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Infinity Reference REF-6520cx

6-1/2" component speaker system

47 Reviews | 4 questions - 13 answers

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Our take on the Infinity Reference REF-6520cx

With a new component system, you'll hear the details you've been missing in your car's sound system. Infinity's Reference Series REF-6520cx 6-1/2" component speaker system offers exceptional clarity, thanks to 3/4" edge-driven textile dome tweeters that bring out all the details in your music without sounding harsh.

Invest in component sound

With a new component system, you'll hear the details you've been missing in your car's sound system. Infinity's Reference Series REF-6520cx 6-1/2" component speaker system offers exceptional clarity, thanks to 3/4" edge-driven textile dome tweeters that bring out all the details in your music without sounding harsh.

Big woofer = big sound

The tough polypropylene woofer with its durable hi-roll rubber surround delivers surprisingly 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.

Perfect for any power supply

You can power these speakers with up to 90 watts of RMS power — they'll work well with an external amplifier, but they're also a good match for a factory radio or aftermarket stereo. Plus, these 3-ohm speakers combine with the speaker wire in your vehicle so your car stereo sees actual 4-ohm impedance, so you get a little more volume out of your system.

Product Highlights:

  • component speaker system includes 2 woofers, 2 tweeters, and 2 crossovers
  • 6-1/2" 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
  • 3-ohm impedance for extra power (compatible with virtually all factory or aftermarket car stereos)
  • tweeter adjustment circuits (0, +3 dB)
  • handles up to 90 watts RMS (270 watts peak power)
  • frequency response: 53-21,000 Hz
  • sensitivity: 93 dB
  • woofer mounting depth: 2-1/16"
  • grilles included
  • warranty: 1 year
  • Our 60-day money-back guarantee

What's in the Box:

  • 2 Woofers
  • 2 Tweeters (each has attached 6" speaker leads)
  • 2 Woofer grilles
  • 2 Grille frames
  • 2 Crossovers
  • 2 Plastic mounting rings (Chrysler/GM/etc.)
  • 2 Tweeter flush-mount housings
  • 2 Threaded flush-mount adapters
  • 2 Plastic locking nuts
  • 2 Tweeter surface-mount housings
  • 2 Starfish tweeter mounts
  • Eight 1-3/8" Screws
  • Sixteen 1-1/8" Screws
  • 8 Speed clips
  • Six 5/8" Flat head screws
  • 2 Washers
  • 2 Nuts
  • 2 Adhesive backed foam gaskets
  • 2 Infinity logos
  • Instruction manual
  • Template on box

These are very nice but the directions are horrible.

Anonymous, Hermitage, PA


Infinity Reference REF-6520cx Reviews

Average Customer Review(s):

(47 Reviews)

Infinity Reference REF-6520cx

Anonymous from Hermitage, PA on 5/28/2018

2012 Chevrolet Silverado 2500/3500
Crutchfield Customer Review (What's this?)

These are very nice but the directions are horrible.




Chad from West Chester, OH on 5/13/2018

2016 Chrysler 200
Crutchfield Customer Review (What's this?)

Great, I ran all infinity speakers in my 2016 chrysler 200s. They for perfect with amiable tweeters. I used 6x9 baffles and then 6.5 inch baffles over the woofer. I also doubled up the speaker mounting bracket. My complaint is Crutchfield said these would not fit. They fit prefect with no modification.

Pros: Amiable tweeters.

Cons: Cross over could be smaller.

Great sounding

Wes from Burlington, KY on 5/6/2018

2008 Honda Civic LX
Crutchfield Customer Review (What's this?)

While component speakers may take more time and thought to install, these were definitely worth the extra effort. The detail and imagery is impressive, with clear, but not harsh highs and prevalent midrange. Also, bass response down to about 50Hz is clear and assertive. Overall, this is a great pair of speakers. Installed two pair (front and back) using amplification from high quality head unit (JVC V820BT) at 22w/channel. The speakers are sensitive enough to play well with low power. Would love to hear these speakers with dedicated amp in the 50w-70w/channel range! Crutchfield install kit was invaluable!

Pros: Build quality Sound quality Components! Need little EQ - sound great flat Infinity provides multiple install options for tweeters

Cons: Tweeter wires have spade terminals which have to be removed to splice or go directly into crossover. None others . . .

Infinity Reference REF-6520cx

Anonymous from Pensacola, FL on 4/30/2018

2016 Nissan Titan XD
Crutchfield Customer Review (What's this?)

Sound great. Replaced stock speakers as well as added amp and JL Audio sub. Couldn't be happier with my purchase.



OK in Tacoma P/U

J M from Houston, TX on 4/30/2018

2012 Toyota Tacoma
Crutchfield Customer Review (What's this?)

The Infinity REF-6520cx set up sounds fine in my Tacoma with Pioneer AVH2800BS headunit (w/o external amp).... but not that great. I replaced the 5 year old OEM speakers. The Infinitys are crisper and offer more bass... but for my 60 year old ears and classical music tastes, probably not worth the cost and trouble I went through to install.

Pros: Crisper highs, lower bass than OEM speakers.

Cons: ... but shouldn't they?

Infinity Reference REF-6520cx

Anonymous from Lehigh Acres, FL on 2/2/2018

2014 Toyota Tacoma
Crutchfield Customer Review (What's this?)

Great sound and good power

Pros: Good quality speakers excellent sound

Cons: None

Amazing and easy upgrade!

Adam from Folsom, CA on 1/9/2018

2005 Toyota 4Runner
Crutchfield Customer Review (What's this?)

For the price, I have gravitated towards Infinity separates in previous vehicles, and finally made the move to replace all of my factory 4Runner speakers with Infinity Reference speakers. The install was a bit more complicated in the 4Runner because I had to make custom tweeter mounts for the front doors (which I made out of a snowboard wax scraper, and just cut out from tracing the stock tweeter mount), and carve a bit of door panel away due to the location I chose for the crossover. I am powering them with an Alpine KTP-445, which made an impressive impact from the head unit power. In my opinion, the sound is as great as you can get for the money, and Infinity has their great reputation for a reason. Crutchfield also supplies most installation pieces, which, aside from their customer service, one of the reasons I shop from them.

Pros: Amazing sound and upgrade from factory speakers Price is great

Cons: Being separates, a little more difficult to install, but totally doable at home.

Infinity Reference REF-6520cx

Clemons from Warner Robins, GA on 1/5/2018

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

Great highs and mids. Sound much better given more power with aftermarket amplifier!



Excellent upgrade from factory

Jeffrey from Alpharetta, GA on 12/27/2017

2013 Ford Focus
Crutchfield Customer Review (What's this?)

Reference series has been the standard for many years and for good reason. These things are a huge step above OEM speakers, even over Sony's "premium sound". I'm pretty sure the woofers louder than the factory sub too. Louder, cleaner, no dead spots in the frequency range. I couldn't ask for more.

Pros: Clean sound Deeper bass


Infinity Reference REF-6520cx

Leon from Sumter, SC on 12/26/2017

2015 Ford Focus
Crutchfield Customer Review (What's this?)

Crisp and clean sound!



Infinity Reference REF-6520cx

Anonymous from Crown Point, IN on 12/25/2017

2004 Nissan Pathfinder SE
Crutchfield Customer Review (What's this?)

Beautiful sound. Very clear.



Infinity Reference REF-6520cx

Mark from West Memphis, AR on 12/19/2017

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

Speakers where a huge upgrade over stock, very clear and good mid bass..

Pros: Easy to install.. very clear

Cons: Could use a amp

Infinity Reference REF-6520cx

Anonymous from Spring Hill, TN on 12/14/2017

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

Awesome sound even better when paired with my Alpine MRV-V500 amp.



Infinity Reference REF-6520cx

JD from Wadsworth, OH on 12/14/2017

2014 Ford Fusion
Crutchfield Customer Review (What's this?)

Can't do a full review on product my kids are giving me these speakers for Xmas. Plus I live in the snow belt and won't be able to install them till spring. But all the installation guide and packaging excellent



Excellent product - sound and quality

Michael from Erie, PA on 12/13/2017

1993 Nissan 300ZX
Crutchfield Customer Review (What's this?)

Great quality item, looks good and sounds great. Wish I would have done components years ago, and planning on doing another set on my other car

Pros: Great sound mods and highs. Great looking. Can handlea decent amount of power

Cons: Need an amp Could be better lows but ok

Great set of speakers

Young from Los Angeles, CA on 12/12/2017

2005 Chevrolet Colorado
Crutchfield Customer Review (What's this?)

Installed it the front doors of my 2005 Chevy colorado. The sound off of these are notably superior to the factor speakers. They include mounting brackets in the box but they do not include any speaker wires. I drill extra holes in my door to attach the speaker as these are not direct replacements. Luckily I had some extra 16 gauge Rockford speaker wire. I have these running off a Pioneer 4200 NEX. Although the sound quality is decent these speakers from the Pioneer headunit they need an external amp to power them properly. I like the additional +3db but I forgot to press the button for driver side so I had to remove the entire door panel to push in the button on the crossover. The crossover is quite large. High's are crisp but mids are lacking, again you need to power these properly and not from a headunit. Distorts at about 27 volume level on the 4200nex. Crutchfield included a set of GM harness adapters whiched worked perfectly with these speakers. You will need extra speaker wire and connectors to complete this install. Overall I am pleased with purchasing these. I got them as a Cyber Monday deal with the matching 6 1/2 coaxial for the rear. Arrived in three days to Los Angeles via UPS. Next project is to buy a 4 channel amp with at least 75watt RMS to power these bad boy properly.

Pros: Price, Highs

Cons: Mid bass, lack of speaker wires, large crossover

Infinity Reference REF-6520cx

Anonymous from Smithfield, RI on 12/11/2017

2006 Chevrolet Silverado 2500/3500
Crutchfield Customer Review (What's this?)

Awesome product Easy install



Infinity Reference REF-6520cx

Anonymous from Fort Collins, CO on 12/10/2017

2010 Chevrolet Express
Crutchfield Customer Review (What's this?)

Good sounding speakers, definitely a step up from factory. Using an after market pioneer deck, I think these speakers would sound a lot better with more power.



Better then the Factory speakers on an Audi

Josh from Salado, TX on 12/8/2017

2012 Audi A6
Crutchfield Customer Review (What's this?)

I used these to replace a blown factory door speaker in a 2012 Audi A6. They were so much better then the stock 10 speaker system that I bought a second set and replaced the rear door components, and then bought a Reference 10 to replace the rear woofer. I will warn you that the passive crossover is large and it wouldn't fit between the door panel and door surface since the Audi's door panel is cluttered. I had to run the wires then used double sided Automotive tape and put it inside the door. (hope it holds)

Pros: -Runs well on low wattage factory Amp.

Cons: passive crossover is large

Infinity reference

Rasta from Silver Spring, MD on 12/8/2017

2000 Chrysler LHS
Crutchfield Customer Review (What's this?)

Where do I start? ok I have 6/12 infinity on my doors then I saw the component that I have been wanting for on sale. Thanks to Crutchfield and Hoop there it is I got em. For the quality of sound amazing as usual infinity speaker rocks.. six by mines in the back and now components in the front as for the 6/12 maybe q box. Good well made what you waiting on call Crutchfield....

Pros: Well made

Cons: None

Infinity Reference REF-6520cx

Anonymous from Austin, TX on 12/1/2017

2016 Toyota Tundra
Crutchfield Customer Review (What's this?)

Overall good speakers. Crisp and clear with good high range.

Pros: Good highs. Well matched with mid range


great overall sound

Jose from La Quinta, CA on 11/24/2017

2010 Honda Accord
Crutchfield Customer Review (What's this?)

great sound

Pros: The highs are just right


Honda Civic Front Doors

Steve from Rogers, AR on 8/11/2017

2015 Ford F-150 XLT
Crutchfield Customer Review (What's this?)

Great sound with the woofer in the bottom of the door and the tweeter in the top of the door in my Honda Civic! Disappointed only in the lack of wiring connectors. Had to cut up the speaker harness and solder my own wiring. Did I mention these sound great with my factory radio and no amp?

Pros: Sound quality!

Cons: Wiring harness blues

Infinity Reference REF-6520cx

Ronald from St Louis, MO on 8/8/2017

2015 Chevrolet Colorado
Crutchfield Customer Review (What's this?)

factory bose was better! adviser recommended a product that would work in a bose factory system!



Crutchfield response on 8/16/2017 Ronald, we're sorry you're disappointed with your speakers. Whenever you are not completely satisfied with anything you purchase from Crutchfield, please contact our Customer Support team at 1-800-955-9091. Purchases from Crutchfield can be returned or exchanged within 60 days of the purchase.

Infinity Reference REF-6520cx

Anonymous from Indio, CA on 7/30/2017

2010 GMC Sierra
Crutchfield Customer Review (What's this?)

great speaker. just using pioneer deck without amp and it sounds awesome



Infinity Reference REF-6520cx

mark from hiram ga on 7/26/2017

1999 Ford F-250 Super Duty
Crutchfield Customer Review (What's this?)

Great. I love them.



Infinity Reference REF-6520cx

Anonymous from Englewood, CO on 7/23/2017

2003 Jeep Liberty
Crutchfield Customer Review (What's this?)

Great price with amazing sound and would do again in a heartbeat



Brilliant Detailed Sound!

Joe from Dayton, NV on 7/22/2017

2010 Toyota Tacoma
Crutchfield Customer Review (What's this?)

Replaced the stock JBL speakers on my 2010 Tacoma with these. I installed them in the front doors, along with Dynamat to compliment the sound. I installed the crossovers next to the amp behind the rear seat. Sound is crisp and detailed. I set the crossover switch to 0db, as the +3db setting was too bright. Tweeters are still a little bright and required a little EQ to get them sounding just right.

Pros: Great build quality, Detailed Sound.

Cons: Tweeters are a little bright and required some tuning.

Great product, greater CUSTOMER service

ALMIN from Minnesota on 5/10/2017

2011 Volkswagen Jetta
Crutchfield Customer Review (What's this?)

Deliver Infinity's signature sound in a vehicle . tweeters smooth, clear highs and the larger models offer an adjustable tweeter output level control for optimization based on installation location. Great customer service, recommended



Crisp and Clean...Lacks low-end

Ryan from Prairie Village, KS on 4/27/2017

2017 Jeep Wrangler Unlimited
Crutchfield Customer Review (What's this?)

Overall these component speakers are crisp, clean, and deliver excellent quality sound. The sound is bright and smooth and has excellent frequency range. I was quite amazed at the degree of tuning these speakers could handle; especially when tuning the audio for a 2017 Jeep Wrangler Unlimited. The only downside to these speakers was the quality of low end. When paired properly with a sub woofer it's hardly noticeable; however, on their own I'm not impressed with the low end frequencies or lack thereof.

Pros: Crisp, Clean and high degree of tuning

Cons: Woofers lack low end oomph.

Infinity Reference REF-6520cx

Richard from Silverton, OR on 3/5/2017

2016 Subaru Forester
Crutchfield Customer Review (What's this?)

Great speakers. Be patient with the mid-range, they take a little while to break in. The will seem a little brassy right out of the box but will settle in after 10 hours or so. They are even better if you have the ability to eq them.



Infinity Reference REF-6520cx

Jesse from Salina, KS on 2/13/2017

2002 GMC Yukon XL
Crutchfield Customer Review (What's this?)

Packaging is very good. Tweeter comes with multiple mounting options. Crossover is simple to hook up. little big but fits in map holder door pocket. Sound is clean and crisp. Does ok on bass notes for being a small speaker but focuses on mids to highs. Over all good speaker for the price.

Pros: Clean crisp sound. Multiple mounting options for tweeter.

Cons: Crossover a little big but does look good if visible. Wish woofer screen was not so bulky.

Infinity Reference REF-6520cx

Mr. Sound from Fort Myers FL on 1/7/2017

Almost as good as the Kappa's. Tune right with amp sound great. Paired up with Rockford 5 channel with 6.5 coaxial in rear. Rock style quality!

Pros: Tuned right they sound good with nice mids!

Cons: Crossover tad big to mount and tweeter only has 6inch speaker length.

Infinity Reference REF-6520cx

Anonymous from Arlington, TX on 12/25/2016

2004 Dodge Dakota
Crutchfield Customer Review (What's this?)

Good improvement over the stock speakers. Mid-range is not that impressive (the main driver covers both bass and mids), use of an EQ to bring the mids in helps significantly. Gave it 4-stars because there's always something better out there, just maybe not as economical.

Pros: Good value for the price.

Cons: Installation is going to take a while. The crossover box is pretty big and takes up a lot of room (which most door panels don't have a lot of). Installation hardware (screws) was lacking, but nothing that a run to the local hardware store won't fix.

Excellent Value. Great performance. Superior Crutchfield Support

Anonymous from Fountain Hills, AZ on 12/24/2016

2000 Toyota 4Runner
Crutchfield Customer Review (What's this?)

First the speakers...then the installation... The speakers are great. Very good value. The tweeters have a surprising amount of sound coming out of them. The highs where what I was shooting for, but a lot more comes out of them. Impressive. The lows that come out of the 6-1/4" speaker are equally impressive. This speaker truly gives a full spectrum of sound. No complaints. As for the installation. Regardless of your car, be aware that the crossover box is quite large. Check the specs and understand the size will limit the places it can/will go. I ended up having to install it inside my car door storage pocket by my ankle. This was less than idea, but it worked. Sound quality considering the value of these speakers is a 5 or of 5 stars. Overall its a 4 out of 5 because of the huge crossover. Crutchfield is off the chart. This company is amazing to work with, they are 10 out of 5 starts. I installed these into a 2000 Toyota 4Runner (front doors).

Pros: Excellent value. Wide range of clear highs. Very good lows and even a bit thumpy!

Cons: Crossover is very large and will make installation more difficult and limit where you can put it. With enough motivation, you'll find a way. Good luck.

Infinity Reference REF-6520cx

Anonymous from Wapakoneta, OH on 12/15/2016

2015 Honda Civic SI
Crutchfield Customer Review (What's this?)

Sound great, made well. Installed in a 2015 Civic SI in the back deck. Said they would fit but I had to modify the Trunk lid springs for clearance. Magnet is much larger than factory and the springs caught on them.



Infinity Reference REF-6520cx

Gerardo from El Paso, TX on 12/12/2016

1997 Nissan 240SX
Crutchfield Customer Review (What's this?)

Great upgrade! Fits a 1997 240sx s14 kouki. Of course you have to figure out where to put your tweeters, obviously don't put them in the door vents or hang them. Mounted mine securely on A Pillars.

Pros: Great sound all around even if you just have a aftermarket radio with no amp.

Cons: None

Infinity Reference REF-6520cx

Monty from Sweeny TX. on 12/10/2016

2009 Infiniti G37
Crutchfield Customer Review (What's this?)

Great speakers

Pros: Sounds great

Cons: None

Infinity Reference REF-6520cx

Anonymous from Houston, TX on 12/8/2016

2015 Honda Accord
Crutchfield Customer Review (What's this?)

Awesome product.. sound really good



Infinity Reference REF-6520cx

Kevin from Westland, MI on 11/29/2016

1997 Ford Escort
Crutchfield Customer Review (What's this?)

i had Infinity Reference 6022i speakers before and upgraded to these after 5-6years+, and they sound waaay more clear. partly because the tweeter is mounted up higher now and not down low on the door. they also seem to handle slightly more power compared to the others that were 2.4ohms, these are 3ohms, but higher rms and you can hear it. running them with a Kenwood KAC-8401 amp and 12 awg speaker wire. also when i bought them they weren't on sale, they went on sale like two weeks later, i called Crutchfield and they quickly refunded me the difference so of course i got another pair after that. now my brother wants a pair lol

Pros: lots of tweeter mounting options, infinity logo is an optional sticker to put on the tweeter also. i like them without the logo.

Cons: wish they came with terminal crimp ends for the mid/tweeter to make the installation easier.

Sound great

Chad from Portsmouth, OH on 10/26/2016

2012 Honda Civic EX
Crutchfield Customer Review (What's this?)

These sounds great. Put in the front doors of a 2012 civic non premium sound and man what an improvement, I'm using factory nav unit with Nikki amplifier. I couldn't be happier.



Infinity Reference REF-6520cx

Anonymous from Manassas, VA on 10/11/2016

2011 Ford F-150 Lariat
Crutchfield Customer Review (What's this?)

Have used Infinity in many other vehicles and have never been disappointed. The trend continues. Replaced the factory dull sounding speakers in my F150 and what a difference! Fantastic sound with clear highs and decent lows. Not that brain numbing bass some might need, but good quality deep tones. Install was a breeze with the Crutchfield adapter and wire harness. To make your factory Ford head unit sound good and not loose the features, this is the easiest and best way.

Pros: High quality sound and easy install.

Cons: None for me

Crisp and Clear

Edward from Hemet, CA on 10/3/2016

2014 Jeep Compass
Crutchfield Customer Review (What's this?)

Love these speakers. I am really picky when it comes to speaker. I love my Vocals but, want all the frequencies to be present. These give me what I want. Super clear Vocals and Full Frequency response at reasonable Volumes. These speakers sound great at all volumes from soft to very loud.

Pros: Clear Vocals, Great Frequency Response

Cons: None

Great speakers

Justin from Roseau, MN on 9/15/2016

2009 Chevrolet Silverado 1500
Crutchfield Customer Review (What's this?)

I love these speakers. This is the second set of infinity reference components that I've owned. These speakers take a beating and keep I going! They don't put out bass like a subwoofer does, but the bass is pretty good once you dial it in. I would buy these again and i definitely would recommend these to a friend.

Pros: Clear accurate sound. Can get loud.

Cons: None

Infinity REF-6520cx

Frank from Dededo, GU on 7/28/2016

2010 Toyota Tacoma
Crutchfield Customer Review (What's this?)

Infinity are always reliable speakers.

Pros: None

Cons: None

Improved the sound

Lou from Walnut, CA on 7/23/2016

2013 Honda Accord
Crutchfield Customer Review (What's this?)

This set of speakers improve the sound hey my stock car tremendously. In this model of Honda accord it is not possible to replace the radio. But, by changing these speakers I was able to get a much better sound for my ride.

Pros: Clean install

Cons: None

Infinity Reference REF-6520cx

William from Woodinville, WA on 7/4/2016

2013 Smart fortwo
Crutchfield Customer Review (What's this?)

Speakers almost fit my Smart Car perfectly. Enclosed adapter plate made them fit . Sound is very clear and crisp. Using a Blaupunkt receiver and Sony amplifier.




Hands-on research

Features and Specs

Speaker Size 6 1/2
Design 2-way
Tweeter Design 3/4" Edge-Driven Dome
Impedance (Ohms) 3
Tweeter Composition Textile
Woofer Composition Polypropylene
Woofer Surround Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Sensitivity (1W at 1 meter) N/A
Sensitivity at 2.83 volts 93
Frequency Response 53 - 21k Hz
Minimum RMS Wattage ---
Maximum RMS Wattage 90
Peak Power Handling (Watts) 270
Top-mount Depth (Inches) 2 1/16
Bottom-mount Depth (Inches) N/A
Cutout Diameter or Length (inches) 5 1/8

Product Research



Plus One+ Woofer Cones: Each speaker uses a larger cone 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 an 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 6520cx woofers fit standard 6-3/4" applications. Given their required cutout, they will also fit 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: 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.


  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 0.862" 0.654" 0.0" 0.857" 0.386" 0.286"
Depth screw depth 0.820" 0.930" screw depth 0.471" 0.571"
Frame Diameter 1.478" 1.840" 3.036" 2.440" 2.330" 2.330"
Cutout Diameter N/A 1.580" N/A N/A 1.504" 1.257"


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 0.31" wide. There are four mounting holes in each crossover.


  • Width: 4"
  • Height: 1-1/8"
  • Depth: 3-1/4" (plus wire)


High-Output Design: The 3Ω voice coil design compensates for the high in-line resistance of small gauge factory wiring, extracting more power from factory (or aftermarket) receivers. This results in clearer, richer sound for the listener.

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.

Staff Reviews

Product reviews from the Crutchfield Labs

Infinity Reference REF-6520cx component speaker system

Written by Duffy, Advisor, on 11/7/2016 4:46:00 PM
This component system far exceeded my expectations. Paired with my factory radio and the Infinity Kappa K5 amplifier, the woofers deliver a surprising punch while maintaining the smooth and true highs that I was aiming for. I was worried that the tweeters would be a little too harsh for my taste, but thankfully, this wasn't the case. The dome tweeters allowed me to discover details in my music that I had never before noticed. I really love that this component system brought out the vocals in my music without having to sacrifice the full range of frequencies found in the body of the music.
What are the Labs?
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

I wanted clear precision sound, and from researching the other reviews. The price and reviews made the decision easy. [ David Christope  Jan 23, 2018 ]
They should fit the 2002 Mini Cooper with little to no modifications and the price on sale was attractive. [ Ricardo  Nov 28, 2017 ]
after working with quinn she helped me choose speakers that would compliment what i was looking for in an audio system [ meagan  Nov 28, 2017 ]
Good specs and a Black Friday deal. [ MICHAEL  Nov 25, 2017 ]
Price and recommended by rep. [ TROY  Nov 25, 2017 ]
Great value. [ Christopher  Nov 24, 2017 ]
I have been using infinity speakers for my highs and mids for most of my cars and the clarity is amazing regardless if am running four subs you still hear the treble and midrange perfectly fine.. The Twitters are not harsh and the mids don't scream either just sweet music to my ears.. that's all I got to say about that. [ STEPHEN  Nov 24, 2017 ]
Great reviews from friends [ Colin  Nov 24, 2017 ]
Replacement for 2000 4Runner front [ William  Nov 23, 2017 ]
Infinity is my brand of choice [ Richard  Nov 23, 2017 ]
Love Infinity products. Best speakers I have ever used!! [ David  Nov 04, 2017 ]
Hopefully fits well [ Bret  Jul 05, 2017 ]
Infinity has familiar and predictable sound quality and I prefer their textile tweeters [ Steven  Jun 19, 2017 ]
High sensitivity to squeeze a little more performance out of my OEM source unit. Overall positive reviews from other Crutchfield customers. [ Kyle  May 11, 2017 ]
was recommended. [ Joseph  May 03, 2017 ]
Quality of sound and craftsmanship... Good price [ Jaisiel  Feb 21, 2017 ]
great price and they are now installed and sound phenomenal [ JAMES  Jan 13, 2017 ]
was an offer I could not refuse I am a JL audio guy but the price for quality could not be beat so I will give these a try [ COURTNEY J  Nov 26, 2016 ]
they sound good, and the price was awesome [ Paul  Nov 25, 2016 ]
They were on sale at an incredible price. I've owned Infinity Reference Component speakers in the past and have been very satisfied with them. As an added bonus, these components are 3 ohm speakers so they should work very well with my factory head unit until I choose to upgrade the head unit. [ Robert  Nov 25, 2016 ]
i want clear sound in a speaker my girlfriend cant blow [ joseph  Sep 30, 2016 ]
it was a recommendation made from the sales person [ isaias  May 29, 2016 ]

4 questions already asked

no, per speaker. i am pushing about 100rms into mine with a 160hz hpf on a 24db slope [ Kevin666  Jul 04, 2017 ]
Works fine with my GMC pick-up, but based on the junk that i pulled out of my front doors, an upgrade would be wise. you could do it in stages if you want. [ JOHN  Oct 11, 2016 ]
I wondered the same thing but after reading various Crutchfield guides I found that the sensitivity of 93 dB makes these speakers work well for factory units and you can also upgrade later with an amp if you like. My setup sounds great with just a factory deck! Very crisp sounds and some bass but not ear drum shattering like you could get with an amp. Overall very happy. [ Joe  Oct 11, 2016 ]
While not absolutely necessary, in order to really take advantage of the great sound these are capable of providing, it is highly recommended. A stock receiver probably would not handle it well; an aftermarket receiver with a higher output might provide decent sound and could be hooked up in the short term while you shop/save up for an amp; but for the long term/permanent solution, an amp would really bring these speakers to life. Best of luck. [ Jeremy  Oct 10, 2016 ]
I would use and amp to run these speakers. [ Cole  Oct 10, 2016 ]
Anywhere 16-18 gage will do the trick. [ Austin  Sep 17, 2016 ]
You can use a range of 12-14 gage to the Amp. [ Donald  Sep 15, 2016 ]
I used 14awg wire for my set up. I'm using a 45w RMS x4 amp [ Eric  Sep 13, 2016 ]
It depends on how big of an amp, quality 16 gauge is usually fine but some people like 14 for higher power handling. [ Promit  Sep 13, 2016 ]
I didn't end up installing the Infinitys, exchanging them instead for Focals that worked with the factory wiring for my 2000 Jetta. My general response though would be to use quality wiring sized to fit your connectors properly both at your source unit and the speakers and that you will be able to successfully dress in the space available in the car. I don't think gauge or quality needs to be excessive in the car because it is a high background noise environment with limited space to dress cable properly and subtleties of high end cables will probably be lost. [ Eric  Sep 13, 2016 ]
Chris, It really depends on how much wattage you planning on sending to each speaker but I wouldn't use anything smaller than 14 gauge. If you are planning on any later upgrades or adding a subwoofer I would recommend a minimum of 16 gauge to minimize resistance. Hope this helps you! [ David  Sep 13, 2016 ]
Depends on the length of your run. Google it! [ Adam  Sep 13, 2016 ]