My V-M phonograph, console, amplifier has “tone-o-matic” and “acoustic contour” controls. What do these do?
A6-7: Our ears do not hear all frequencies the same at all volume levels. The “tone-o- matic” control boosts highs and lows at low sound levels. Beyond the mid point of its rotation, this control operates as a volume control only. More modern equipment with a “loudness” control also has this same functionality built in. The “acoustic contour” control has settings of S (small), M (medium), and L (large) room sizes. According to the sales literature, it shapes the music to fit the room, to solve the problem of decreasing fidelity at increased volumes. The Owner’s manual explains how to use the control.
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