BS EN 50332-2:2003

Sound system equipment: Headphones and earphones associated with personal music players. Maximum sound pressure level measurement methodology Matching of sets headphones if either or both are offered separately, as one package equipment but standardised connectors between the two allowing to combine components different manufacturers design

Sound system equipment. Headphones and earphones associated with portable audio Maximum sound pressure level measurement methodology limit considerations Matching of sets headphones if either or both are offered separately