TWEETERSpeaker for the reproduction of high frequency soundsWOOFERSpeaker for the reproduction of low frequency soundsNEODYMIUMChemical element of the lanthanide family, symbol ND, atomic number 60, atomic weight 144.24Found naturally mixed with other metals (max 18%) like lanthanide, cerium, etc.Used to colour glass (violet) and, in particular for its properties as a permanent magnet in the compound Nd2Fe14B.RDS (RADIO DATA SYTEM)Radiodiffusion system for data in conjuction with FM broadcasting station radio signalsAF (ALTERNATIVE FREQUENCY)Function for RDS broadcasters: automatic switching from one frequency to another with better receptionTP (TRAFFIC PROGRAM)Specific signal from an RDS broadcaster transmitting traffic news