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Polk Audio DXi651s

6-1/2" 2-way shallow-mount car speakers

207 Reviews | 6 questions - 16 answers

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Our take on the Polk Audio DXi651s

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.

Polk Audio DXi651s

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 DXi651s 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. Also, the speaker frame's just under 2" deep with a mounting height of under 1/2", so you can install them in many space-challenged vehicles.

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.

The sound that the Polks put out. Makes the stock speakers sound weak. Im A happy camper.

Douglas, Hummelstown, Pa

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What's in the Box:

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

Product Highlights:

  • shallow-mount 6-1/2" 2-way car speakers
  • polymer composite woofer with butyl rubber surround
  • 3/4" aluminum dome tweeter
  • power range: 6-55 watts RMS (165 watts peak power)
  • frequency response: 50-22,000 Hz
  • sensitivity: 92 dB
  • top-mount depth: 1-15/16""
  • warranty: 1 year
  • Our 60-day money-back guarantee

Polk Audio DXi651s Reviews

Average Customer Review(s):

(207 Reviews)
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Hands-on research

Features and Specs

Speaker Size 6 1/2
Design 2-way
Tweeter Design 3/4" Dome
Tweeter Composition Aluminum
Woofer Composition Bi-Laminate Composite
Woofer Surround Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Sensitivity (1W at 1 meter) 92
Sensitivity at 2.83 volts N/A
Frequency Response 50 - 22k Hz
Minimum RMS Wattage 6
Maximum RMS Wattage 55
Peak Power Handling (Watts) 165
Impedance (Ohms) 4
Top-mount Depth (Inches) 1 15/16
Bottom-mount Depth (Inches) 2 5/16
Cutout Diameter or Length (inches) 5

Product Research


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.

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

Four popular car speaker lines
by Robert Ferency-Viars

We listen to Alpine Type-S, Polk Audio DXi, Infinity Reference X, and Rockford Fosgate Punch car speakers in the Crutchfield Labs.

What are the Labs?
Q & A

Customer Q&A

6 questions already asked

With your purchase from Crutchfield, feel free to contact our Tech Support team. They can walk you through the connections on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. [ Kenny  Apr 23, 2016 ]  Staff
I have my polk speakers hooked to a Kenwood KDCBT362U. They sound just fine for me without an amp. [ CHARLIE  Mar 13, 2016 ]
No you don't. I just run my speakers through my deck with stock wiring and they get plenty loud. [ PATRICK  Mar 12, 2016 ]
No sounds good on my stock radio [ ROBERT  Mar 12, 2016 ]
I put no more than a 100 watts on each speaker for the best performance. because if you try to put the peak power you will have a really bad sound. is my personal opinion. [ ROBERTO  Sep 23, 2015 ]
I believe it is 165 watts peak power. [ JOEL R  Sep 20, 2015 ]
These speakers have plenty of bass for my Honda Civic. I call the OEM speakers "Chinese Paper Plates". I put in an HD radio that can add a sub-woofer, but I don't really see the need, I'm pleased. [ GARY L  Aug 23, 2015 ]
the bass in these speakers are very good I had two other top brands put in and they did not produce the bass like the polks [ ANTHONY  Aug 21, 2015 ]
For door panel speakers it's fine. Still way better than factory speakers. [ ROSS J  Aug 20, 2015 ]
The DXI's are nice, I installed them in a Dodge Stratus SXT so take my opinion as such since they may sound different depending on your vehicles interior volume/acoustics. I am running them in the front doors with foam baffles and DXI 6x9's in the rear deck (both factory locations), and are powered only by the JVC Arsenal head unit. I tuned the EQ to my liking (also a variable to consider with your application) to play as loud as possible without distortion. The rear view mirror blurs from the bass! About the same as my friend's Chevy Lumina with a 10" Kenwood sub in his trunk (not sure amp/power)! The 6x9's in the rear deck are the reason for this I am sure (more air movement) but they sound clean! I would recommend them! I would also recommend the Polk DB's, which I installed four 6.5" DB's in a Jeep Grand Cherokee Laredo using the same model JVC head unit with the exception of adding a Polk DB dual enclosure with a Polk Amp powering them. With the amp off, they sound equally (if not better) than the DXI's. Though I can not truely compare as interior volume/accustics are different, and no 6x9's in the Jeep. [ JOEL R  Aug 19, 2015 ]
I put these speakers in a 2000 model super cab z-71 and I absolutely love them! The sound is very crisp and clear on the highs. I can't tell you much about the bass with them tho, I have a custom box and two tens under the back seat and is where most of the bass I hear comes from. My polks do a great job getting the lyrics out over the bass. Hope this info helps [ TIMOTHY  Aug 19, 2015 ]
The speakers have much better bass than the factory speakers in my 09 civic. That is the only comparison I have. I was not disappointed with the sound. Hope it helps. [ DANIEL  Aug 19, 2015 ]
It's good. But I need more power for system. [ JOSEPH  Aug 19, 2015 ]
These speakers sound really good but miss the very low end. You can't really expect it from a small door speaker. If you're looking for some thump and rumble adding a small powered subwoofer would make a great set up. [ THOMAS  Aug 19, 2015 ]
I installed in 2005 tacoma ,had to use a mount kit .install is always easy with crutchfeilds support sheets. Highly recomdended. [ LARRY  Aug 17, 2014 ]
Don, I have never installed these in your particular vehicle. That being said, if you do some research on how to access and remove the factory speaker, that should be all you would need to know I would think. Once you have access to the speaker for removal/install, its just 4 screws and a terminal to unplug. Get the speaker harness adapters for quick plug and play installation. Hope this helps a little. Best of luck to you sir! An excellent sounding speaker I might ad. [ AARON D  Aug 17, 2014 ]