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17
head. Some may suggest that this is the place to
save money and purchase small, inexpensive
speakers. If you choose to do so, be prepared
to upgrade in the future as discrete multi-channel
digital encoding is proliferating rapidly and the
demands on surround speakers have increased.
Subwoofer
With any good surround system you will need high-
quality subwoofers (the .1 in a 5.1, 6.1, or 7.1
channel surround system). Most movie soundtracks
contain large amounts of bass information as part of
the special effects. Good subwoofers will provide a
foundation for the rest of the system.
electrostatIc advantages
How can sound be reproduced by something that
you are able to see through? Electrostatic energy
makes this possible.
Where the world of traditional loudspeaker
technology deals with cones, domes, diaphragms
and ribbons that are moved with magnetism, the
world of electrostatic loudspeakers deals with
charged electrons attracting and repelling each other.
To fully understand the electrostatic concept, some
background information will be helpful. Remember
when you learned in a science or physics class
that like charges repel each other and opposite
charges attract each other? Well, this principle is
the foundation of the electrostatic concept.
An electrostatic transducer consists of three pieces:
stators, the diaphragm and spacers (see figure
16). The diaphragm is what actually moves to
excite the air and create music. The stator’s job
is to remain stationary, hence the word stator,
and to provide a reference point for the moving
diaphragm. The spacers provide the diaphragm
with a fixed distance in which to move between
the stators.
As your amplifier sends music signals to an
electrostatic speaker, these signals are changed
into two high-voltage signals that are equal in
strength but opposite in polarity. These high
voltage signals are then applied to the stators.
Figure 16. Cut away view of an electrostatic
transducer. Notice the simplicity due to minimal
parts usage.
Figure 17. Cut away view of a typical moving
coil driver. Notice the complexity due to the high
number of parts.
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