***Factory Sealed***

***New In Box***

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

Product Features and Technical Details

Product Features

Technical Details

• Woofer Diameter: 8 inches (20.32 cm)
• Woofer Cone: Black Dynamic Balance Polymer Composite cone
• Electrical:
• Overall Frequency Response: 30-200 Hz
• Nominal Impedance: 4 ohms
• Power Handling (continuous): 180 Watts
• Power Handling (peak): 360 Watts
• Efficiency: 85 dB
• Voice Coil Driver Diameter: 1-1/2 inches (3.81 cm)
• Driver Mounting Depth (Top Mount): 4 inches (10.16 cm)
• Driver Mounting Depth (Bottom Mount): 4-14/25 inches (11.58 cm)
• Recommended Enclosure: Sealed/Ported/Bandpass
• Resonant Frequency: 49 Hz
• Qms: 14.1
• Qes: .6
• Qts: .6
• Vas: .42 cubic feet/11.9 L
• Cms: 157.6 Micro Meters
• Bl: 10.3 Tesla Meters
• Sd: 35.65 sq inch/ 230 sq cm
• Xmax (linear): .51 inch/13 mm (peak to peak)
• Mms: 67 g

Product Description

Amazon.com Product Description
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

Note:

• The item you are bidding is New in a sealed box.

Payment:

• Paypal (I accept credit card and I only accept verified account and ship to confirmed address)

Shipping:

• Shipping within 3 days upon receipt of payment. Tracking number will be given once the good is shipped. No local pickup please.
• Will only ship to CONFIRMED address if payment is made through Paypal. No exception.
• Shipping & Handling fee covers actual shipping fee, packing material, and shipping label. Continental U.S. only. I Do Not ship to Hawaii, or Alaska, Sorry. No PO Box address please.

Auction rules:

• Winner please contact seller within 24 hours after the auction ends.
• Payment must be received within 3 days after the auction ends.
• All sales are considered final, and no refunds or exchanges will be accepted.
• In case of any problem with the product, contact the warranty provider.
• Place a bid only if you're serious about buying the item. If you are the winning bidder, you will enter into a legally binding contract to purchase the item from us.
• NPB (Non Paying Bidder) will be reported to eBay or square trade and we will leave you a negative feedback, which may ultimately lead to indefinite suspension.
• I reserve the right to cancel bidders with negative or no feedback.
• Please feel free to e-mail me if you have any question.