User Manual

Multichannel Monitoring Tutorial Booklet (M2TB) rev. 3.5.2
Masataka Nakahara : SONA Corporation
©2005 YAMAHA Corporation, ©2005 SONA Corporation
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3. Height of each speaker = 1.2 m (listener ear height)
The surround speakers (LS, RS) may be placed higher than L, C, and R as long as the elevation angle is
within 15˚.
Surround speakers (LS, RS) are placed at the sides rather than at the rear. It is said that this type of
placement (at the sides toward the rear) is able to provide more information to the human auditory system.
It is one of the most effective placements in order to supply information that is lacking in conventional
L/R two-channel playback. However, it is difficult for this type of horizontally-located surround speaker
placement to provide a sound image that has depth in the backward direction.
3-1-2. Regarding placement of the image
Rec. ITU-R BS. 775-1 contains the following note regarding the relationship of the L/R sound image
width and the width of the video image.
The screen of a TV image has often been found to be the size shown in [Fig. 20], which is narrower than
the width of the L/R sound image (60 degrees). (The discrepancy “B” between the visual image and the
sound image is 13.5 degrees (HDTV) or 6 degrees.)
On the other hand in a film playback environment, it is usually the case that the angle of L/R sound image
spread is the same as the angle of the visual image spread, producing a difference in mixing for TV and
for film. For improved compatibility between TV mixing and film mixing, it is good to use a larger TV
screen.
[Fig. 20] Placement of the video image :Rec. ITU-R BS. 775-1
L
C
R
RS
60°
LS
33
（
°
）
HDTV
A
BB
Screen
A :
48°
d
or
×
3
（
H
）
HDTVd :
×
2 Hor
（
13.5°
）（
HDTVB :
6
）
°
（
or
）
H ; Height of the screen