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Polk Audio db5251

5-1/4" component speaker system

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    Crossover network

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    Tweeter

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Item# 107DB5251 offer details

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Polk Audio

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.

Our take on the Polk Audio db5251

by Leigh Schoettinger

Good music becomes great when you hear it through Polk's db Series car speakers. Polk engineers use laser imaging to determine the ideal combination of speaker materials and design to eliminate distortion. The resulting technology produces speakers with smooth frequency response, sharp detail, and the ability to play music at high volumes without strain.

Polk's versatile db5251 component speaker system features 5-1/4" woofers made from a polymer/mica composite and durable rubber surrounds that won't fall apart under stress from heat, moisture, or time. Liquid-cooled 1" silk/polymer dome tweeters use powerful Neodymium magnets to deliver precise high-frequency reproduction, enveloping you in bright musical detail. You can surface- or flush-mount the tweeters with the included swivel-mount cups. Just aim the tweeters so they broadcast toward your ears, creating a powerful stereo image.

External crossovers direct the right frequencies to the tweeters and woofers to maximize their performance, and their housings let you hide all wiring for a clean, professional look. These speakers feature stainless steel mounting hardware, plus muscular ABS grilles that will add a stylish touch to your car's interior.

See more info on this item

Highlights:

  • component speaker system includes two 5-1/4" woofers, 2 tweeters, and 2 crossovers
  • Dynamic Balance polymer/mica composite woofers with butyl rubber surrounds
  • Kapton voice coils
  • 1" liquid-cooled silk/polymer composite dome tweeters
  • flush- and surface-mount swivel cups
  • Neodymium tweeter magnets
  • electronic tweeter protection circuits
  • 2-way external crossover network (12 dB/octave, 4,000 Hz high- and low-pass)
  • ABS wheel-design grilles
  • stainless steel mounting hardware
  • power range: 10-100 watts RMS (250 watts peak power)
  • frequency response: 53-23,000 Hz
  • sensitivity: 93 dB
  • top-mount depth: 2-5/16"
  • warranty: 1 year
  • Our 60-day money-back guarantee

Priced per system

 

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

Features and specs chart | What’s in the box? | In-depth notes

Features and Specs

Features and Specs
General
Speaker Size
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 5 1/4
Design
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 2-way
Tweeter Design
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 1" Dome
Tweeter Composition
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 Silk polymer composite
Woofer Composition
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 Polymer mica composite
Woofer Surround
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 Butyl rubber
Parts Warranty
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 1 Year
Labor Warranty
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 1 Year
Specifications
Sensitivity
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 93 dB
Frequency Response
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 53 - 23k Hz
RMS Power Range (Watts)
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 10-100
Peak Power Handling (Watts)
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 250
Impedance (Ohms)
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 4
Top-mount Depth (Inches)
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 2 5/16
Bottom-mount Depth (Inches)
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 N/A
Cutout Diameter or Length (inches)
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 4 3/4

Product Research

Product Research
What's in the box?

Download owner's manual

  • 2 Woofers
  • 2 Grilles
  • 2 Tweeters (each tweeter has attached 38" speaker leads)
  • 2 Flush-mount cups
  • 2 Metal flush-mount clamps
  • 2 Surface-mount cups
  • 2 Crossovers
  • Four 39" lengths of speaker wire (each length of wire has female quick-slides on one end and tinned wire on the other end)
  • 16 Self-tapping screws
  • 10 Speed clips
  • Owner's Manual (Eng/Span/Fren/Ger/Ita/Port)
  • Online registration sheet

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.

Woofers
Tweeters
Crossovers

Woofers

Dynamic Balance: 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.

Woofer Cones: Each speaker features a Dynamic Balance polymer/mica composite mineral-filled cone. The cones are stiff and lightweight for big sound and low distortion.

Butyl Rubber Surrounds: For a smoother response and improved durability, the woofers use butyl rubber surrounds.

Kapton Voice Coil Formers: The low-mass 2-Layer 1" Kapton Voice Coil formers are lightweight for high sound output. Kapton's high melting temperature ensures high power handling and excellent reliability.

Pole Plate Heat Sinks: The pole plate heat sinks promote better heat dissipation for superior power handling and reliability.

Tweeters

Silk/Polymer Composite Tweeters: The 1" liquid-cooled, silk/polymer composite tweeters provide clear, detailed highs.

Mounting: The supplied mounting cups allow you to surface- or flush-mount the tweeters. The tweeters swivel in the flush-mount housings, allowing you to adjust them for optimum imaging.

Tweeter Mounting Dimensions:

  Surface Mount Flush Mount
Mounting Height 1.046" 0.364"
Depth 0.825" (screw depth) 0.938"
Frame Diameter 2.002" 2.297"
Cutout Diameter   N/A 1.951"

Crossovers

2-Way Crossovers: Each Butterworth outboard crossover features a 12dB/octave, 4000Hz high-pass network for the tweeter and a 12dB/octave, 4000Hz low-pass network for the woofer.

Tweeter Attenuation Switch: You can adjust the output of the tweeter to match a level appropriate to your vehicle or your system. On the end of crossover (opposite the terminals), the tweeter attenuation switch can be set to 0dB, -3dB, or +3dB.

Electronic Tweeter Protection Circuits: Each crossover has a built-in protection circuit that guards the tweeter against accidental damage from high power.

Crossover Connections: The crossover inputs and outputs are screw terminals. The crossover housing is vented, giving you a choice of hidden wire channels for easier, more professional-looking installs.

Mounting: There are two mounting holes in the base of each crossover.

Crossover Dimensions: L=5.029", W=3.072", H=1.075"

 

Product reviews from the Crutchfield Labs

Product reviews from the Crutchfield Labs (what are the Labs?)
Video: Polk Audio db Car Speakers

Video: Polk Audio db Car Speakers

Ken Nail, J.R. Stoffel
1/21/2009
 

Learn about the features that make Polk Audio db series car speakers a popular choice for improved sound.

 

Product Reviews

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Reviews for the Polk Audio db5251

Average Customer Review:

44 people say:

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5 out of 5

Sound great in my BMW

Written By Byron S, Issaquah WA on Thursday, May 30, 2013
Installed in a 1988 BMW M5
Crutchfield Customer Review (What's this?)
 
88 BMW 5series Was able to mount in the rear speaker enclosures without any external modifications (a little tricky mounting the tweeters but not hard) everything looks stock but sounds great.
Pros:
I think they are a good value for the money. I got more sound than I paid for.
1 out of 1 people found this helpful
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5 out of 5

Love theses Speakers

Written By Bikerdude103, Winder,Ga on Wednesday, March 27, 2013
 
I already have Polk Audio surround sound speakers so when it came time to buy speakers for my truck they were the Only choice and I was right there car/ truck speakers have the same Quality sound as there home speakers do Get these speakers You won't regret it They Really Rock
Pros:
Clear and Crisp
Cons:
The cross over is really big and I had a small space to work with inside my door
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3 out of 5

Polk db5251 component

Written By Tyler M, Ft. Lauderdale on Wednesday, January 09, 2013
 
I gave these speakers 3 stars because I was slightly disappointed after listening to them for the first time. I thought the sound was going to be a little richer. They do sound better than the factory. The mids are ok and the highs are much better than stock. There is virtually no bass. You definitely need a sub with these. For the price they are a decent choice. I am looking forward to getting my sub, I think it will sound really good when the sub is installed. Also, these are being powered by a JL xd400/4 parallel wired with my rear coaxial speakers at 2ohms. They are installed in a 2010 Mazda 6 non-Bose system with the factory head unit .
Pros:
Good highs and mids
Cons:
No bass
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5 out of 5

Clean bright sound

Written By Andy, Chester, Va on Thursday, December 13, 2012
Installed in a 2005 Honda Civic
Crutchfield Customer Review (What's this?)
 
Dolly recommended these to me when we were going over my car audio stuff. I went with two sets of these for my 2005 Honda Civic. The sound from them is very clear and crisp. I was looking for a set of components with great highs and mid and these are it, they sound amazing. I have them running off of a Alpine F450 4x70 RMS and they jam =) I also had them installed by the experts ( yes shameless plug for you guys! ) at the Charlottesville Crutchfield. Everyone at their location was very helpful and very knowledgeable. These speakers sounded so clean and bright we also purchased a whole new Polk surround set up for our home as well from Crutchfield.

TLDR Bright, crisp, clean buy them!
Pros:
Crisp, clean, bright
Cons:
none
1 out of 1 people found this helpful
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5 out of 5

Excellent

Written By Alex S., Dodgeville, WI on Thursday, December 13, 2012
Installed in a 2000 Pontiac Grand Prix
Crutchfield Customer Review (What's this?)
 
Love these, they provide detailed sound and good, tight bass, and mid range power, especially as it nears the lowest 50 hz frequency. No rattling like the previous Pioneer speakers that were installed.
Pros:
Bass, crisp, clear, easy to install, clear instructions.
Cons:
Doesn't play below 50 hz.
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5 out of 5

Polk Audio db5251

Written By Scott M, Ewa Beach, HI on Wednesday, November 07, 2012
Installed in a 2011 Ford Flex
Crutchfield Customer Review (What's this?)
 
Love these crisp clear sound, good power handling. I would recommend these. Running off a Polk Audio 5 channel.
Pros:
Crisp clean sound, good power handling.
Cons:
Must be used w/ a good sub.
1 out of 1 people found this helpful
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5 out of 5

Awesome for 2006 jeep TJ

Written By Ray, MI on Thursday, September 13, 2012
Installed in a 2006 Jeep Wrangler Unlimited
Crutchfield Customer Review (What's this?)
 
I installed these in the dash of the 2006 TJ with some brackets from another retailer for the 5 1/4". I then made some custom tweeter mounts along the A-piller of the windshield. I also replaced the rears with some 6 1/2 651s Polks. Combined with the Alpine mini amp and the Jeep now sounds great. Still using the factory deck and the factory sub seems to be still working as well so those will stay for now. The separate tweeter makes the difference in the Jeep! Sound is much clearer with the top off. I had installed the 6 1/2s first and tested them with the factory fronts and was worried that I wasted my money as they didn't sound that good. I put the components in the front and the rears now sound better as an overall package. The front speakers in the Jeep make more of a difference then the rears seem to.
Pros:
Sound is better then expected.
Cons:
Really none other then the extra fabrication needed to install the tweeters.
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4 out of 5

Clear

Written By Rod, Lowell, IN on Sunday, August 19, 2012
Installed in a 2012 Ford F-150 FX4
Crutchfield Customer Review (What's this?)
 
I just installed these in the front door of my 2012 f150, I have the basic head unit with sync and the speakers are great. They are really super clear. I can't wait to get them hooked up to a amp hopefully I will get some more kids when I do. I only wish the tweets would have fit in the factory mounts in the a post. I had to use a Drexel to open the location up and used the the tweet cups that came with the speakers.
Pros:
Super clear
Cons:
Tweet install
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5 out of 5

Polk audio

Written By Legend, South Florida on Saturday, July 07, 2012
Installed in a 2012 Mazda 3
Crutchfield Customer Review (What's this?)
 
The speakers are great. No problem installing them.And the sound is pretty dollar for dollar......
Pros:
Good Sound and Quality
Cons:
None yet
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4 out of 5

Of course you need an amp with most current head units

Written By RC, Rochester, NY on Monday, June 18, 2012
 
Most newer vechicles have factory stock head units that output very low watts. Saves the car mfg's a lot of $. They make up for this by using speakers with extremely small magnets. In some cases, you can't even see the magnets, they are behind a small "cup" on the end of the speaker. Issue is that you are limited to the range you have with these factory speakers, and if you do change out the head unit, to one with more power, and push the speakers, you will blow them. So, we all buy these nice speakers with big magnets. They are supposed to produce the sound we like. Nice highs, full midrange, and deep lows. But it takes power to drive them. Like the new Chevy Silverados, etc. Install a decent set of speakers. Polk, Alpine, etc. and see what you get. If you use a component system, you will only hear the tweeters and you will be sadly disappointed. So, you need to either change out the head unit to one with at least 25 watts or better yet to add on a sub. This does not mean that you have to listen to the radio loud. It means that it has the power (watage) to move the speaker against the pull of the magnet. Once you provide the power, that is where you will hear your sound come alive. So for those that rate "disappointed" but using the stock head units, this is why. You can buy very inexpensive speakers that will work better than stock for use with your stock head unit. But upgrade both and then you have something worth listening to.
13 out of 15 people found this helpful
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5 out of 5

big improvement

Written By alexH, findlay, OH on Tuesday, June 05, 2012
Installed in a 2003 Ford Explorer Sport Trac
Crutchfield Customer Review (What's this?)
 
installed in my 03' sport trac and they sound great
Pros:
better bass than stock, with the tweeters up higher im able to hear my music better when my windows are down on the highway
Cons:
... haven't found any yet
1 out of 1 people found this helpful
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5 out of 5

Crisp Clear Highs

Written By Stuart, Tampa, FL on Monday, May 14, 2012
Installed in a 2008 Mazda 3
Crutchfield Customer Review (What's this?)
 
These tweeters are awesome, especially compared to the factory speakers which didn't have a seperate crossover. The front component speakers were the last pieces I needed to complete my setup. Since I didn't have hardly any highs on my factory tweeters, when I installed the fronts I put the selector switch on the crossover to +3db, which I later found was a mistake.(to high) I didn't want to take the door panel off so instead I adjusted the Crossover in my JVC amp.(great feature) I was still getting to much SUB from the back, which I suspect is just because the Mazda3 hatchback is small. I really didn't need that much so I adjusted the Sub's gain to 1/2. That did the trick and now the sound is perfectly balanced. The tweeters after adjustment are crisp & clear without being harsh & the sub has been tweeked down so as to not overpower the mids & highs. In other words, expect to spend a litte time to tweek the sound to your liking.
Pros:
Crystal clear highs even under load.
Cons:
No cons I can think of, love the speakers
1 out of 1 people found this helpful
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5 out of 5

First component set of speakers...not disappointed at all!

Written By Blaine, Louisiana on Monday, September 05, 2011
Crutchfield Customer Review (What's this?)
 
This is my first set of component speakers in a vehicle. They are powered by a Boston Acoustics GTA-504 amplifier and I couldn't be happier. They are only getting about 50% of rated RMS power, so they wont make your ears bleed. However, they get plenty loud for a nice SQ system. Mids are tight and highs are crisp on the -3 tweeter setting. Makes my system sound like a concert in my 99 Mustang GT.
2 out of 2 people found this helpful
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5 out of 5

Excellent Sound Quality

Written By Pete B, New England on Tuesday, July 12, 2011
Installed in a 2001 Honda Civic LX
Crutchfield Customer Review (What's this?)
 
I bought these speakers as well as a set of Polk 6X9s for my Honda. Installation was fairly straightforward. The speakers are being driven by a 300W Rockford Fosgate amplifier and are mounted in my doors (Stock location, tweeters a bit above diagonally from the speakers). The sound quality is excellent and you can really hear the difference going from a 2 way to this component setup. As previous reviewers said you may need a sub with these if they are your primary speakers. In my car the 6X9s provide a bit of bass but I am looking to eventually add a small sub.
3 out of 3 people found this helpful
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4 out of 5

Not Bad

Written By Wayne, Georgetown KY on Tuesday, June 21, 2011
 
I got these for the roll bar on my 2003 jeep and they are a big improvment over stock if you have a amp. But do not expect any lows I mean after all their 5 1/4. Highs are great and mids are good would recomend.
1 out of 2 people found this helpful
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2 out of 5

Disappointed with sound

Written By Bill H, Apex, NC on Monday, March 21, 2011
Installed in a 2008 Nissan Altima
Crutchfield Customer Review (What's this?)
 
I just paid this much for a set of these speakers and am so far really disappointed. I was replacing STOCK stereo speakers with these and yes I went with the 5 1/4 vs the 6 1/2 I had in the car. I am still on the factory head unit. These speakers require much more power than I can produce with the current head unit. Replacing with a kenwood double din and am going to add a amp. I expected much more out of these speakers and in hind sight I should have got the 3 way 6 1/2 inch speakers.

I hope these sound better with a nice big amp on them.
3 out of 42 people found this helpful
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4 out of 5

Good, but you'll need a sub

Written By Anonymous, Columbus, OH on Monday, February 21, 2011
Installed in a 2001 Jeep Cherokee
Crutchfield Customer Review (What's this?)
 
These speakers sound fine....but get a subwoofer. I just ordered an 8" Bazooka
tube because I can't hear any low end from these Polks with the engine running.
I realize they're only 5.25", but even my factory (Jeep) 5.25" speakers had SOME
low end.

Crutchfield experience was great as always.
3 out of 3 people found this helpful
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5 out of 5

Polk Audio db5251

Written By Franklin, tyrone, pa on Sunday, January 16, 2011
Installed in a 2006 Honda Ridgeline
Crutchfield Customer Review (What's this?)
 
speaker's sound great in my ridgeline. it was my first time buying after market speaker's
and will all ways return to polk audio if i need to buy for any other car or truck
1 out of 1 people found this helpful
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5 out of 5

Huge improvement over stock

Written By TMS, Belleville, IL on Friday, October 01, 2010
Installed in a 2008 Mazda Mazdaspeed3
Crutchfield Customer Review (What's this?)
 
These are a huge improvement over the stock Bose components in my Mazdaspeed3.
They are being fed 60RMS from an external 4 channel amp (not the stock Bose
amp). Nice clear, crisp music; this was a good purchase decision.
3 out of 3 people found this helpful
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5 out of 5

Fortunately My Initial Thoughts Proved To Be Wrong!

Written By Aaron, Tucson, AZ on Monday, August 16, 2010
Installed in a 2003 Toyota Corolla
Crutchfield Customer Review (What's this?)
 
I installed these in my 2008 Nissa Xterra with a Pioneer DEH-P6000UB head unit and powered by a 2x100W and amp they sound amazing!

The installation was a bit rough but that was because of the size of the speaker wire I was using and the tight fit/angle of the rubber boot between the door and body. I also had to fabricate a bracket from ABS plastic to mount the tweeters. I was still able to use the stock tweeter grills on the dash after some trimming so nothing looks any different.

Once everything was in installed I cranked the volume and was initially disappointed. There was no bass to speak of and the treble was harsh and piercing - almost unlistenable! I thought I'd give them a few days to break in. After a week I didn't notice much change and thought I'd be returning them but first I decided to try and change around the EQ and sound settings on the stereo. That did it, as I was adjusting the settings my stock speakers had I could hear the bass coming in and I was able to remove the tinny sound of the treble. After a few more days the sound got even better!

It's been a few months now and I'm still impressed at how good the speakers continue to sound! They just seem to keep getting better. I've since bought a second pair for my wife's car.
4 out of 4 people found this helpful
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Rated 5-stars by consumers

For a more in-depth review and enhanced detailed information on the Polk Audio db5251, please visit the Crutchfield website product page (/S-V4uvP4DbDw8/p_107DB5251/Polk-Audio-db5251.html ).

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  • Front

    Polk Audio db5251

  • Back

    Polk Audio db5251

  • Crossover network

    Polk Audio db5251

  • Tweeter

    Polk Audio db5251