Mechanized positional substitution enabled fast double-blind loudspeaker product testing

Evidence

In an engineering environment it was important that these data be available quickly, so as not to delay the development of products. We were fortunate to have a budget that permitted building a custom listening facility, a soundproofed room, including a positional substitution mechanism that would allow for rapid comparisons of mono, stereo or L, C, R multichannel loudspeaker configurations. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1106