Cone Design: The woofer uses an injection-molded polypropylene
cone with a raised HELIX logo on the dust cap. This process of cone molding assures
a uniform cone thickness for superior linearity and clarity. It is also light weight
and rigid for decreased distortion and improved bass response. The rubber surround
is resistant to UV rays for added durability.
Dual 4-ohm Voice Coils: This woofer features dual 4-ohm voice
coils, offering wiring flexibility. When the voice coils are wired in parallel the
woofer presents a 2-ohm load. When the voice coils are wired in series the woofer
presents an 8-ohm load.
Cast Aluminum Basket: The die-cast aluminum basket resists
flexing and resonance (ringing).
Terminals: The woofer features two pair of gold plated spring
post terminals. They accept pin connectors or bare wire up to 10-gauge.
Sealed Box: For the best sound quality when you're short on
space, use a sealed enclosure; the optimum internal volume is 1.0 cubic foot. Sealed
enclosures provide the most control over a woofer, will handle a lot of power, and
provide accurate sonic reproduction, making them suitable to all types of music.
Ported Box: The recommended ported box has an internal volume
of 1.5 cubic feet with a 4" diameter x 15-1/2" long port tube. Ported (or
vented) enclosures typically provide better overall efficiency than sealed so they
are suitable for use with smaller amplifiers, giving you more bass output from less
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