Sixty degrees total between speakers is the recommended angle for ideal stereophonic listening.

Evidence

Figure 7.3 shows the predicted angle as a function of the relative levels of the left and right loudspeakers for a θloudspeakers = 30°. This corresponds to a total angle between the loudspeakers, which is the recommended angle for ideal stereophonic listening. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2208

Categorization

• SHARE: A concrete setup spec worth passing to anyone tidying their studio monitor placement.