About the Polk Audio db840
Polk Audio's db Series subwoofers give you trademark Polk performance without stressing your wallet. These subs combine high-tech materials with a laser-optimized motor structure for smooth, powerful bass response.
The db840 8" subwoofer boasts a rigid polypropylene cone and durable Santoprene™ surround built to handle big power over the long run. Polk Audio tests their subs rigorously to ensure that they stand up to sunlight, moisture, and extreme temperature changes.
Match a db sub to a suitable enclosure, and enjoy impressive low-frequency performance rarely found in this price range.
Priced per speaker
- 8" 4-ohm subwoofer
- polypropylene cone with Santoprene rubber surround
- 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
- Our 60-day money-back guarantee
- MFR # AA8401-A
What's in the box:
- One 8" woofer
- 1 Rubber gasket (installed)
- 8 Mounting screws
- Manual (English/Spanish/French)
- Online registration sheet
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More details on the Polk Audio db840
Features & specs
|Surround Material||Santoprene rubber|
|Ideal Sealed Box Volume (cubic feet)||0.35|
|Ideal Ported Box Volume (cubic feet)||0.6|
|Port diameter (inches)||3|
|Port length (inches)||11|
|Dual Voice Coil||No|
85 dB at 1 watt |
|Frequency Response||30 - 200 Hz|
|Max RMS Power Handling||180|
|Peak Power Handling (Watts)||360|
|Top Mount Depth (inches)||4|
|Bottom Mount Depth (inches)||4 3/8|
|Cutout Diameter or Length (inches)||7 1/16|
|Parts Warranty||1 Year|
|Labor Warranty||1 Year|
Polypropylene Cone: The cone is made with polypropylene, which provides durability while being lightweight and rigid. The cone is supported by a vented cone/coil coupler, which stiffens the cone for greater mechanical stability and lower distortion.
Santoprene Surround: The Santoprene surround is resistant to extremes in temperature, humidity, and exposure to sunlight for excellent long term reliability.
NOMEX Spider: The fire-retardant flat NOMEX Spider allows extended linear motion while providing highly reliable mechanical and thermal stability.
Triple-vented Kapton Voice Coil Former: 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.
Klippel Laser Analyzed: The Polk db woofer's voice coil alignment, motor, and suspension are optimized using a state-of-the-art Klippel laser analyzer for superior cone travel linearity, resulting in a flatter response with lower distortion.
Break-In Period: Polk db subwoofers will achieve even greater performance once they are thoroughly broken-in. To break in a new db Sub, play music through it for 20 to 30 hours at moderate levels.
Recommended Sealed Box Volume: Polk recommends mounting this woofer in a sealed enclosure made out of 3/4" MDF with an internal volume of 0.35 cu/ft.
Recommended Ported Box Volume: Polk recommends a ported enclosure made out of 3/4" MDF with an internal volume of 0.60 cu/ft using a 3" diameter x 11" long port.
Recommended Bandpass Box Volume: Polk recommends a bandpass enclosure made of 3/4" MDF with a total internal volume of 0.90 cu/ft. The bandpass box should have a 0.40 cu/ft sealed rear chamber and a 0.50 cu/ft ported front chamber with a 4" diameter x 12" long port.
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