Control of earphone produced binaural signals

While most people keep a high attention to the significance of the binaural recording method, whether it is e.g. individual or non-individual (as e.g. artificial head recording), many pay less attention to the type of earphone used to reproduce the binaural signals, and to the accurate control of the ideal 1:1 reproduction of the signals at the eardrum. This paper will review the theory of correct earphone reproduction and how the electroacoustic transmission chain may be appropriately equalized. Examples will be given within particular contexts, and the problems of controlling the sound transmission and reproduction on in-ear earphones will be discussed.