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Polk db840

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RRP: $155.00
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8-Inch Single Voice Coil 4 Ohm Subwoofer

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. 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 Optional db8G grille is available. 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. Specifications Driver Complement Subwoofer Quantity: 1 Diameter: 8" (20.32cm) Type: Dynamic Balance woofer polymer composite cone Electrical Total Frequency Response: 30-200 Hz Nominal Impedance: 4 ohms Efficiency: 85 dB Power Handling Continuous: 180 watts Peak: 360 watts Voice Coil Driver Diameter: 1 1/2" (3.81cm) Shipping Unit of Measure: each Installation Cut-Out Diameter: 7 1/8" (18.10cm) Driver Mounting Depth Top Mount: 4 1/16" (10.32cm) Bottom Mount: 4 1/2" (11.43cm) Thiele / Small Parameters Resonant Frequency: 49 Hz Xmax Xmax Linear: .51 inch/13 mm (peak to peak) MMS: 67g BL: 10.3 Tesla Meters CMS : 157.6 Micro Meters Recommended Enclosure: Sealed/Ported/Bandpass SD: 35.65 sq inch/ 230 sq cm VAS : .42 cubic feet/11.9 L QTS : .6 QES : .6 QMS : 14.1 Warranty Speaker Warranty: 1 year (original purchaser)

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