Scientific American reported: "Every one who has been fortunate enough to hear the telephones at the Palais de l'Industrie has remarked that, in listening with both ears at the two telephones, the sound takes a special character of relief and localization which a single receiver cannot produce....
Ajakiri Scientific American teatas: "Igaüks, kellel oli õnne kuulda telefone Palais de l'Industrie's, on märkinud, et kahe kõrvaga kaht telefoni kuulates on helil eriline reljeefsus ja lokaliseeritus, mida ühe vastuvõtjaga luua ei saa ...