Dual Voice Coils: For increased
system flexibility, the woofer has two 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 coil may be connected to a different
amplifier channel and each channel will see a 4-ohm load.
Advanced Fiber Cone: The molded fiber cone
is laminated with a woven fiber cloth. PBO fiber provides higher sound velocity
and better internal loss characteristics than found with other materials; this
results in higher sound pressure levels without cone noise. This cone material
is highly resistant to the elements, so, over time, the specifications of the
cone will not change due to the environment.
Woofer Design: The cone is formed with three
raised ridges around the circumference of the cone. The width of each ridge is
graduated, making a tornado-like appearance. The ridges make the Tornado Cone
much more rigid than conventional cones, with resonant frequencies that are more
than an octave higher. Additionally, the Tornado Cone's resonance is of a more
random nature than those of conventional cones, which reduces their intensity.
Since the resonant frequencies are lower in amplitude and far above the woofer's
useable frequency range, they are much less audible, resulting in clearer, more
detailed bass sound.
Piece Rubber Surround and Gasket: A one
piece rubber surround and gasket attenuates basket vibrations, improving bass
Steel Basket: The design and metal
thickness of the basket provides vibration attenuation equal to that of cast
Vented Pole Piece: This woofer is made
with a one-piece back plate and pole piece. The yoke is bumped for long
excursion. The vent opening is flared and shaped into a spiral to reduce wind
Speaker Terminals: The speaker terminals
are gold-plated for corrosion resistance. The terminals are screw terminals with
standard type male quick-slide terminals sticking out from the bottom terminal
plate. This configuration allows you to attach bare wire, wire terminated with
spade connectors or wire terminated with female quick-slides. The width of the
screw terminals is 0.543". The dimensions of the quick slide terminals are:
0.187" W x 0.03" thick.
Recommended Sealed Box
Volume: The sealed box sizes recommended by Kenwood range from 0.6
cu/ft to 1.25 cu/ft. Within this range, the ideal size recommended by Kenwood is
Recommended Ported Box
Volume: The ported box sizes recommended by Kenwood range from 0.75
cu/ft to 1.5 cu/ft. Within this range, the ideal size recommended by Kenwood is
1.0 cu/ft. One 3" diameter x 7" long port should be used with a 1.0
Handling: The woofer has two 4-ohm voice coils, and each coil
can handle up to 250 watts of continuous input power (500 watts peak). Although
the specifications section of the manual lists two power handling
specifications, "RMS Power Handling" and "Peak Power
Handling", Kenwood has established "Rated", "Maximum"
and "Peak" input power ratings for this woofer. The "Rated"
input power spec is equivalent to the "RMS Power Handling" spec listed
in the manual, the "Maximum" input power rating is a continuous power
handling specification, and the "Peak" input power rating is equal to
the "Peak Power Handling" spec listed in the manual. The power ratings
are as follows:
- "Rated" input power:
250 watts (125 watts per coil)
- "Maximum" continuous
input power: 500 watts (250 watts per coil)
- "Peak" input power:
1000 watts (500 watts per coil)