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2. Hafler circuit - Wikipedia

   en.wikipedia.org/wiki/Hafler_circuit

   Named after its early proponent audio engineer David Hafler, the circuit exploits the high amount of stereo separation between Left and Right channels and sound phase. [2] This type of system is called 2:2:4, since the rear channels are simulated from a two-channel stereo track, with no actual extra tracks encoded. The rear channels will ...

3. David Hafler - Wikipedia

   en.wikipedia.org/wiki/David_Hafler

   The crosstalk or loss of stereo separation in the front speakers was generally less than 2 dB, while the rear sound level in a typical recorded live performance was about 7 dB below the front, but clearly audible. The Dynaco QD-1 Quadaptor was based on this idea, adding a variable resistor to control the volume of the rear speakers.

4. C-QUAM - Wikipedia

   en.wikipedia.org/wiki/C-QUAM

   The L+R audio can be extracted from either the AM (stage 1) or the PM (stage 2) modulation component. From there, the audio can be readily de-multiplexed (de-muxed) back to 'stereo', a.k.a. Left and Right channels. For additional information, see the attached PDF: "Introduction to the Motorola C-QUAM AM Stereo System". [1]

5. Stereophonic sound - Wikipedia

   en.wikipedia.org/wiki/Stereophonic_sound

   Two microphones set up to record a piano simultaneously, which creates a stereo sound. Stereo sound systems can be divided into two forms: the first is true or natural stereo in which a live sound is captured, with any natural reverberation present, by an array of microphones.

6. Stereo Quadraphonic - Wikipedia

   en.wikipedia.org/wiki/Stereo_Quadraphonic

   The early SQ decoders could not produce more than 3 dB of separation from front to back. Early "Front-rear logic" circuits were introduced to enhance separation to 12 dB and later "Full logic" [4] circuits 20 dB, [5] but both provided poor performance, very noticeable gain-pumping and an unstable 'swaying' sound field.

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9. Vectorscope - Wikipedia

   en.wikipedia.org/wiki/Vectorscope

   One stereo channel drives the horizontal deflection of the display, and the other drives the vertical deflection. A monaural signal, consisting of identical left and right signals, results in a straight line with a gradient of +1. Any stereo separation is visible as a deviation from this line, creating a Lissajous figure. If a straight line ...