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Polk Audio db840 8-Inch Single Voice Coil Subwoofer (Single, Black)

4.4 out of 5 stars 79 customer reviews

Price: $46.18 & FREE Shipping—or get FREE Two-Day Shipping with Amazon Prime

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Standard Packaging
  • 8-inch single-coil subwoofer loudspeaker (single)|Power handling: 180 watts continuous, 360 watts peak|Frequency response: 30-200 Hz|Marine certified for use in boats of all types|
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$46.18 & FREE Shipping—or get FREE Two-Day Shipping with Amazon Prime In Stock. Sold by avSoundz and Fulfilled by Amazon. Gift-wrap available.

Frequently bought together

  • Polk Audio db840 8-Inch Single Voice Coil Subwoofer (Single, Black)
  • +
  • BOSS Audio KIT2 8 Gauge Amplifier Installation Wiring Kit
  • +
  • BOSS Audio CH6530 300 Watt (Per Pair), 6.5 Inch, Full Range, 3 Way Car Speakers (Sold in Pairs)
Total price: $79.85
Buy the selected items together


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This item Polk Audio db840 8-Inch Single Voice Coil Subwoofer (Single, Black)
Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart
Customer Rating 4 out of 5 stars (79) 4 out of 5 stars (340) 4 out of 5 stars (258) 3 out of 5 stars (905) 4 out of 5 stars (68) 4 out of 5 stars (342)
Price $46.18 $24.99 $14.99 $20.03 $69.99 $18.14
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By avSoundz Amazon.com Amazon.com Amazon.com Amazon.com Amazon.com
Color black BLACK Black 8-inch Black Black
Item Dimensions 8 x 8 x 4.56 in 8 x 8 x 4 in 11.81 x 16.78 x 2.46 in 9 x 1 x 4.5 in 9.8 x 9.8 x 7.5 in 3.82 x 8.43 x 8.43 in
Model Year 2014 2014 2013 2014 2012
Style Name 8 INCH 8" 600 Watts 1.5-inch 4-Layer Dual Voice Coil 4-ohm 4-Ohm 8" 400 Watts

Product description

Product Packaging:Standard Packaging

Product Description

Power Handling: Peak: 360 watts RMS: 180 watts Impedance: Single 4 ohms Polypropylene cone woofer Santoprene rubber surround Marine certified: capable of withstanding harsh marine environment Vented coil coupler Fire-retardant NOMEX spider with linear motion Designed and aligned with Klippel laser analyzer Triple vented 4-layer Kapton single 4 ohms voice coil Frequency response: 30-200 Hz Sensitivity: 85 dB top-mount depth: 4" sealed box volume: 0.35 cu. ft. ported box volume: 0.6 cu. ft. 

From the Manufacturer

The Polk Audio db840 8-inch single voice coil subwoofer speaker is an easy way to get great sound without breaking the bank. Great for sealed, ported, or band pass enclosures, the db840 offers high-power handling with low distortion; tight, stomach-shaking bass; and the long-term reliability for which Polk is known.

Incredible sound at an affordable price. Click to enlarge.

Polypropylene cone and Santoprene surround for stability, low distortion, and long-term reliability. Click to enlarge.

Optimized voice coil alignment, motor, and suspension for flatter response and low distortion. Click to enlarge.

Polk Audio's Redesigned and Re-Engineered db Series
Polk Audio's entire db line of coaxial and component speakers has been redesigned and re-engineered with superior looks and even better sound, adding three new sizes to cover a broader range of vehicle applications--at prices that make high performance affordable to everyone. The db Series works well in OEM factory systems as well as with high-powered aftermarket head units and component power amps. Enjoy classic Polk Audio performance and durability like never before.

Engineered for Performance
The db840's polypropylene cone is supported by a vented cone/coil coupler, which stiffens the cone for more stability and lower distortion. The Santoprene surround is impervious to extremes in temperature, humidity, and exposure to sunlight, which means more reliability regardless of the application.

A fire-retardant flat NOMEX Spider allows extended linear motion while providing highly reliable mechanical and thermal stability. And triple venting of the 4-layer Kapton Voice Coil Former, Cone/Coil Coupler, and Pole Piece contribute to the high-power handling and overall reliability of the db Series subs.

Finally, as with all Polk Audio subwoofers, the db840's voice coil alignment, motor, and suspension are optimized using a state-of-the-art Klippel laser analyzer. The result is superior cone travel linearity for flatter response and lower distortion.

Marine Certified
The db840 is Marine Certified, meaning that it's built to withstand the toughest environments--perfect for use in boats of all types. That's why Correct Craft offers Polk Audio speakers in the company's award-winning Nautiques ski and wakeboarding boats.

What's in the Box
Polk Audio db840 8-Inch Single Voice Coil Subwoofer, mounting screws, manual, warranty registration


Product information

Product Packaging:Standard Packaging

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