
1) Hi-fi fraud
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https://www.crosswordclues.com/clue/stereophony

reproduction of sound
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http://phrontistery.info/s.html

a sound control, recording, transmission, or reproduction technique capable of providing the listener with a sensation of spatial distribution of sound sources NOTE - Stereophony can be obtained for instance by using two separate microphones or groups of microphones, and two loudspeakers or groups of loudspeakers in different locations.
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=723-03-43

stereophony Stereophonic reproduction; stereophonic sound. Cross references of word families related directly, or indirectly, to: 'talk, speak, speech; words, language; tongue, etc.': cit-; clam-; dic-; fa-; -farious; glosso-; glotto-; lalo-; linguo-; locu-; logo-; loqu-; m...
Found on
http://www.wordinfo.info/words/index/info/view_unit/2737/17

the state or condition of being stereophonic.
Found on
https://www.infoplease.com/dictionary/stereophony
No exact match found.