User Manual

Multichannel Monitoring Tutorial Booklet (M2TB) rev. 3.5.2

Masataka Nakahara : SONA Corporation

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3-2. L, R

We will c onsider two angles of separation for the L-R speakers; 60° and 45°.

If we want to emphasize compatibility with conventional two-channel systems such as used for music

playback, we give priority to the 60˚ placement. If the playback environment of the end use is primarily

post-production for TV or movie theater, we usually give priority to the 45˚ placement.

However it is not the case that there is a clear division, with film sound using a spread of 45˚ and music

using a spread of 60˚. For example, most production workplaces for broadcast programs are based on the

ITU-R playback environment (60˚). The placement of 45˚ for film and 60˚ for music is a principle that

applies in most situations, but in other post-production or broadcast program production situations, it is

necessary to consider a placement that suits the intentions of the prodution. In the case of audio playback

that accompanies video, it is important to consider not a numerical value of 45˚, but rather a placement

that takes into account the matching of the video with the audio. The spread of 45˚ that we mention here

is one example of a placement angle often used when consideration is given to matching video and audio.

Regarding the placement height, it is desirable that elevation angle from the listening point be within 15˚.

If the L/R speakers are placed higher than 15˚, the phantom image generated by L and R tends to blur.

[Fig. 21] Wide angular spacing between L and R; 60-degree and 45-degree

60°

45°

Video

Audio