unit. i put them into a 6x9 opening and they fit with just slight trimming which was because of the tweeter going into the top part of the adapter bracket they supply.

Pros: they fit well with the supplied bracket with a small bit of trimming. they sound great with my factory head unit. the deal i got on them was great.

Cons: i didnt care for the way the tweeter was mounted. they did offer two options and i liked how one of them was movable so you could aim the tweeter however if you were to surface mount these they wouldnt look good in my opinion. that being said i mounted them behind the door panel so it isnt seen and isnt a huge deal


Written By Brad, san diego on Tuesday, December 11, 2012

I put these in my 2008 suburban and powered them with a 800 wat Kenwood amp. They are by far the best sounding speakers I have had in any of my vehicles. The bass is deep and can be felt. The highs are clean and sharp. I found that I no longer have to increase the volume to hear all the details of the music. These things sound great at any volume level. They are a great value for the price.

Great Affordable Speakers

Written By New VW Beetle '99, Harbor City, CA on Monday, August 27, 2012

Crutchfield Customer Review (What's this?)

These speakers sound great and were easy to install. Only basic tools and moderate handyman skills needed. My only complaint is that neither the Crutchfield nor the Infinity instructions and pictures were very clear so it took me awhile to figure out how to attach the speakers with the brackets and ensure they would not produce a vibrating sound. Also, I did not change out my factory tweeters because they did not include a wiring harness for the tweeters like they did for the 6 3/4 speakers. I do not want to add tweeters anywhere else since there is factory wiring for the tweeters but I also don't want to have to cut the wiring harness off the old tweeters since they are still good. The wiring harness they did include for the 6 3/4" speakers worked great except the smaller connector does not fit snuggly so you have to bend the contacts on the connector to give it a tight connection.

Pros: Sounds good. Easy to install.

Cons: No wiring harness for tweeters. Instructions/Pictures not detailed enough.

Get everything you’ll need to enjoy your new Infinity Reference X REF-6500cx

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.
The right tools will help keep your installation simple and clean.
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