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As a line-source dipole, the midrange ribbon has a vertical dispersion
pattern identical to that of the line array of tweeters. This insulates the
listener from the room’s negative effects, and enhances the sense of
spaciousness and depth.
5.4 The Servo-bass Advantage
Very few loudspeakers use servo drive, either because most
designers think that it is too difficult to design, too expensive, or
because of the extraordinary demands a servo system makes on the
amplifier and the transducer. The history of the Genesis servo-system
started from the first introduced in the legendary Infinity™ Servo
Statik One in 1968(!) – so we know how to design and build servo
systems. The technology has been constantly updated and refined
over the past 40 years.
The concept of our servo bass system is an easy one to understand: It
employs an accelerometer as a sensor to constantly monitor the
movement of the woofer cone and continuously compares it to the
input signal. This comparison circuit instantly identifies any deviation
from the input and applies a corrective signal to compensate for any
deviation, resulting in the virtual elimination of the inherent distortion of
the woofer.
As an example, when you have a high-impact, low-bass signal that
starts and stops suddenly (for example a tympani), the inertia of the
woofer cone makes it slow to start moving, and then after it has
started moving, the momentum of the cone makes it continue to move
after the signal has stopped. The sonic result is softness, overhang,
and bloat in the bass. This results in a perceived lack of tautness and
definition, and a blurring of dynamic impact.
With the servo system, the circuit senses that the woofer is not moving
as fast as it should, and it instantaneously applies much more current
to make it move faster. When the signal stops, it senses that the
woofer continues to move when it shouldn’t be moving and applies a
counter-signal to stop the woofer faster and more effectively than an
open loop woofer could possibly respond.
Thus, the servo-drive reduces distortion and improves transient
response by making the woofer appear to be massless. Typical non-
servo woofer systems have distortion levels that exceed 10% at even
moderate levels. The Genesis servo bass system reduces this
distortion to below one percent at almost any output level. The system
also drives the woofer to constant acceleration, which makes the
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