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Polk Audio DXi651

6-1/2" 2-way car speakers — also fit 6-3/4" openings

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  • Polk Audio DXi651

  • Polk Audio DXi651

Item# 107DXI651
 

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Our take on the Polk Audio DXi651

by John Pollard
Polk Audio

Why replace your car's original speakers?

The speakers that originally came in your car were made from inexpensive materials, designed to create acceptable sound at the lowest possible cost to the manufacturer. If you love music, you deserve better. Name-brand aftermarket speakers deliver fuller, richer sound with considerably more detail and nuance, and they're capable of playing louder and cleaner than factory speakers. Connect new speakers to your factory radio and you'll get the best possible sound from your dealer-equipped system. Pair them up with a new car stereo for a level of enjoyment that can rival a high-fidelity home audio experience.

Enjoy your music even more

Go ahead, circle the parking lot till your favorite song is over. Polk Audio's DXi Series speakers will make you want to hit "repeat" so you can hear it all over again. Polk uses a high-tech approach and ideal materials to give your tunes an exciting new edge.

Precision woofers showcase your music

The DXi651 speakers feature 6-1/2" polymer composite cones that are lightweight and stiff, so they can create a big sound with minimal distortion. Polk analyzes their drivers in motion to ensure that cone movement is even and precise. Polk also uses laser imaging to craft woofer cones that are perfectly balanced to resist distortion-causing resonances.

Polk Audio DXi651

Aluminum dome tweeters broadcast detailed sound

Each 3/4" aluminum dome tweeter brings out the high-frequency highlights in your music, so you'll hear every detail of your most enthralling musical moments. From an intensely quiet acoustic pluck to the most exhilarating electric solo, it'll be a very entertaining ride.

Highlights:

  • 6-1/2" 2-way car speakers (pair)
  • supplied adapter rings allow for fit into 6-3/4" locations
  • polymer composite woofer with butyl rubber surround
  • 3/4" aluminum dome tweeter
  • power range: 6-60 watts RMS (180 watts peak power)
  • frequency response: 35-22,000 Hz
  • sensitivity: 92 dB
  • top-mount depth: 2"
  • warranty: 1 year
  • Our 60-day money-back guarantee
 

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
General
Design
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2-way
Tweeter Design
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3/4" Dome
Tweeter Composition
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Aluminum
Woofer Composition
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Bi-Laminate Composite
Woofer Surround
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Rubber
Parts Warranty
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1 Year
Labor Warranty
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1 Year
Specifications
Sensitivity
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92 dB at 1 watt
Frequency Response
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35 - 22k Hz
RMS Power Range (Watts)
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6-60
Peak Power Handling (Watts)
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180
Impedance (Ohms)
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4
Top-mount Depth (Inches)
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2
Bottom-mount Depth (Inches)
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N/A
Cutout Diameter or Length (inches)
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5
Product Research
What's in the box?

Download owner's manual

  • Two 2-way speakers
  • 2 Grilles
  • Eight 1" Self-tapping screws
  • Eight 3/8" Self-tapping screws
  • 8 Speed clips
  • 2 Spacer/Adapter brackets
  • 2 Foam rubber gaskets
  • Owner's Manual (English/ Spanish/ French/ German/ Italian/ Portuguese)
  • Online product registration information

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.

Features

High Efficiency Design: The Polk Audio DXi Series speakers feature a high efficiency design; meaning better sound and more volume using less power.

Dynamic Balance Driver Technology: Dynamic Balance is a proprietary Polk Audio technology using laser imaging to determine what combination of speaker materials create the least amount of resonance. Eliminating resonance in speakers results in a wide, smooth response and low distortion.

Klippel Optimized Components: For a driver to reproduce complex sounds accurately, the cone must move exactly the same distance and manner in both directions. The Klippel distortion analyzer, a device that uses a laser and sophisticated software to do large-scale analysis of drivers in motion, lets Polk optimize the speaker's motor structure, voice coil alignment, and suspension to yield the best possible performance.

Composite Cones: Each speaker features a Dynamic Balance, Bi-Laminate composite, polypropylene cone woofer. These composite cones feature tremendous stiffness-to mass ratio, resulting in faster transients and finer detail.

Rubber Surrounds: For a smoother response and improved durability, the speaker uses rubber surrounds.

Aluminum Dome Tweeters: Each speaker features a 3/4" aluminum dome tweeter for clear, accurate highs. Once the speakers are mounted, the tweeters can be tilted (approximately 25°) for optimum imaging.

 
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Polk Audio DXi651 Reviews

Average Customer Review:

24 people say:

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5 out of 5

They sound great

Written By Disco bob, Thornton co on Sunday, April 20, 2014
 
Not much to say here, great speaker looks like materials will last. Wish I had an amp running them but they still sound great from deck power.

Pros:
Wonderful, crisp and sound awesome for the size:)
Cons:
Once again this is cosmetic and 80% won't even use the grills...Square grills, under tight quarters this can be tough to get them straight on rear decks, the mount hole ends up so close to the window it is very hard to get a hole drilled and a screw mounted.
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1 out of 5

Not very good

Written By Lance7489, Lancaster, NY on Thursday, April 17, 2014
Crutchfield Customer Review (What's this?)
 
Very disappointed in these. The factory speakers in my 2013 Impala sounded much better. Very poor bass. I know you're not going to get much out of 6.5" speakers but these are not good. The 6.5" kickers I bought for my wife's Malibu were alot better. The cones on these are very stiff & just don't move enough air to generate satisfactory bass.
Pros:
Good highs & midrange.
Cons:
Again, poor bass response !!!!!!!
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5 out of 5

Great in my 06 avalanche

Written By Brian k, Okc on Sunday, April 06, 2014
 
Great clear crisp sound
Pros:
Fit factory insert Great bass and clarity plus used a 180 watt alpine pre amp
Cons:
None
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2 out of 5

not what i was expecting

Written By matt, nc on Sunday, March 23, 2014
Crutchfield Customer Review (What's this?)
 
I own a silverado and I wasn't expecting a lot I just wanted a little bit better then stock and little more bass and I know I wouldn't get a lot of bass cause its just a door speaker with no amp but I wouldn't really say it was much better then stock and the bass is pretty muddy and never clean in some bass heavy songs I pretty much need to turn the bass to a -6 because it sounds so bad and I keep the bass at 0
Pros:
fixed my busted speakers not really a pro but kind of
Cons:
not any better then stock
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4 out of 5

Polk Audio DXi651

Written By Blue nissan, Maryland on Sunday, February 23, 2014
Crutchfield Customer Review (What's this?)
 
Great sounding speaker
Pros:
Nice high and lows
Cons:
Should have added speaker wire
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5 out of 5

Great Fit & Great Sound

Written By Joe, Hudson, NH on Saturday, January 11, 2014
Crutchfield Customer Review (What's this?)
 
I purchased these Polk DXi651 to replace the speakers in the rear deck of my 2002 Honda Civic EX sedan. They fit perfectly in the rear shelf without any adapter brackets. I did have to drill 3 new holes but that wasn't difficult. This model of the Polk speakers was not recommended by the customer service reps at Crutchfield. The recommended speaker size by Crutchfield was 5 1/4" but I wanted to give these 6 1/2" a try anyway as I wanted a speaker that would provide a little more bass. These speakers have a great balanced sound and they do provide a decent bass response for my over 50 ears. I wasn't looking for the deep bass of a sub woofer just a well balanced sound and these speakers did not disappoint. This was my first purchase from Crutchfield and I am very satisfied -- they provided all the necessary accessories for the install at no extra charge and the installation instructions were very helpful.
Pros:
Great balanced sound. Perfect fit in the rear shelf of a 2002 Civic
Cons:
None
1 out of 1 people found this helpful
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5 out of 5

Quite the Upgrade

Written By MusicMan, Orefield,PA on Saturday, January 11, 2014
Crutchfield Customer Review (What's this?)
 
What an upgrade for my daughter's '99 Passat! And at a great price. I popped out the 4 stock door speakers and mounted these with ease. Matched up with a Sony MEX-BT4100P and Sound Ordnance 50W RMS amp these Polks are delivering clean crisp sound and with plenty of bass given their small size and disadvantaged mounting location. Although the bass is fine for this 50 year old, the kids love the boom so we threw in a Sound Ordnance 80W RMS powered sub in the trunk. Finally, kudos to the Crutchfield experience, all the right installation instructions and tools are always thoughtfully included.
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5 out of 5

polk coaxial

Written By Anonymous, aiea, hi. on Thursday, January 09, 2014
Crutchfield Customer Review (What's this?)
 
These are very good speakers. Crisp highs with clean bass. It was a big improvement over factory oem speakers. They are well made and durable. I'm very pleased with thier performance.
Pros:
Reasonably priced, well made and aesthetically pleasing.
Cons:
None
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4 out of 5

Polk Audio DXi651 Speakers

Written By danF, Charlotte, NC on Friday, December 20, 2013
Crutchfield Customer Review (What's this?)
 
Great sound once i learned the Alpine receiver adjustments. Origninally installed with factory 18w and now with Alpine power pack at 45w.
Pros:
Good sound. Reasonable price.
Cons:
Had to play with template for door mounting, too long. Bigger diameter / longer holes required for my 2002 Nissan Frontier.
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5 out of 5

Polk Audio Speakers

Written By Mike, Mountain Home AR on Friday, November 15, 2013
Crutchfield Customer Review (What's this?)
 
Installed them on a 2008 Chevy 2500 HD crew cab on the back doors. High quality speakers and the brackets and wire harness made installation a breeze. The bracket clips did have be modified slightly by grinding off the edges just a little.
Pros:
Great product and service from Crunchfield. Also good price...
Cons:
None
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5 out of 5

Quality sound

Written By Scott, Ocean city, nj on Wednesday, October 30, 2013
Crutchfield Customer Review (What's this?)
 
Quality sound, makes the head unit sound so much better, They replaced cheaper aftermarket speakers
Pros:
Great sound Great price for the quality of the speakers Crutch field delivers
Cons:
None
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5 out of 5

Great sound, easy install

Written By Jeff, Frisco, TX on Monday, October 28, 2013
Crutchfield Customer Review (What's this?)
 
installed all 4 speakers in the doors of my 08 Sierra. for some reason, all door speakers went out but from what I have heard, sounds common in the Sierra/Silverado. You can install these yourself, don't take to a shop. Honestly, the hardest part is getting the door panel off. the speakers sound great...I think anything would sound better than stock though! Nice base (better than stock). Supplied mounting brackets and speaker harness worked like a charm. I think total install took a couple of hours.
Pros:
great sound, easy install
Cons:
none for now
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4 out of 5

Improvement over OEM

Written By CC, Birmingham, AL on Tuesday, October 15, 2013
Crutchfield Customer Review (What's this?)
 
I used these Polks to replace my original speakers in my 2008 GMC Sierra crew cab. Definite improvement over stock speakers. For a 6.5 speaker these have really good bass. They do not deliver the mid range sounds as good as I would like, even after adjusting the EQ (stock radio). I may be picky but that is my only reason for 4 stars. I saw these speakers at Best Buy for comparison, got a better deal from Crutchfield. Getting free install equipment saved me about $55 for four speakers, way to go Crutchfield!!
Pros:
Full sound, good bass, FREE install equip(speaker bracket and wiring harness needed for my vehicle), plenty of mounting options, easy to install
Cons:
Mid range sounds lack a little for my taste
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5 out of 5

Awesome buy!

Written By ScottS, Clarksville, NY on Wednesday, September 18, 2013
Crutchfield Customer Review (What's this?)
 
Outstanding sound and very easy install. Will be buying these for the rear doors of my '08 Sierra very soon.
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5 out of 5

Excellent sounding, plenty of mounting holes

Written By M_D_B, Parma, OH on Wednesday, August 21, 2013
Crutchfield Customer Review (What's this?)
 
Very simple: these speakers sound great, have better low-end than I expected, and provide lots of mounting holes for various applications. Love 'em.
Pros:
Easy to mount, very good low end, tweeters can be tilted towards listener (slightly.)
Cons:
None.
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5 out of 5

Polk Audio DXi651

Written By PlanetKiller, Aloha, OR on Tuesday, August 20, 2013
Crutchfield Customer Review (What's this?)
 
I installed these in the rear doors of my 2006 Ram2500. Fit nicely but I did need to drill new holes to mount them. Very nice sound. Really surprising when compared side by side with the stock ones, both looks and sound. They hide behind the factory door panels and everything looks stock and clean. I am running the Alpine KTP-445 amp and it really woke them up!
Pros:
Good sound, east install w/ a few new holes.
Cons:
None really
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5 out of 5

A crisp speaker

Written By Mychal, Tampa, Fl on Sunday, August 18, 2013
Crutchfield Customer Review (What's this?)
 
After hearing many of the 6 1/2 speakers on this site (sony, rockford, infinity, kenwood etc) I can vouch for this polk speaker in saying it sounds pretty good hooked up to just an aftermarket radio. If you really want to hear it come to life then amp it. Overall a good sound for 75 dollars.
Pros:
Good mids and decent lows and highs
Cons:
Could be a little better highs and lows
1 out of 1 people found this helpful
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4 out of 5

Factory Speaker Upgrade

Written By Steve, Mount Pleasant, WI on Sunday, August 18, 2013
Crutchfield Customer Review (What's this?)
 
These speakers replaced my stock Bose front door speakers in my 2008 Chevy 2500HD. The quality is superior to the Bose speakers and the sound is more crisp.
Pros:
The sound quality is great, especially for the affordable price.
Cons:
none
3 out of 3 people found this helpful
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4 out of 5

Solid Speakers

Written By Matt, Tucson, AZ on Friday, August 16, 2013
Crutchfield Customer Review (What's this?)
 
I love these speakers, they really have that low range I was looking for. However I feel like it does kind of muddle the sound and I am currently running them without any extra amplification so in bass heavy songs they do kind of struggle a bit to still keep the entire sound together. But in all I would totally buy these again and recommend them highly, but I do feel these speakers were meant to be amplified.
Pros:
Bass response, sound clarity.
Cons:
The bass can overwhelm the speaker making the sound quality suffer noticeably. (could be more of a wattage problem on my end though so I am not entirely blaming the speaker!)
2 out of 2 people found this helpful
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4 out of 5

Great replacement speakers

Written By Schwipr, Milan, IN on Wednesday, August 14, 2013
Crutchfield Customer Review (What's this?)
 
Bought these to replace some blown factory speakers. Installation was easy and the sound quality was much improved. Great range on these. Very good speakers for the price.
Pros:
Great sound & value
2 out of 2 people found this helpful
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4 out of 5

Good for the price.

Written By Jimmy, Temple, Tx on Friday, July 26, 2013
Crutchfield Customer Review (What's this?)
 
These speakers provide good lows and highs. The midrange isn't particularly stron. But with the Helix PP50 added to the equation, the factory system rocks.
Pros:
Booming bass. Crisp highs.
Cons:
A little weak in the midranges. But overall, a good speaker.
2 out of 2 people found this helpful
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5 out of 5

perfect

Written By revheat, Soulsbyville, CA on Wednesday, July 10, 2013
Crutchfield Customer Review (What's this?)
 
Perfect
Pros:
Cant go wrong with polk
Cons:
None
1 out of 1 people found this helpful
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5 out of 5

Maxi Mini

Written By Dick, WA State on Sunday, July 07, 2013
Crutchfield Customer Review (What's this?)
 
Great range, nice base response and as these are installed in rear deck the tilting tweets work very well indeed.
Pros:
great value
Cons:
None
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5 out of 5

Amazing sound

Written By AntD, Tucson AZ on Saturday, July 06, 2013
Crutchfield Customer Review (What's this?)
 
My new Polk speakers have made a huge difference. They have excellent clarity and just enough thump! Couldn't be happier with my DXi651 speakers.
Pros:
Good hi's Good mids Good lows
Cons:
None
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