Genesis Advanced Technologies 2.2 - Manual (Page 30)

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a bs o l u t e f i d e l i t y
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 frequency response of the woofer anechoically flat to
the lowest frequencies.
The Woofer Tower
The transducer used in a servo system must be strong enough to
withstand the high current approach of the servo, and yet delicate
and light enough to react extremely quickly. The G2.2 features a
total of four front- and four rear-firing 8-inch woofers per channel –
a total of sixteen woofers in the system.
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.
The woofers are a uniquely designed metal cone driver made for
the Genesis servo system. Made with a cone of solid aluminium,
the suspension and voicecoil have been maximized for long
distortion-free excursion so as to increase dynamic range. Our
aluminium cones are a magnitude stiffer than any plastic cone on
the market, and virtually eliminate the problems caused by cone
bending and break-up.
The lowest break-up mode in the woofer (where there can be any
chance of distortion at all) is at 6,000Hz – far above the 16Hz to
120Hz frequency range that these drivers operate at. Therefore,
the driver is a perfect piston within the frequencies used. Thus,
extremely low cone break-up distortion is inherent in the driver that
is designed for the Genesis servo-bass system.
Unlike the midrange and the tweeters, the front and rear woofers
operate in phase as a bipolar arrangement in which all sixteen
operate in unison to control the air mass of the entire room. This
means that the surface area of the eight cones and the large