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Features
Enclosure Compatibility
Features
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 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.
Enclosure Compatibility
Recommended Sealed Box Volume: Polk recommends mounting this
woofer in a sealed enclosure made out of 3/4" MDF with an internal volume of
0.66 cu/ft.
Recommended Ported Box Volume: Polk recommends a ported
enclosure made out of 3/4" MDF with an internal volume of 1.25 cu/ft using a
4" diameter x 12" long port.
Recommended Bandpass Box Volume: Polk recommends a bandpass
enclosure made of 3/4" MDF with a total internal volume of 1.65 cu/ft. The bandpass box
should have a 0.80 cu/ft sealed rear chamber and a 0.85 cu/ft ported front
chamber with 4" diameter x 9" long port.
