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ACTIVE SERVO TECHNOLOGY
E-3
The theory of the Active Servo Technology is based upon two
major factors, the Helmholtz resonator and negative-
impedance drive. Active Servo Processing speakers
reproduce the bass frequencies through an “air woofer”,
which is a small port or opening in the speaker’s cabinet.
This opening is used instead of, and performs the functions
of, a woofer in a conventionally designed speaker system.
Thus, signals of low amplitude within the cabinet can,
according to the Helmholtz resonance theory, be output from
this opening as waves of great amplitude if the design is such
that the size of the opening and the volume of the cabinet are
in the correct proportion to satisfy a certain ratio.
In order to accomplish this, moreover, the amplitudes within
the cabinet must be both precise and of sufficient power
because these amplitudes must overcome the “load”
presented by the air that exists within the cabinet.
Thus it is this problem that is resolved through the
employment of a design in which the amplifier functions to
supply the signals. If the electrical resistance of the voice coil
is reduced to zero, the movement of the speaker unit would
become linear with respect to signal voltage, and, to
accomplish this, a special negative-impedance output-drive
amplifier for subtracting output impedance of the amplifier is
used.
By employing negative-impedance drive circuits, the amplifier
is able to generate precise, low-amplitude low-frequency
waves with superior damping characteristics, and these
waves are then radiated from the cabinet opening as high-
amplitude signals. The system can, therefore, by employing
the negative-impedance output drive amplifier and a speaker
cabinet with the Helmholtz resonator, reproduce an extremely
wide range of frequencies (28 Hz – 20 kHz) with amazing
sound quality and less distortion.
The features described above, then, are combined to be the
fundamental structure of the Active Servo Technology.
High-
amplitude
bass
sound
Air woofer
(Helmholtz resonator)
Active Servo
Processing
Amplifier
Signals
Signals of low amplified
Negative-impedance
output drive
Cabinet
Port