Yamaha RX-V670 - Manual (Page 19)

19
Notes on Operation of Sound Field Programs
● In the CONCERT VIDEO, MONO MOVIE, ROCK CONCERT
and CONCERT HALL modes, no sound is heard from the
center speaker.
● When a monaural sound source is played in the DOLBY
PRO LOGIC or ENHANCED mode, no sound is heard from
the front speakers and the rear speakers. Sound is heard
only from the center speaker. However, if the center mode is
in the PHANTOM, the front speakers output the sound of the
center speaker.
● If you connect an external amplifier to this unit, see if it has
built-in surround sound or ambience circuitry. If it does, then
be sure that the surround or ambience circuitry on that
amplifier is off while you are using the digital sound field
processor’s Dolby Pro Logic Surround decoding function.
● When this unit is in the Dolby Pro Logic Surround mode, if
the main-source sound is considerably altered by
overadjustment of the BASS or TREBLE controls, the
relationship between the center and rear channels may
produce an unnatural effect.
Description of Dolby Pro Logic Surround
DOLBY PRO LOGIC SURROUND: This unit employs the
Dolby Pro Logic Surround system. This system is similar to
professional Dolby Stereo decoders used in movie theaters.
By employing a four-channel system, the Dolby Pro Logic
Surround system divides the input signals into four levels: the
left and right main channels, the center channel (to characterize
dialog), and the rear surround-sound channels (to characterize
sound effects, background noise and other ambient noise).
Dolby Surround is encoded on the sound track of commercially
available video cassettes and video discs as well. When you
play a source encoded with Dolby Surround on your home video
system, the Dolby Pro Logic Surround mode on this unit
decodes the signal and feeds the surround-sound effects.
The Dolby Pro Logic Surround mode may not be always
effective on video sources not encoded with Dolby Surround.
Manufactured under license from Dolby Laboratories Licensing
Corporation. Additionally licensed under one or more of the
following patents: U.S. numbers 3,632,886, 3,746,792, and
3,959,590; Canadian numbers 1,004,603 and 1,037,877.
“Dolby” and the double-D symbol are trademarks of Dolby
Laboratories Licensing Corporation.