Definition of Engineering Phrases
"A" "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

Midrange Control

An audio Midrange control combines both a Base control and a treble control in the same circuit, just as the Tone control does. Midrange adjustments are found on higher-end audio gear in addition to a Treble and Bass Control. However the usage of a Midrange has faded and no longer found on modern audio gear. The midrange control is added in addition to both the treble and base control, or used instead of the other controls to save money and space.

Audio Midrange Control
Midrange Adjustment

In this case potentiometers are coupled within the same potentiometer case, so adjusting one also adjusts the other [one knob, but having separate resistive wipers. That is one knob controls both the treble and bass circuits. Refer to the pages on the Base and treble circuits for possible values to implement in the filter elements.

Related Circuits;
Base Control, Passive Filter.
Treble Control, Passive Filter.
Tone Control, Passive and Active Filter.
... 2-Band Active Tone Control
... 3-Band Active Tone Control
Loudness Switch Control.
Passive Audio Crossover Networks.
Active Audio Mixer.

Because Midrange controls are no longer used, the schematic doesn't provide any circuit details. However there are circuit elements that are defined on the Base and Treble control pages. The Op Amp is shown with a Feed-back resistor, but the feedback is really the passive midrange circuitry, so it's not really required. A good design might also show a compensating resistor in the negative Opamp leg, but was left out for space reasons.

A transistor could also be used as an Audio Amplifier in place of the operational amplifier.

PC motherboard

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