Genesis Advanced Technologies 2JR - Manual (Page 23)

Ver 1.0 Sep 2011
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a bs o l u t e f i d e l i t y ®
The isolation, plus vibration-cancellation results in a stable, solid
image even when there is heavy bass content in the music.
Servo-controlled Bass Amplifier
One problem, however, of metal cones, is that of greater mass –
even ones as light as the ones used by Genesis. To over come
this, we had to build an amplification system of great power, and
high damping factor. The servo-system also places extraordinary
demands on the amplifier because the system uses enormous
amounts of current to make the woofer follow the input signal. This
means that the amplifier used must efficiently deliver extraordinarily
large amounts of clean power into low impedances.
The servo-controlled bass is a holistic system of woofers,
acceleration sensors, servo-feedback circuits, crossover circuitry
and amplifiers. Two separate Class D amplifier modules are used
in each of the left and right loudspeakers (a total of four!).
Specially designed and tuned Dynamic Power Delivery System
(DPDS) power supplies are used
– one for each speaker with two
channels – to deliver balanced dynamics which are critical to bass
accuracy. This improves the power factor of the power supply in
delivering the bass f
requencies, resulting in “floorshakingly musical”
bass to power the servo woofers.
One side benefit of this powered woofer system is that almost
“any”
sized amplifier can be used to drive the mid/tweeter section of the
Genesis 2 junior. No longer must one choose between having an
amplifier with enough power to drive the woofers, and a smaller
amplifier having better spatial and tonal characters. Nevertheless,
we do recommend no less than 100 watts as a minimum for the
midrange/tweeter sections.
The Acoustic Suspension
The suspension for each loudspeaker comprises three elements:
1) The neoprene vibration absorbers are tuned to isolate and
decouple the loudspeaker cabinet for optimal imaging and
bass response no matter what surface the loudspeaker sits
on. More neoprene vibration absorbers are tuned to isolate
the woofer cabinet from the rest of the loudspeaker
structure.