mhardy6647
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This was the way Yamaha's variable loudness worked, FWIW. Essentially a midrange cut control.
From the CR-2020 manual, ca. 1977.
Photo of a Yamaha R-1000 (ca. 1981, give or take) showing the volume & loudness pots.
Variable loudness of this kind was fairly common on integrated amplifiers in the 1950s and 1960s, e.g., EICO, Sherwood, and others that don't immediately come to mind.
The idea is to set the volume control to the loudest listening level that the end-user would ever require with the loudness control set to flat. Thereafter, the actual listening level should be set by changing the loudness control only, without changing the volume control.
From the CR-2020 manual, ca. 1977.
Photo of a Yamaha R-1000 (ca. 1981, give or take) showing the volume & loudness pots.
Variable loudness of this kind was fairly common on integrated amplifiers in the 1950s and 1960s, e.g., EICO, Sherwood, and others that don't immediately come to mind.
The idea is to set the volume control to the loudest listening level that the end-user would ever require with the loudness control set to flat. Thereafter, the actual listening level should be set by changing the loudness control only, without changing the volume control.