This product is a vintage Polk model and is not available for sale, but it may still be available in some stores as a closeout or used product. The following text is taken from the original sales brochure for this product and does not reflect current availability. If you happen to have any question or concerns about this product, or any other Polk Audio product, feel free to contact our Customer Service Department at 1-800-377-7655 Monday - Friday, 9am - 5:30pm EST


3 1/2

Available Finishes:
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Because Upstream is More Fun Than Mainstream

EX Series II

They're everything you need in a car speaker. Incredible sound at an affordable price. Designed to fit. And built to last.

EX Series II full range and coaxial speakers are an ideal combination of high performance and "drop-in" flexibility. Designed to replace your factory speakers, they are exactingly engineered with high quality materials to provide state-of-the-art performance without the hassle of custom installation. That's 'cause Polk designed the EX Series II with multi-hole mounting patterns and extremely low profiles to ensure an easy fit into virtually any factory speaker location.

The EX351 features:

  • Liquid Crystal Polymer driver cones for better performance and reliability
  • Rubber surrounds for long term high performance
  • Low profile design to ensure a perfect fit in a wide variety of locations

EXII speakers use materials that are usually found only in speakers costing much more. The butyl rubber surrounds help give them smooth midrange and extended bass response, and won't tear or crack like foam rubber surrounds found in other brands. The polymer composite cones in the midranges and woofers are moisture resistant and light -- yet extremely rigid for lightning quick response with extremely low distortion.

Speakers have to fit into your car, huh? Extensive database research helped us develop a multi-hole drop-in system to fit virtually every application. From a Miata to a Firebird to a Jeep Wrangler, there's an EX Series II speaker that drops right into your car. No cutting. No knuckle banging. No hassle. We are ALL ABOUT database research here at Polk Audio.

The Polk EX Series: competition quality and excitement, at prices barely more than the boring stuff.

Driver Complement

Mid / Woofer
Diameter3 1/2" (8.89cm) 
TypePolymer composite cone with rubber surround 


Total Frequency Response130hz-18khz 
Nominal Impedance4 ohms
Efficiency89 dB
Power Handling
Continuous50 watts


Cut-Out Diameter3 1/8" (7.94cm) 
Driver Mounting Depth
Top Mount1 2/5" (3.56cm) 


Total Shipping Weight2.50 pounds


Speaker WarrantyLimited, 1 year Parts and Labor 

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.

EX351a Media

EX351a Literature

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EX351a Accessories