Highlights:

• 8" 4-ohm subwoofer
• polypropylene cone with Santoprene rubber surround
• suitable for marine use
• power range: 50-180 watts RMS
• peak power handling: 360 watts
• frequency response: 30-200Hz
• sensitivity: 85 dB
• top-mount depth: 4"
• sealed box volume: 0.35 cu. ft.
• ported box volume: 0.6 cu. ft.
• warranty: 1 year

Incredible Sound, Affordable Price

It’s all here. All the Polk goodness and technology that makes our subwoofers a kickin’ addition to any vehicle’s audio system, as only Polk can deliver.

db840 Features:

“Dished” polypropylene cone supported by a vented cone/coil coupler stiffens the cone for greater mechanical stability and lower 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. That’s why Correct Craft offers Polk speakers in their award-winning Nautiques ski and wakeboarding boats.

Santoprene surround is impervious to extremes in temperature, humidity and exposure to sunlight for excellent long term reliability.

Fire-retardant flat NOMEX^® spider allows extended linear motion while providing highly reliable mechanical and thermal stability.

Triple venting of the 4-layer Kapton voice coil former, cone/coil coupler and pole piece contribute to the high power handling and reliability of the db Series subs.

As with all Polk subwoofers, the voice coil alignment, motor and suspension were optimized using a state-of-the-art Klippel laser analyzer. The result is superior cone travel linearity for flatter response and lower distortion.

Dual voice coil version also available - db840DVC

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.