Speech volumes on Bell System message circuits — 1960 survey

Speech volumes of customers on Bell System message circuits have been measured at class 5 offices. Data are presented for intrabuilding, inter-building, tandem and toll connections. Average speech volumes are lowest for intrabuilding calls and increase in level for the other types of connections, with volumes on toll calls being the highest. In general, volumes on business calls are higher than those on social calls, and men speak louder than women. Speech volumes remain substantially the same in locations comparable to those in a survey made in 1950