Genesis I.C.E. 928 - Manual (Page 14)

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The best amplifier for this application is a Class-D switching amplifier.
One of the reasons is dramatically increased efficiency, especially at
the lower frequencies. The typical Class A/B amplifier is only 50%
efficient. A Class-D amplifier, on the other hand, can be 90% efficient.
A Class-D amp puts out more power and less heat, and with less
power consumption, and is ideal as an amplifier for a subwoofer.
In the Genesis 928, we use a proprietary ultra-efficient discrete
MOSFET switching amplifier with output capability of up to a full
kilowatt. The design provides extraordinary control with high-damping,
and great thermal stability so that you can play the most demanding
sources continuously at high volume.
The Transducers
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 G928 subwoofer features
two side-firing 12-inch woofers that are designed with aluminum cones,
which are lightweight and yet inherently stiff. Our aluminum cones
exhibit no resonance or cone flexure anywhere near the frequencies
that the 928 operates at.
The lowest break-up mode (where there can be any chance of
distortion at all) is at 6,000Hz – far above the 25Hz to 120Hz frequency
response of the G928. Therefore, the driver is a perfect piston within
the frequencies used. Thus, extremely low cone breakup distortion is
inherent in the driver that we designed for the Genesis 928 Subwoofer.
The Cabinet
Having two side-firing woofers in phase, means that the cabinet is
inherently balanced. This also contributes to dramatically reduced
distortion caused by cabinet vibrations. Moreover, when the T-rex
stomps across the screen, you can be assured that the G928 won’t
hop along!