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a bs o l u t e f i d e l i t y
When the signal stops, it detects that the woofer will continue to
move when it shouldn’t 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 seem 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. It also
drives the woofer to constant acceleration which makes its
frequency response flat!!
The servo system is a more proactive approach to controlling a
loudspeaker than high-damping factor and high current in the normal
amplifier. However, this also means that the woofer, the cables
attaching the woofer to the amplifier, and the power amplifier has to
be designed as an integrated system. Thus, the Genesis 450XS is
designed with a built-in 1000W servo amplifier for the bass section.
Aluminium-cone Woofers
The transducer used in a servo system must be strong enough to
withstand the high current approach of the servo, yet delicate and
light enough to react extremely quickly. The 450XS features two 12-
inch aluminium cone woofers per channel, mounted in a horizontally-
opposed, mass-balanced configuration.
While the servo system is able to ensure that the driver works
linearly as a perfect piston, it is unable to correct for distortion
caused by cone wobble, bending, and break-up. Hence, the drivers
were designed to minimize these non-linear distortions, allowing the
servo system to achieve maximum accuracy.
The woofers are a uniquely designed metal cone driver made for the
Genesis servo system. Made of a cone of solid aluminium, the
suspension and voice-coil have been maximized for long, distortion-
free excursion so as to increase dynamic range. Our aluminium
cones are a magnitude stiffer than any plastic or paper cone on the
market, and virtually eliminate the problems caused by cone bending
and break-up.
The lowest break-up mode (where there can be any chance of
distortion at all), is at 6,000Hz – far above the 16Hz to 180Hz
