2-Way,
3-Way & Component Speakers

Two-way
(car speaker)
Music can be reproduced with reasonable accuracy by
two-way, or coaxial, designs. These speakers use a separate crossover
and tweeter to deliver high frequency reproduction that surpasses that
of single cone or dual-cone "extended range" models with whizzer
cones. The tweeter, usually a cone or a dome,
is mounted either on a post or bridge inside the front of the woofer
cone. While our illustration shows a 6X9 oval speaker, the design is
readily available in most oval and round sizes.

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 coverage of the vital middle frequency area. The filling
effect of this extra mid-frequency energy can also boost overall uniformity.
Four Way speakers add a small "super tweeter"
to extend the high range frequency response out to 22 to 25 Kilohertz,
This is not so advantageous as it might seem. Very few people can hear
sounds above 15 Khz, and in a relatively noisey car environment, such
sounds could easily be obscured by road and ambient car noise.
Bridge
& Post Mounted (2 & 3-way speakers)
In combined 2 and 3-way speakers, which have woofers together with a
Tweeter, or a Tweeter and a Midrange driver,
the smaller drivers are attached to the woofer by either one of two
standard mountings:
The bridge-mount
method has a metal or plastic bridge running from one side of
the woofer's outer perimeter to the other. The smaller driver or drivers,
together with the crossover
network, is then mounted on the bridge. The advantage of this arrangement
is that the woofer center dome is left intact with no exposure of the
voice coil or other internal elements. On the negative side there is
more covered surface area that marginally reduces the output at certain
frequencies, and it may be little more difficult to mount the unit.
The
post-mount method provides a post
that is attached to the center of the inner magnetic pole, to which
the other drivers are then mounted. It has a reduced obstruction to
woofer dispersion, but it can require a hole in the dust
cover/cap that could give environmental access to the woofer's
inner workings. This creates the possibility of operational degradation
from accumulations of dust over time, unless a flexable cover is provided.

Component
Speaker Systems
This term is used to indicate a system in which separate mounting arrangements
are provided for each component of the system. In a typical car system,
you might see mid or full range drivers at the side, and tweeters mounted
on the dash panel. A pair of crossover circuits delivers separate signals
to each driver. In some arrangements, a bass system driven by its own
amplifier compliments and completes the system. This compares to the
typical integrated speaker enclosure in which all the drivers
are mounted in the same box or assembly.