Removing low frequencies from a masker progressively improves speech reception up to a ceiling

Evidence

SRTs decreased linearly with a slope of ‑0.65 dB SRT/dB attenuation indicating an improvement of speech intelligibility by filtering out the low frequencies in the masker signal. At 43-dB attenuation (ceiling value), SRTs stopped decreasing and presented an asymptote at about ‑35 dB. — Dijk, Pim van, Physiology, Psychoacoustics and…, 3569