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 db351 speakers feature 3-1/2" 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 1/2" silk/polymer dome tweeters use powerful Neodymium magnets to deliver precise high-frequency reproduction, enveloping you in bright musical detail. The built-in two-way crossovers keep the high and low frequencies flowing to the proper drivers for seamless, efficient audio.

All db Series speakers feature rustproof baskets and stainless steel mounting hardware. Whether you've got a factory radio or aftermarket stereo, these efficient speakers will spice up your daily drive.

Priced per pair

Product Highlights:

  • 3-1/2" 2-way car speakers (pair)
  • Dynamic Balance polymer/mica composite woofer with butyl rubber surround
  • 1/2" liquid-cooled silk/polymer composite dome tweeter
  • Neodymium tweeter magnet
  • Kapton voice coil
  • built-in 2-way crossover network
  • stainless steel mounting hardware
  • power range: 4-35 watts RMS (105 watts peak power)
  • frequency response: 90-22,000 Hz
  • sensitivity: 91 dB
  • top-mount depth: 1-9/16"
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research

What's in the box?

Download owner's manual

  • Two 2-way speakers
  • 2 Bass blockers
  • 4 Self-tapping screws (length=1")
  • 4 Speed clips
  • Owner's Manual (Eng/Span/Fren/Ger/Ita/Port)
  • Online registration sheet

Features and Specs

Design 2-way
Tweeter Design 1/2" Dome
Tweeter Composition Silk/Polymer composite
Woofer Composition Polymer/Mica composite
Woofer Surround Butyl Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Sensitivity 91 dB at 1 watt
Frequency Response 90 - 22k Hz
RMS Power Range (Watts) 4-35
Peak Power Handling (Watts) 105
Impedance (Ohms) 4
Top-mount Depth (Inches) 1 9/16
Bottom-mount Depth (Inches) 1 5/8
Cutout Diameter or Length (inches) 3 1/16

Product Research


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.

Silk/Polymer Composite Tweeters: The speakers feature 1/2" liquid-cooled silk/polymer composite tweeters for clearer, more accurate highs.

2-way Crossover Network: The built-in 2-way crossover network sends the appropriate frequencies to each driver for cleaner sound and better imaging.

Bass Blockers: The DB351 speakers include two 200 micro-farad capacitors which act as 200 Hz high-pass filters to block bass frequencies from the speakers. These should be installed in-line on the positive (+) speaker lead of each speaker.

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.

Polk Audio db351 Reviews

Average Customer Review:

19 reviews
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Written By Ted H., Santa Barbara, CA on Sunday, December 30, 2012

Crutchfield Customer Review (What's this?)

If only Polk made speakers that sounded like these and fit my front and rear doors! These two little guys really fill out the sound in my ride. I installed them in the dash of my 2002 Dodge Ram. Sometime awhile back, I thought I had finished customizing the system, but it seemed like something was missing from the overall sound. New Alpine HU, front and rear door speakers upgraded to aftermarket speakers and amp (Alpine 6x9's and V-power amp) a 500W Alpine mono block for a 10" sub enclosures located under the rear seats and a DSP unit. It pounded, but it just was missing the highs my speakers were not delivering. Then I realized there were 2 dash locations I wasn't utilizing for tweeters! Now throw these babies in and talk about staging! They really made my system come alive. If you have a location for 3-1/2" speakers and these are not in there, get em' in- you will be very happy you did.

Pros: smooth, glassy highs with no noticeable distortion. fabulous price point!

Cons: yes, the tweeter does protrude higher than most speakers.

Nice sound, do not fit the application though!

Written By Kirk, Wilkes-Barre, Pa on Saturday, October 06, 2012

Crutchfield Customer Review (What's this?)

These speakers do sound fine, but though they are listed as a direct fit for my '78 Monte Carlo, they are not. In order to make these work in a G-Body you'll want to pick up another set of speaker grills as you'll need to cut the center out in order to be able to mount them. As soon as I save up a few more bucks I'll be replacing these with proper fitting speakers as I hate to make this car look "hacked". If I had not torn the box I would have returned these immediately!

Pros: Clear sound, bass blockers included, outstanding highs.

Cons: Poor fit, tweeter is too tall, grill modification required. Listed as a direct fit but are far from it.

Impressive for small units

Written By HemiSam, Houston, TX on Thursday, August 02, 2012

Crutchfield Customer Review (What's this?)

These are pretty darn impressive little units that don't require a lot of power. Huge upgrade over the made in Mexico stock units.

Very impressed with Polk for these.

Polk Audio db351

Written By the Turnpike Terror, the Highway on Tuesday, May 15, 2012

Crutchfield Customer Review (What's this?)

I bought these for use on my classic car equipped with a conversion audio system. (classic looks of an original radio, with the insides of a modern radio) The original 1963 Chrysler Imperial audio system is equipped with a speaker is a single dash mounted 7" speaker with one 6" x 9" in the package tray.(like most old classics) Wanting to retain the stock looks of my vehicle without cutting ,yet have modern sound I replaced the factory single 7" speaker with 2 Polk Audio 3.5" mounted side by side. As with the other reviews, the only issue Involved, was the height of the tweeter. If you look at the side view of the enclosed speaker photos, it will give some idea. Problem solved by making a thicker speaker mounting plate. These speakers sound WONDERFUL! Combined with a pair of Polk Audio DXi690 6x9 in the rear, it gives new life to a classic car. Excellent cure for a classic problem. They can handle the volume being cranked or the low background sounds for a cruise.

Pros: Compact size pack a whallop, Fair price, Wonderful sound

Cons: Only one, that being the height of the tweeter, if you can work around that in your installation, these are for you

Polk Speakers

Written By Larry, Bellevue, MI on Sunday, May 13, 2012

Crutchfield Customer Review (What's this?)

These worked very well for the project I had. I put them into some Miata seats that I have in my MGB and they work perfect. The gentleman that helped me was very good. Thank you for such good products and staff

great sound from such a small size

Written By Brad D, Pageland SC on Monday, March 07, 2011

i bought these speaker to use as my center channel. I picked Polk because i already have a
set of Polk 6 1/2 components up front and some Polk 6-1/2 two ways in the rear doors.
They sound great and really fill in the center stage of my system. They have crystal clear
highs and the supplied 200Hz capacitors really do the job blocking the lows. All of the Polk
speakers I have purchased from Crutchfield have the power handling characteristics i need
plus they sound great in my Mercedes. I also like the fact that I can call you guys at anytime
with any questions I may have and I always receive professional advice as well as great
customer service. You guys Rock!!!

Polk Audio db351

Written By Anonymous, FL. on Wednesday, October 27, 2010

Crutchfield Customer Review (What's this?)

Good speakers that come with 200 umf bass blockers, installed easy.

Mustang Fox body install

Written By BigCheeseStick, Myrtle Beach, SC on Monday, June 21, 2010

Great sounding speakers with distracting clarity. By "distracting clarity" I mean when your playing a song your familiar with and have listened to on other speakers you can't help but concentrate on the music & the crisp clear highs and mid.'s you've been missing before!

My main reason for wanting to write the review is that these speakers WILL absolutely bolt right in place in a Fox body mustang ('86-'93)! I made no modifications what-so-ever to the mounts. I personally chose to solder the wires directly to the speaker, eliminating the plug. But, these speakers literally drop right into place, and bolt right up in factory locations. The factory plastic grill pops right back on over them with no interferance at all. You will be able to see the little silver tweeter through the slots in the grill, which looks kinda nice IMO. But because the angle of the slots in the grill, anyone looking through the windshield won't be able to tell a thing (no worries about what possible theives may see!). You can only see the silver tweeter from inside the car.

Polk Audio db351

Written By Dwayne, Fort Lauderdale, FL on Wednesday, June 24, 2009

Crutchfield Customer Review (What's this?)

I don't know what I expected when I purchased these speakers for my dash. I kind of expected them to wow me, but they didn't. I really didn't notice a vast difference in the sound of my music with these aftermarket speakers versus my factory speakers despite one of my factory dash speakers being blown. I guess they are only ok.

dash for my 89 delta

Written By lino, chicago, IL on Thursday, August 21, 2008

Crutchfield Customer Review (What's this?)

this things sound great with a kenwood hu the only thing that frustrated me was that i had to "Customise the dash by cuting around for the tweeter to stick out but it sounds way better than stock now all i ned to do is replace my 6x9's n im all good from there great speakers

1985 GMC C15 installation

Written By Anonymous, Pryor, OK on Tuesday, August 05, 2008

Crutchfield Customer Review (What's this?)

At first glance, the speakers look amazing. The install was very easy thanks to the wiring harness and brackets that were provided by Crutchfield. The speakers sound great! My only disappointment is that the tweeter does stick out quite a bit and now I can see a slight buldge in my dash pad at the speaker locations.


Written By mike, ny on Saturday, May 17, 2008

Crutchfield Customer Review (What's this?)

was looking forward
to installing these
in my caddy, but
unfortunately they
did not fit. the
size of the speaker
was right but the
magnet at the bottom
was too big and i
couldnt fit the
speaker in place.
even if it did fit
by the looks of it,
looked like the
tweeter stuck out
too much so the
speaker grille would
not fit back on

Replacements? More like upgrades!

Written By Cory, San Luis Obispo, CA on Saturday, April 26, 2008

Crutchfield Customer Review (What's this?)

These little speakers are excellent for their size. Great quality, you don't have to turn the treble all the way up just to make them sound decent, the bass is more than enough for a 3 1/2 and they are really easy to install. I put these in my '88 Cutlass Ciera, yeah I know... It's an oldie, but I just can't seem to get rid of it, it's never given me any problems and it's just so smooth on the road. I'm glad I purchased these speakers from Crutchfield and I recommend them to all.

Great sound, great quality, one minor issue

Written By Glenn, Huntersville, NC on Wednesday, March 26, 2008

Crutchfield Customer Review (What's this?)

I bought these to
add to my '05 Magnum
as dash speakers.
They are excellent
quality & I can't
get over the sound
quality. However
the instructions
included were very
basic & ambiguous.
The speakers come
with a Bass Blocker
but the instructions
do not explain
exactly what it is
for, why you need it
or really how to
hook it up. The
speakers work so I
must have used it
correctly. There
also is a male
connector tab on the
tweeter but nothing
says anything about
what it is for. I
left it unhooked,
not sure what it
affects. I would
definitely buy Polk
speakers again but
as with almost
everything these
days the
instructions are not
good, they are
however in like 6
different languages.

Nice upgrade from stock

Written By Albert, New Jersey on Monday, November 05, 2007

Crutchfield Customer Review (What's this?)

First off, if you looking to install these in a Chrysler 300C, don't bother, they won't fit. The tweeter is too high whereas the speaker grill doesn't fit properly. I had them in for a few days with the driver's side grill bulging, but I just could take the look anymore. I removed them and sent back. A major disappointment as the speakers sounded way better than stock. The only gripe I had about the sound was that they carry too much bass for such a small speaker. If I kept them, I'd invest in some low frequency filters as not to blow @ high volume.

this little spkr kicks

Written By Anonymous, davenport, iowa on Sunday, September 23, 2007

Crutchfield Customer Review (What's this?)

if you have a chance to upgrade to it!! i thought the stock speakers were good...pale in comparison to these..very efficient. in my previous car i upgraded to blaupunkts and these polks run all over them... had problem with install speaker harness was available..the stock harness had orange,yellow and white leads. one call to cruthcfield showed limited knowledge on my car, a 2007 vw rabbit...

fantastic dash speaker

Written By evan, San Antonio on Monday, September 17, 2007

Crutchfield Customer Review (What's this?)

I bought these speakers to replace a set of clarion 3 1/2s that I installed in the dash of my '62 lincoln continental a while ago. The clarions were half the price, but the sound quality isn't even half as good as these polks. The highs are crystal clear and not a bit fatiuging; they even put-out some very nice, light mid-bass for a nice rich sound.
The system also includes 5x7 polk db's in the rear deck and two alpine type E 10's with a 400w mono alpine amp in the trunk. I have the system faded 2 to the rear and these polk's match the bass from the subs very nicely even with the amp at 3/4's gain.
I plan on an alpine 4 channel for the 4 polks in the cabin to bring out the sound even more (these polk full range speakers can handle a decent amount of power, but they will eventually distort off the jvc head unit with enough volume(about 40)). I listen to just about any kind of music and they perform admirably for all.

Hit the sweet spot...

Written By Danno, West Chester, PA on Saturday, July 07, 2007

Crutchfield Customer Review (What's this?)

I had been gradually replacing a factory system in a Sebring one step at a time, where these db351s were the finishing touches. They should have been the first speaker I bought, because they really rounded out the system well. They are even handling lower frequencies extremely well (as expected). Not only are the technicians knowledgeable, but the sales people are also extremely savvy on installation issues. It was a moderately complex installation, including an older Kenwood 4-way amp, with 2 of the channels bridged for an 8" Kicker sub in the trunk along with the Polk db6500s in the doors. The door speakers are split with the dash speakers and crossover--sounds really great now. Thanks to all of the Crutchfield staff for letting me work with them to put this configuration together, they made this a great customer experience!


Written By Ozz, El Paso, Texas on Tuesday, May 22, 2007

Crutchfield Customer Review (What's this?)

I tried the Bostons to try something different. They sounded ok, but not like this! I sent the Bostons back and ordered these Polks instead. I love'em!

Product reviews from the Crutchfield Labs

Video: Polk Audio db Car Speakers
by Ken Nail, J.R. Stoffel

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

What are the Labs?

Get everything you’ll need to enjoy your new Polk Audio db351

Reduce ambient road noise and your vehicle's "rattles," for better sound inside your car.
You may need speaker wire to connect your speakers to your amp or receiver.
Keep your speakers clean and dry. They compress to fit behind your speakers.
These speaker connectors are handy if you're running new speaker wire or if your speakers have oversized terminals.
The right tools will help keep your installation simple and clean.
If your stereo doesn't cut the deep bass from your full-range speakers, a set of bass blockers can help prevent distortion and give you cleaner bass too.
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Dynamat 10415 Xtreme Speaker Kit

Two 10-in. x 10-in. Sheets

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Dynamat 10435 Xtreme Door Kit

Dynamat 10435 Xtreme Door Kit

With four 12" x 36" sheets — covers two doors

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Dynamat SuperLite Tri-Pak

Dynamat SuperLite Tri-Pak

Triple package — 3 sheets, 12 square feet (Model #10612)

Item #: 15410612


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T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW16WB1


T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW12WB1


Stinger PRO Series Speaker Wire

Stinger PRO Series Speaker Wire

Priced per foot (16 Gauge)

Item #: 541SPW516B


XTC 3-1/2

XTC 3-1/2" Speaker Baffles

Protect your speakers (3-1/4" depth)

Item #: 237XT30


Metra Female Quick Slides

Metra Female Quick Slides

An assortment of female quick slide connectors for connecting to speaker terminals

Item #: 120FQS10PK


Metra Crimp Tool and Connectors

Metra Crimp Tool and Connectors

Package contains crimp tool and over 150 pieces

Item #: 120CRIMPKT


Add to Cart
S&G Wire Cutter/Stripper Tool

S&G Wire Cutter/Stripper Tool

Cuts and strips 12- to 22-gauge wire

Item #: 18119100


Add to Cart
S&G Tool Aid 87615

S&G Tool Aid 87615

Window and Door Clip Removal Tool

Item #: 18187615


S&G Tool Aid 87650

S&G Tool Aid 87650

Door Trim and Panel Removal Tool

Item #: 18187650


Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6NGL


Add to Cart
Skewdriver Pro SPK4042

Skewdriver Pro SPK4042

Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)

Item #: 180SPK4042


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Spec Tools SQR-200a Squeeze Wrench

Spec Tools SQR-200a Squeeze Wrench

Narrow space ratchet kit with 18 sockets

Item #: 180SQR200A


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Install Bay 3320

Install Bay 3320

Auto-ranging digital multimeter

Item #: 1203320

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Install Bay IB35400

Install Bay IB35400

Premium door panel and trim tool

Item #: 12035400

Add to Cart
Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6LNGL


Add to Cart
Bass Blockers

Bass Blockers

Pairs (800 Hz cut-off)

Item #: 127BB800A2


Add to Cart