Dual 4-ohm Voice Coils: This woofer features dual 4-ohm
voice coils that offer flexibility in wiring. When the voice coils are wired
in parallel with each other, the woofer presents a 2-ohm mono load. When the
voice coils are wired in series with each other, the woofer presents an 8-ohm
mono load. In addition, each coil may be connected to a different amplifier
channel and each channel will see a 4-ohm load.
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
NOMEX Spider: The fire-retardant flat NOMEX Spider allows
extended linear motion while providing highly reliable mechanical and thermal
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.
Marine Certification: Polk speakers are marine certified,
making them a good choice for boats in fresh water, convertibles, motorcycles,
ATVs, and other applications where the speaker might get wet. Because they have
coated steel baskets and the terminals are not covered, we do not recommend using
them in salt water environments.
Recommended Sealed Box Volume: Polk recommends mounting this
woofer in a sealed enclosure made out of 3/4" MDF with an internal volume of
Recommended Ported Box Volume: Polk recommends a ported
enclosure made out of 3/4" MDF with an internal volume of 1.50 cu/ft using
a4" diameter x 10" long port.
Recommended Bandpass Box Volume: Polk recommends a bandpass
enclosure made of 3/4" MDF with a total internal volume of 2.15 cu/ft. The
bandpass box should have a 1.0 cu/ft sealed rear chamber and a 1.15 cu/ft ported
front chamber with a 4" diameter x 12" long port.
Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.