2.2
WHAT THE SDEC DOES
16
Screen Correction:
The computational power of the SDEC allows it to compensate for the effects of placing the front center channel
loudspeaker behind any of several popular types of projection perforated screen material.
Figure 4:
Effect of Screen Correction EQ
Modes:
Although not a major consideration before the advent of home theater, inherent differences exist between an
idealized music-only and an idealized cinema sound reproduction system. Cinema sound is produced with using
theater speakers that employ horn-loaded compression drivers. The directivity-index of horn-loaded drivers is signifi-
cantly different from that of direct radiator designs. The best way to reproduce cinema audio is with speakers that exhibit
similar directivity characteristics.
Synthesis systems employ horn-loaded drivers for cinema and direct radiators for music.
The SDEC contains two sets of equalization curves selected by the system controller for each of the Synthesis I, II, and III
systems. Sources identified by the SDP-2 or the more recent DTS-equipped SDP-2D as music-only are fed through con-
ventional midrange cone drivers and dome tweeters; theatrical audio is automatically fed to horn-based transducers, and
equalization is changed to the appropriate settings.
Room Correction EQ:
The parameter (or, more accurately, set of parameters) more responsible for overall sound quality than almost any other is
the acoustic signature, or characteristics, of the listening environment. Absolute room dimensions, the ratio of the room
dimensions, the shape of the room, absorption/reflection characteristics of the walls, and room furnishings can make
the most expensive equipment sound mediocre or enhance the sound of mediocre equipment. In this area, the SDEC is
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