Expert Service 1-877-289-7664 [Hours]

Oct Call-In Sale

Polk Audio db351

3.5" 2-Way Marine Certified Coaxial Car and Marine Speakers

In Stock
|

List price $79.99

$49.99

with warranty

You Save: $30.00 (37.50%)

Order within 22 hrs 55 mins to ship 10/31

Arrives by Wednesday, Nov. 5 to zip 07095

Add an Extended Warranty

Fast, Free Shipping

Within the US 48

60-Day Money-Back

Hassle Free Returns

Low Price Guarantee

Seen it for less? Click here

365-Day Coverage

Warranty assistance for a year

Will this fit my ride?

Check Vehicle

In Stock

Arrives by Wed, Nov. 5

Get FAST answers from customers ASK a Question See questions answers

Exceptional Quality and Versatility

Step up your vehicles audio performance with Polk Audio's revolutionary db351's. Cutting edge technology has allowed for an efficient speaker that has ability to accurately reproduce music like you have never heard before. A precise balance of materials including the Silk/Polymer Dome tweeter and Mica Cone woofer enable smooth roll-off and quick response at any volume. The rubber surround adds to bass response as well as increases the lifetime of the speaker under any conditions. Being marine certified, the Polk db351's will surprise you with its versatility and ability for use in many applications. The high-efficiency loudspeaker means less power is necessary for the same quality output. The revamped db Series delivers that perfect Polk Audio performance and durability like never before.

Speaker Features:

  • 3-1/2" 2-way Speakers (Marine Certified)
  • Power Handling:
    • Peak: 210 watts per pair / 105 watts each
    • RMS: 70 watts per pair / 35 watts each
  • Impedance: 4 ohms
  • Dynamic Balance polymer/mica composite mineral filled cone is stiff yet lightweight for big sound and little distortion
  • 12mm Liquid-Cooled Silk/Polymer composite Dome Tweeter with Neodymium magnet for clear, detailed highs
  • Low-mass 2-Layer 25mm Kapton voice coil former is lightweight for high sound output
  • Multi-hole mounting pattern and shallow depth for easy drop-in installations in most cars
  • Durable butyl rubber surround won’t fall apart under the stress of extreme temperatures, sunlight or time
  • Pole Plate Heat Sink promotes better heat dissipation for superior power handling and reliability
  • Acoustically inert stamped steel basket
  • Flat Spider for faster, longer excursion linear motion
  • Flexible woven tinsel leads sewn directly into Spider for greater reliability
  • Frequency Response: 90-22,000 Hz
  • Also found as: DB 351
  • 1-year SonicElectronix.com warranty

Priced Per Pair

Speaker Specifications

Series
This is the manufacturer product line of speakers.
db (Polk)
Priced Per
Car Speakers are typically sold in pairs so you will receive 2 speakers for each speaker purchase on speakers marked "Priced Per Pair". If a speaker is marked "Priced Per Each" then the speaker is sold individually and each purchase you make will result in 1 speaker. High-powered tweeters, midrange and full-range pro audio for car speakers are typically sold per each speaker.
Pair
Speaker Size
Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
3-1/2"
Design
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
2-way
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Dome
Tweeter Composition
Materials such as polypropylene, silk, cloth, and paper are the most common, where as many more recent tweeters are now manufactured with composites such as Aluminum, Titanium, Mylar, and other materials.

PEI is an acronym for "Polyetherimide" which is an amorphous, amber transparent, high-performance thermoplastic.

Silk-Polymer Composite
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Polymer/Mica Composite
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Butyl Rubber
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
105 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
35 watts
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
 
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
91 dB
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
90 - 22000 Hz
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
4 ohms
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.

Yes
Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
1-1/2"
Bottom-Mount Depth
The depth when installed from the bottom of the mounting surface. Measured from the bottom of the speaker's magnet to the top of the mounting holes on the rim of the speaker.
1-11/16"
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches or millimeters, required to contain the speaker.
3-1/8" x 3-1/8" 
Speaker Grilles
A grating or screen of metal or plastic bars or wires, mounted in front of a speaker as protection. If yes, the speakers will include matching speaker grilles. If no, there are no grilles included.
No

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
78%
4 Star
17%
3 Star
0%
2 Star
0%
1 Star
6%

Average Attribution Rating

Durability
4.6
Value
4.7
Features
4.6
Design
4.8
Usability
4.8
Paul

Waimea, HI

Overall
Durability
Value
Features
Design
Usability
Great product

March 29, 2010

Installed these in the dash and rear pillars of my fj cruiser. Almost a direct bolt in with some modifications. Speakers came with bass blockers and can really crank out some ear piercing highs. Way better than the stock speakers. Clean clear sound.

2 of 2 found this helpful

Help our customers find the most helpful reviews

mike g

lawton,ok

Overall
Durability
Value
Features
Design
Usability
Polk Audio db351

July 12, 2009

very good sounding speakers,obviously not very good for bass but, very clear overall very satisfied.

2 of 2 found this helpful

Help our customers find the most helpful reviews

Jesusvel

Tx

Overall
Durability
Value
Features
Design
Usability
Great product

June 14, 2009

This purchase was an upgrade for my stock speakers. Great mids and highs.

2 of 2 found this helpful

Help our customers find the most helpful reviews

MarkyMark

North Massapequa, NY

Overall
Durability
Value
Features
Design
Usability
Excellent Quality

April 27, 2009

I purchased this speaker specificly for my 2007 Pontiac Grand Prix. It was a replacement for the original center dash speaker. The db351 sounds much better than the original speaker. I recommend this speaker as a replacement, it was a perfect fit.

2 of 2 found this helpful

Help our customers find the most helpful reviews

Luke

Ny

Overall
Durability
Value
Features
Design
Usability
One of the best value speakers out there!

October 7, 2014

Bought to replace the overly bright memphis speakers in the dash of my 88 mustang. These are perfect as they are also more efficient. So, they play louder under the same volume. The silk dome tweeters sound refined and mid range is accurate. Overall very pleased with them. Just don't have the tilting feature of the larger speakers.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Dwight

Myrtle Beach, SC

Overall
Durability
Value
Features
Design
Usability
Just what I needed

June 9, 2014

Each time I have ordered from them it has always arrived super fast. A great company to deal with.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Austin

Chattanooga, TN

Overall
Durability
Value
Features
Design
Usability
Decent

June 2, 2014

I haven't been super impressed by these yet. You really have to keep the bass out of them since they are so small. the bass blockers that come with them don't seem to work very well. I have them running on an amp with 35 watts to each one. Definitely run a high pass filter with these at 125hz or higher. If you do that, then they sound great.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Jobajoe

Pleasanton, CA

Overall
Durability
Value
Features
Design
Usability
Polk db351

September 19, 2013

I needed to replace the center speaker in a 2000 Deville....This speaker is amazing! The voice and highs that it produces are outstanding. My system has 6 x 9 in the doors amped at 50 watts each and a 12" kicker with 1000 watt amp and this little speaker stands out above all that sound. Would definitely recommend.

0 of 0 found this helpful

Help our customers find the most helpful reviews

RodgeCat

Sacramento, CA

Overall
Durability
Value
Features
Design
Usability
Amazing sound quality

August 27, 2013

I installed these in the front dash using the included filters. The mid and highs are truly amazing. This was the perfect addition to my car audio system. Quick delivery and great price. Thank you!

0 of 0 found this helpful

Help our customers find the most helpful reviews

AngryBiker

Hampstead, MD

Overall
Durability
Value
Features
Design
Usability
high quality speakers

September 4, 2012

i bought these speakers for my daughters car to upgrade from the oem junk that was in there.polk audio knows how to make speakers.these speakers sound great.they are marine certified too. polk speakers are very high quality and i think they are some of the best speakers you can buy.sonic electronix is probably the best online place to buy all your audio needs. there prices can,t be beat either! enough said just buy them.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Ron

Australia

Overall
Durability
Value
Features
Design
Usability
Excellent Quality!

July 12, 2012

The Polk Audio db351 is the perfect replacement car dashboard speaker. Sound quality is excellent. The speakers came supplied with protective bipolar bass blockers, fitted just perfectly and were very easy to self install.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Beaver79

Canada

Overall
Durability
Value
Features
Design
Usability
Graet value

June 16, 2012

This is a great product. I recommend this product for everyone who needs a little speaker with good quality.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Bradley

Ames, IA

Overall
Durability
Value
Features
Design
Usability
A nice replacement speaker

May 20, 2012

I used one of these speakers as a replacement for the center channel driver in a Buick Lacrosse. Its high sensitivity and smooth sound made it a big improvement over the factory driver. And they even include bass blockers if you'd like to use them! I did not as the center channel already appears to have the bass limited from the factory amp. The tweeter sticks up pretty far over the woofer - be aware of that for clearance issues!

0 of 0 found this helpful

Help our customers find the most helpful reviews

Ron

Forrest il

Overall
Durability
Value
Features
Design
Usability
Rocking speakers

May 3, 2012

Bought these and modified some cans for my Harley. Matched them with a Cerwin Vega Stealth 220, also from Sonic Electronix, and at 95mph, you can still hear everything extremely well over the bike and wind, and the 220 is not pulling any amps. Matter of fact, I fused it at 10 amps no problem. Would recommend both of these products, and they are at a great price also.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Leo

Pittston, PA

Overall
Durability
Value
Features
Design
Usability
Excellent Dash Speakers!!

January 3, 2012

These speakers really bring out the highs and complement well with the Polk audio 6x8 speakers. I have these mounted in the Dash of my brothers car and with these there really is no need to amp the rear speakers even with his two CVR's!

0 of 0 found this helpful

Help our customers find the most helpful reviews

Bubba

Gold Hill, NC

Overall
Durability
Value
Features
Design
Usability
Great product,BAD Support

November 28, 2011

Units came w/2 resisters? No rhyme or reason as to what I should do w/ them? Put the units (2 sets) in a 1997 Roadhawk Trike. Awesome w/ the Sony marine I purchased from sonic electronic.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Jeff

Chino Ca

Overall
Durability
Value
Features
Design
Usability
Good Sound

November 19, 2011

Used in a hideaway system, perfect sound and size. Recommend to anyone looking for a small speaker with great sound.

0 of 0 found this helpful

Help our customers find the most helpful reviews

gsiphoto

Philadelphia, PA

Overall
Durability
Value
Features
Design
Usability
Extremely disappointed...

May 4, 2010

I bought these speakers to replace the worst speakers i have ever heard in my Toyota FJ Cruiser. Salesman said they would work well. I have owned Polk before in the home... great stuff, still use them. But these are no better than what Toyota shipped. Really crap. Would not recommend them to anyone.

2 of 4 found this helpful

Help our customers find the most helpful reviews

Accessory Tools and Products

Accessories added

Streetwires 50 ft. of True Spec 16 Gauge Speaker Wire

You need speaker wire to connect your speakers!

Your Price $29.99

Belva 23 ft. of True Spec 16 Gauge Speaker Wire

100% Copper Clad Aluminum, PVC blended jacket for easy installation and high strand count for maximum audio quality

Your Price $12.99

16-14 AWG Butt Connectors

These blue butt connectors are ideal when connecting thicker speaker wire your new aftermarket speakers!

Your Price $4.99

16-14 AWG Blue T-Tap Adapters

Allows for fast and easy splicing of wires by easily tapping into the cable.

Your Price $4.49

16-14 AWG Quick Disconnect Connectors

These blue quick disconnect connectors make it easy to connect and disconnect speaker wire your to your new aftermarket speakers!

Your Price $7.99

NVX SDSK2 Speaker Kit

Eliminates speaker panel distortion and reduces vibration, rattles, and squeaks!

Your Price $14.99

Dynamat Xtreme Speaker Kit 10415

Enough sound dampening for 2 speakers!

Your Price $17.95

Stinger Roadkill Speaker Kit

Use this to eliminate rattle from your speakers!

Your Price $13.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $14.99

Universal Wire Puller & Grabber

Running wires has never been easier! This wire puller allows you to run wires through those hard to reach places!

Your Price $6.99

Xscorpion 9-Piece Nylon Plastic Pry and Chisel Tool Set

Easily removes dash/trims, door clips, panels and pins, rubber grommets and vehicle emblems.

Your Price $14.99

Xscorpion WDCR2 Window and Door Clip Remover

Removes and installs handle and window crank clips.

Your Price $6.99

3 in 1 Wire Quick Splice T-Tap and Butt Connector Crimper + Wire Cutter

Used for cutting copper and aluminum wires up to 8 gauge.

Your Price $21.99

NVX SDRLR1 Sound Dampening Rubber Roller

Install your Sound Dampening with ease! This heavy duty rubber roller is designed specifically to install your NVX products!

Your Price $7.99

Items we think you might want
NSP35 thumbnail
NVX NSP35

• Peak Power: 80W
• RMS Power: 40W
• 20mm Silk Dome Tweeter
• Mounting Depth: 1-1/2"
• Red Metallic Injection Molded Polypropylene Cone
• 4 Ohms Impedance
• Sensitivity: 90dB

Your Price $29.99

TS-A878 thumbnail
Pioneer TS-A878

• Peak Power: 60W
• RMS Power: 30W
• 1" PEI Dome Tweeter
• Mounting Depth: 1-7/16"
• Injection Molded Polypropylene Carbon-Graphite Composite Cone
• 4 Ohms Impedance
• Ultra-Slim Neodymium Magnet

Your Price $39.95

TR350-CXi thumbnail
JL Audio TR350-CXi

• Peak Power: 100W
• RMS Power: 50W
• 1/2" Textile Dome Tweeters
• Mounting Depth: 1-9/16"
• Injection-Molded Mica-Killed Polypropylene Cone
• 4 Ohms Impedance
• Sensitivity: 83dB

Your Price $65.95

Browse 1 question and 1 answer
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
Polk Audio is well liked speaker and these are the right size to fit in my dash.
Philip Z on Aug 24, 2014

Product Summary

Manufacturer

Model Number

db351

UPC

747192112707

Weight

3.00lbs

Internal SKU

db351

Internal Product ID

9123

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Polk Audio db351

  • Polk Audio db Series Coaxial and Component Car Speakers
  • Sonic Electronix: The X Factor when Shopping Electronics