Sony DVP-NS999ES - Manual (Page 33)

ES Series DVD-Video/CD/SA-CD Players; Version 3.0 Page 33
addressed this by creating a hermetic shutter. It forms an airtight seal to protect
the disc and pickup from air-borne vibration. Even when the speakers in your
room are going full blast, the disc rotates in peace and quiet.
To seal off the mechanism from air-borne vibration, the inner shutter
descends into position during disc playback.
BMC Mechanical Deck (DVP-NS999ES)
The base unit is mounted on a sub-chassis called the mechanical deck.
On the DVP-NS999ES, this is a rigid, honeycomb structure of Sony's Bulk
Molding Compound (BMC). Long a fixture in Sony anti-resonant design, BMC is
carefully formulated for high strength and high internal loss. Like steel, it has the
rigidity required for its structural purpose. But unlike steel, BMC steadfastly
resists vibration and resonance. BMC consists of calcium carbonate (a principal
component of marble), glass fiber reinforcement and unsaturated polyester. The
material is subjected to thermosetting and is formed into the mechanical deck
floor, walls and ceiling. Even the disc loading tray is made of non-resonant BMC.