Polk Car Audio - db840

8" Single Voice Coil 4 Ohm Subwoofer


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
  • Optional db8G grille is available.

  • Specifications:

    Dimensions:
  • Cut-Out Diamete: 7 1/8" (18.10cm)
  • Driver Mounting Depth - Bottom Mount: 4 1/2" (11.43cm)
  • Driver Mounting Depth - Top Mount: 4 1/16" (10.32cm)
  • Driver Complement:
  • Subwoofer - Diameter: 8" (20.32cm)
  • Subwoofer - Quantity: 1
  • Subwoofer - Type: Dynamic Balance woofer polymer composite cone
  • Electrical
  • Efficiency: 85 dB
  • Nominal Impedance: 4 ohms
  • Total Frequency Response: 30-200 Hz
  • Power Handling - Continuous: 180 watts
  • Power Handling - Peak: 360 watts
  • Voice Coil - Driver Diameter: 1 1/2" (3.81cm)
  • Thiele / Small Parameters:
  • BL: 10.3 Tesla Meters
  • CMS: 157.6 Micro Meters
  • MMS: 67g
  • QES: 0.6
  • QMS: 14.1
  • QTS: 0.6
  • Recommended Enclosure: Sealed/Ported/Bandpass
  • Resonant Frequency: 49 Hz
  • SD: 35.65 sq inch/ 230 sq cm
  • VAS: .42 cubic feet/11.9 L
  • Xmax - Xmax Linear: .51 inch/13 mm (peak to peak)
  • Available in:
    Size: Sold as Singles

    MSRP: $140.00 CAD

    8

    Click to enlarge