Stereo won commercially because LP grooves could only store two channels

Evidence

Adding more channels allows for a soundstage, conveyed by the front channels: the lateral spread of the orchestra, with depth. There is also a more subtle component: apparent source width (ASW), or image broadening, wherein sounds acquire dimension, and an acoustical setting; some call it “air” around the instruments. Two channels suffice for a single listener in the symmetrically located “stereo seat,” but multiple listeners or a single listener not in the stereo seat require the addition of a center channel to prevent the phantom image soundstage from distorting and ultimately collapsing to the nearer loudspeaker. — , Toole, Floyd E - Sound reproduction-…, 69 (#qualifies, via linked claim)

Categorization

  • XREF: connects to: Two-channel stereo only works for one centrally seated listener — , Toole, Floyd E - Sound reproduction-…, 69

Broader Connections