SKU 1103
8-inch 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.

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