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Two-way
(car speaker)
Music's high frequencies can be reproduced accurately by two-way, or coaxial,
designs. These speakers use a separate crossover and tweeter to deliver high frequency
reproduction that surpasses that of dual-cone "extended range" models
with whizzer cones. This tweeter, usually a cone or a dome, is either on a post
or bridge inside the woofer.
Three-way
(car speaker)
Three-way or triaxial speakers take the separate woofer and tweeter from a two-way
design and add a dedicated midrange driver for enhanced warmth and texture. The
extra high-frequency energy also boosts overall uniformity.
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GLOSSARY
(Understanding Audio Terminology)
SPEAKERS
Choosing
Speakers
How Speakers
Work
What's A Woofer?
What's A Midrange?
What's A Tweeter?
What
Are
Two-Way,
Three-Way, & Component Speakers?
Dual-Cone, Dual-Voice-Coil & Full-Range Speakers?
Understanding Theile/Small Parameters
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Installing Neon Underbody Kits
Tools - Choosing The
Right Tools For The Job
Dual-Cone
Speakers
Some factory installed and replacement auto source speakers are of the dual
cone type. Sometimes also referred to as a "full-range" speaker,
it uses an inexpensive, but efficient design. The small "whizzer"
cone attached to the center of the main cone extends the high frequency range,
but not with the wide dispersion or intensity of a separate tweeter driver.
The main advantage of such speakers lie in their low cost.
Dual-Voice-Coil Or Dual-Channel Speakers
These
are woofers with two separate voice coils mounted on a cylinder connected
to a common cone. These are most often interconnected so as to allow the
woofer to handle a lower impedance load at it's optimal power capacity.
They can also be connected to separate amplifiers in order to produce a
common bass wave from two amplifier channels through a single woofer. Since
bass has a non-directional character, this does not interfere with the optimum
reproduction of the stereo image in the other speakers.
Thus, a correctly configured single driver can often provide as much bass
as multiple drivers, and in a smaller enclosure.
Great care should be taken in making connection from the amplifier, to observe
proper polarities, especially when conected to separate channels. Failure
to do so, can result in the quick extinction of the driver
if the amplifiers are pulling the voice coil form in different directions
at once.
Impedances for these speakers can be configured in a variety of values including
different levels for each one. The most popular format is to have each coil
optimized for 4 ohms, although 6, 3, 2, and even 1 ohm coils are not uncommon.
Some specialized units may have 4 and 2, or 8 and 4 ohm coils, although
these are fairly rare and usually proprietary designs.
The same considerations of enclosure volume, power handling, and frequency
response apply to these drivers as they do to all others.
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