User Manual

Multichannel Monitoring Tutorial Booklet (M2TB) rev. 3.5.2

Masataka Nakahara : SONA Corporation

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3-3. LS, RS

For the surround speakers (LS, RS), we have two types; a “direct surround” environment or a “diffuse

surround” environment ([Fig. 22]).

Direct surround is a method in which the pair of surround speakers is aimed directly at the listening point.

Diffused surround, on the other hand, does not have pin-point sound source localization for the surround

speakers. It is a placement method for expanding the coverage area. Movie theatres are an example of

this.

[Fig. 22] Direct surround environment, Diffuse surround environment

＋＋

＝＝

ITU (100°〜120°) 135°

150°

SUB

LS RS

SUB

RSLS

Side

Rear

「Surround stereo image」

「Playback image

」

「Surround panning」

GOOD

「Sound field」

Shallow back

Split (front and back)

Broad surround area

GOOD

Smooth

Direct Surround Environment

Diffuse Surround Environment

Advantages

・Precise sound field image

・Ambient, Fly-over (dynamic)

・Interchangeability of various playback environments

・Narrow listening area

・Ambiguous phantom images

Drawbacks

GOOD