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2. Loudness compensation - Wikipedia

   en.wikipedia.org/wiki/Loudness_compensation

   Audio level at a listener's ears depends on the listening environment, listener position, speaker sensitivity as well as amplifier gain. For loudness compensation to work correctly the playback system must also accurately assume what volume level was used in mastering .

3. Tone control circuit - Wikipedia

   en.wikipedia.org/wiki/Tone_control_circuit

   Tone control is a type of equalization used to make specific pitches or frequencies in an audio signal softer or louder. It allows a listener to adjust the tone of the sound produced by an audio system to their liking, for example to compensate for inadequate bass response of loudspeakers or earphones, tonal qualities of the room, or hearing impairment.

4. Soundcraftsmen - Wikipedia

   en.wikipedia.org/wiki/Soundcraftsmen

   Soundcraftsmen equalizers and their compact "brick" style power amplifiers gained a sizable following among audiophiles during the 1970s and 1980s. All Soundcraftsmen equalizers and amplifiers were made at the company's Santa Ana, California facility. In the early 1970s they also sold a solid-state stereo receiver, but only through the Fedco ...

5. Line level - Wikipedia

   en.wikipedia.org/wiki/Line_level

   Most phonograph cartridges also have a low output level and require a preamp; typically, a home stereo integrated amplifier or receiver will have a special phono input. This input passes the signal through a phono preamp, which applies RIAA equalization to the signal as well as boosting it to line level.

6. Preamplifier - Wikipedia

   en.wikipedia.org/wiki/Preamplifier

   An example of a typical high-end stereo preamplifier.. A preamplifier, also known as a preamp, is an electronic amplifier that converts a weak electrical signal into an output signal strong enough to be noise-tolerant and strong enough for further processing, or for sending to a power amplifier and a loudspeaker. [1]

7. Equalization (audio) - Wikipedia

   en.wikipedia.org/wiki/Equalization_(audio)

   Stereo 31-band 1/3-octave graphic equalizer for use in sound reinforcement applications. In the graphic equalizer, the input signal is sent to a bank of filters. Each filter passes the portion of the signal present in its own frequency range or band. The amplitude passed by each filter is adjusted using a slide control to boost or cut frequency ...