Stereo speakers must form a 60-degree equilateral triangle around the listener

Evidence

Figure 7.1 shows the optimum layout for stereo speakers. They should form an equilateral triangle with the center of the listening position. If one has a greater angle than this the center phantom image becomes unstable— the so-called “hole in the middle” effect. Clearly, having an angle of less than 60° results in a narrower stereo image. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2241

Categorization

• DEFINE: Defines the ‘hole in the middle’ effect and the optimum stereo speaker geometry.
• corroborated: 2 independent passages support this claim — David Howard, Jamie Angus, coustics and Psychoacoustics, 2241
• XREF: connects to: Two-channel stereo only works for one centrally seated listener — , Toole, Floyd E - Sound reproduction-…, 69; Stereo loudspeakers create directional illusion through summed phase shifts mimicking time delays — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1911

Broader Connections

• Stereo loudspeakers create directional illusion through summed phase shifts mimicking time delays #expands (0.78) — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1911