The “Missing 6 dB” of Tillman, Johnson, and Olsen Was Found - 30 Years Ago
Michael Block, Mead C. Killion, Tom W. Tillman · Seminars in Hearing · 2004
This article describes the experiments undertaken to track down the missing 6 dB that Tillman, Johnson, and Olsen reported in 1966. In keeping with earlier findings of other authors, we found that nothing was really missing. We made probe-microphone recordings of the original stimuli and obtained the same differences reported by Tillman, Johnson, and Olsen once we took into account differences between anechoic-chamber and test-booth sound fields. Historically, these differences have been rediscovered by each new generation, with the same subtle experimental errors having to be uncovered anew. KEYWORDS Missing 6 dB - thresholds - earphone thresholds - sound-field thresholds - probe microphones