Technical information

DVD+RW A rewritable (i.e. recorded material can be erased or over-written)
recordable DVD.
DVD Video Digital Versatile Disc - Video. This is the form of DVD which primarily
holds DVD Video material, movies or music videos. All the DVD Video material
resides in a folder on the disc called 'VIDEO_TS'.
DVD-VR A recording mode offered for DVD-RW discs which differs from the
standard DVD-Video mode. It allows significant levels of editing of recordings on
the disc, at the cost of very limited compatibility with standard DVD players.
DVD+VR The recording mode provided for DVD+RW and DVD+R discs on
consumer DVD recorders. While somewhat different to the standard DVD-Video
mode used with commercial discs, it still provides for good compatibility with
standard DVD players. On DVD+RW discs it allows significant levels of editing of
recordings, while still retaining that good compatibility, and eliminating the need to
'finalise' the disc (DVD+R discs must still be finalised).
DXD Digital eXtreme Definition. A PCM-like high-resolution audio encoding scheme
for professional editing.
Dynamic power In some respects dynamic power is a similar measure to PMPO,
but remains far more realistic. It is quoted in conjunction with continuous power
outputs and shows how much power the amplifier or receiver can deliver for a
very brief instant, such as when a crescendo is played in music. An amplifier with
a reasonably low continuous power output can often sound quite good at
reasonably high levels if it has a high dynamic power rating.
Dynamic range The differences in the volume level between the loud bits and the
quiet bits of a music replay or sound on a movie. The term is also used as a
specification for DVD and CD players. In this sense it means the range between
the loudest and the quietest sounds that the player is capable of producing, and is
determined by the noise floor of the player and the medium.
Dynamic range control A facility in Dolby Digital to reduce the dynamic range of
the audio content in order to allow the entire program to be heard in adverse
conditions. It does this by reducing the loudness of the parts of the program
which are louder than the level set by the dialog normalization setting, and
boosting those parts quieter than that setting. The parameters for reductions are
carried in Dolby Digital metadata. This feature is useful for appreciating movies
without disturbing neighbours, and when the audio from a DVD is being heard
through a limited sound system. In particular, if DRC is available on a DVD player,
it should always be switched on if a drivers for higher frequencies. The drivers in
some compact subwoofers deliver an excursion of up to 50mm. This wide