Polk Audio db351


3 1/2-inch Coaxial loudspeaker

Incredible Sound, Affordable Price

Welcome to superior looks and even better sound. And we’ve done all that at prices that make high performance mobile audio affordable to everyone! The db Series works really well in OEM factory systems, as well as with high-powered aftermarket head units and component power amps. The db Series delivers classic Polk performance and durability like never before.

db351 Features:

A 3 1/2-inch coaxial that’s small enough for unobtrusive installations, yet created with the technologies that translate into pure Polk performance.

Dynamic Balance® polymer/mica composite mineral filled cone is stiff yet lightweight for big sound, little distortion.

Marine Certified Polk db Series speakers are built tough to withstand the toughest environments so they are perfect for use in boats of all types.

12mm liquid-cooled silk/polymer composite dome tweeter with neodymium magnet for clear, detailed highs.

Low-mass Kapton voice coil former is lightweight for high sound output. Kapton’s high melting temperature (725°F/400°C!) ensures high power handling and kick-butt reliability.

Durable butyl rubber surround won’t fall apart under the stress of extreme temperatures, sunlight or time, for years of the great Polk sound.

Pole plate heat sink promotes better heat dissipation for superior power handling and reliability.

Flat spider for faster, longer excursion linear motion.

Flexible woven Leads sewn directly into spider for greater reliability.

Rock solid, acoustically inert stamped steel basket finished in rustproof gun metal gray.

Stainless steel mounting hardware.

One year parts & labor warranty.

All Polk products are made using the best materials and the most advanced manufacturing techniques. They pass the industry’s most exhaustive quality tests, including drop testing, extreme signal response and UV & salt exposure testing. Polk loudspeakers are built to perform for a lifetime.


Driver Complement

Quantity 1
Diameter 1/2″ (1.27cm)
Type Silk/polymer composite dome
Quantity 1
Diameter 3 1/2″ (8.89cm)
Type Dynamic Balance driver with polymer/mica composite cone with rubber surround


Total Frequency Response 90Hz-22kHz
Nominal Impedance 4 ohms
Efficiency 91 dB
Power Handling
Continuous 35 watts
Peak 105 watts


Cut-Out Diameter 3 1/16″ (7.78cm)
Full-Range Mounting Depth
Top Mount 1 1/2″ (3.81cm)
Bottom Mount 1 11/16″ (4.29cm)


Unit of Measure pair


Speaker Warranty 1 year parts and labor (original purchaser)

Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.


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