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a bs o l u t e f i d e l i t y
This results in a perfect line-source ribbon generating a continuous
and perfectly coupled wave front. The benefit of this to the listener is
a wide and even horizontal dispersion yielding a large and highly
stable sweet spot.
Mid-Bass Couplers
In order to create a “sound bridge” between the midrange ribbon and
the bass section, the 450XS incorporates two 6.5inch metal cone
mid-bass couplers. One front and one rear firing, again working as a
dipole.
Made of aluminum, this metal cone is extremely light and stiff. The
driver is hence capable of handling the huge dynamic range
demands of the system while maintaining extremely low coloration
and excellent transient response.
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. However, the Chief Scientist of
Genesis, Arnie Nudell, first introduced the servo system in the
legendary Infinity Servo Statik One in 1968(!) – so we know how to
design and build servo systems.
The concept of the Genesis 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 instantaneously
compare it to the input signal. This comparison circuit identifies any
deviation from the input, and instantaneously applies a corrective
signal to compensate, thus practically eliminating 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 is
moving, the momentum of the cone makes it continue moving even
after the signal has stopped.
The sonic result is overhang, bloat, 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.
