ITU worst case for 5.1

[Kevin Austin <kevin.austin@xxxxxxxxxxxx>]

Most of the home theater 5.1 systems I have seen in friends' houses have had the speakers placed wherever there happens to be a space for them. By the definition I would take it that there is one "best" position, and several hundred bad and worst case positions. In many situations I've seen, a 1.4 meter sweet spot is unusually large.

Kevin



> Date:    Sun, 28 Mar 2010 17:24:31 -0400
> From:    Nils Peters <nils.peters@xxxxxxxxx>
> Subject: ITU worst case listening position - how?
> 
> Hi,
> 
> I hope someone from this list can help out, the ITU people could not sufficiently answer my question.
> 
> The ITU-R BS.1116-1 recommendation "METHODS FOR THE SUBJECTIVE ASSESSMENT OF SMALL IMPAIRMENTS IN AUDIO SYSTEMS INCLUDING MULTICHANNEL SOUND SYSTEMS" (p.18, Figure 7) defines the typical 5 channel surround loudspeaker setup including the best (central) and worst case listening positions.
> 
> Here my question:
> 
> What are the underlying assumptions/calculations that make these specific listening positions to the "worst case listening positions" ?
> 
> The text on the same pages also defines the recommended listening area which has a radius of 0.7 m around the central position. I am also wondering where this number comes from.
> 
> thanks for any comment.
> 
> Nils