Plus One Cone: The JBL Power
Series subwoofers feature Plus One woofer cones. Each Power Series subwoofer
features more cone area than comparable subwoofers of the same size. This
increase in cone area means an audible increase in bass output and efficiency.
Woofer Materials: The woofer
has a Kevlar-impregnated paper cone. This combination of materials has a high
strength-to-weight ratio for higher sensitivity, and adds stiffness for a more
accurate bass response.
Die-Cast Frame: The thick wall
construction of the die-cast frame offers maximum rigidity to support the heavy
motor structure of the speaker, and ensure the motor structure stays centered in
the voice coil gap. The frame is fully vented to provide maximum
movement of air behind the cone and spider.
Stitched-in Tinsel Leads: The
tinsel leads are stitched into the spider in two places to greatly enhance
reliability and eliminate audible tinsel lead slap.
Dual 4-ohm Voice Coils: For
increased system flexibility, the woofer has two 3" 4-ohm voice coils. 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 voice coil may be connected to a
different amplifier channel and each channel will see a 4-ohm load.
Recommended Sealed Box Volume: JBL
recommends a 1.0 cu/ft sealed enclosure.
Recommended Ported Box Volume:
JBL recommends a 1.75 cu/ft ported enclosure. One 4" diameter x 10-3/4"
long port, tuned at 33Hz, should be used with the 1.75 cu/ft enclosure.
Recommended Bandpass Box Volume:
JBL recommends a bandpass enclosure with a 1.0 cu/ft sealed rear chamber and a
1.75 cu/ft front ported chamber. Two 4" diameter x 7" long ports,
tuned at 55Hz, should be used with this enclosure.
Power Handling: The woofer has
two 4-ohm voice coils, and each voice coil can handle up to 200 watts RMS (800
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