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ES DVD Players 2005, Version 4.0 Page 40
New Base and Pillar (NBP) chassis (NS9100ES)
Where some see the chassis as an empty box, ready to be filled with
circuitry, Sony® ES engineers see a vital contributor to sound quality. Our
engineers understand that the chassis can become a pathway for vibration that
can subtly modulate wiring paths, resistance and capacitance values. All of this
adds up to unwanted distortion. That's why the DVP-NS9100ES is built upon the
formidable foundations of Sony's New Base and Pillar (NBP) chassis.
In Sony's previous Base and Pillar (BP) chassis, pillars stand on a metal
panel base, to which side and top panels are installed. This design bolsters the
strength of the bottom panel (the base), achieving high rigidity in a simple
structure. The BP chassis also has the advantage of creating a large space in
which the major subassemblies can be laid out with ease.
The New Base and Pillar (NBP) chassis of the DVP-NS9100ES is a
significant refinement of this classic Sony design. New L-shaped side walls
further increase the rigidity of the chassis, reduce resonance and free up internal
area.
Front view (left) and side view (right) of Sony's Base and Pillar (BP)
chassis. It's supremely strong to suppress resonance.
Off center insulator feet (NS9100ES)
To prevent shelf-borne vibration from entering the chassis, Sony's
insulator feet locate the screw hole off center. Varying the radius from screw to
perimeter tends to vary the resonant frequency within the foot. In this way,
vibrations coming from the bottom of the insulator act to cancel each other when
they reach the screw mount.