Standard Number: BS ISO 226:2003 Title: Acoustics. Normal equal-loudness-level contours Status: Current Publication Date: 2003/09/03 Cross References: ISO 266, Replaces: BS 3383:1988, International Relationships: ISO 226:2003 Identical Supersedes Draft: 01/562685 DC Descriptors: Acoustics, Equal loudness level, Hearing (auditory perception), Audibility, Sound intensity, Audiofrequencies, Auditory threshold, Acoustic measurement, Equations, Acoustic properties and phenomena, Noise (environmental), Volume (sound), Acoustic waves