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Polk Audio DXi651 (Factory Refurbished)

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

5 Reviews

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Item # 997DXI651

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Our take on the Polk Audio DXi651 (Factory Refurbished)

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 DXi651

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.

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.

Great Speaker. Smooth and detailed.

ricky, Greensboro, NC

What's in the Box:

  • 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

Product 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

Polk Audio DXi651 (Factory Refurbished) Reviews

Average Customer Review(s):

(5 Reviews)

Polk Audio DXi651 (Factory Refurbished)

ricky from Greensboro, NC on 3/5/2017

2016 Ford Mustang
Crutchfield Customer Review (What's this?)

Great Speaker. Smooth and detailed.



Polk Audio DXi651 (Factory Refurbished)

Anonymous from Villa Rica, Ga on 1/22/2017

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

Amazing sound and quality. Easy to install and couldn't be more happier with my purchase



Polk Audio DXi651 (Factory Refurbished)

Michael from Delaware on 10/31/2016

2006 Chevrolet Colorado
Crutchfield Customer Review (What's this?)

100% improvement over factory speakers

Pros: You can aim the tweeters

Cons: None

Polk Audio DXi651 (Factory Refurbished)

Ronald from Westminster, SC on 9/19/2016

2007 Saturn Outlook
Crutchfield Customer Review (What's this?)

Excellent sound and great price. With Crutchfield's install kit, it was an easy job. Thanks Crutchfield.

Pros: Excellent sound for the price. I am happy with them.

Cons: None.

downgrade from stock speakers

jason from New Jersey on 7/23/2016

2016 Chevrolet Cruze
Crutchfield Customer Review (What's this?)

I always loved Polk Audio! I saw these factory refurbished figuring I would be getting a great deal on decent speakers. All I wanted was to be able to turn my stereo up a little louder before the speakers would distort and a little better bass response. With the power rating of these and my past experience with Polk Audio, I assumed I would get what I want for a good deal. I installed two of these on the right side of my 2016 Cruze and left the stock on the left to compare. The stock bass was way deeper. The Polk Audio may have had in general a cleaner sound but lacked majorly in low end bass and started to distort around the same volume. I am very disappointed in these. I wouldn't recommend these unless you have old dry rotted speakers that you are replacing, I would think most stock speakers these days are equal or better than these.

Pros: look nice

Cons: no low end bass as described. States low 35hz-22k hz. There is no way these go down to 35hz! Distorts way to soon on a stock stereo with no amp.

Crutchfield response on July 25, 2016 Whenever you are not completely satisfied with anything you purchase from Crutchfield, please contact our Customer Support team. Purchases from Crutchfield can be returned or exchanged within 60 days of the purchase.

Hands-on research

Features and Specs

Speaker Size 6 3/4
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 35 - 22k Hz
Minimum RMS Wattage 6
Maximum RMS Wattage 60
Peak Power Handling (Watts) 180
Impedance (Ohms) 4
Top-mount Depth (Inches) 2
Bottom-mount Depth (Inches) N/A
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. Once the speakers are mounted, the tweeters can be tilted (approximately 25°) for optimum imaging.

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.

Q & A

Customer Q&A