orthophonic
/ˌɔːθə(ʊ)ˈfɒnɪk/adjective
1 Linguistics. Of or relating to orthophony. rare.
2Of a phonographic system: reproducing sounds correctly. Also as noun: an orthophonic phonograph.
Origin
Late 19th century; earliest use found in The Spirit of the Times: a chronicle of the turf, agriculture, field sports, literature and the stage. From ortho- + -phonic, after orthophony.