標準號：IS 7741 Pt.2-1975
發布日期：1976/1/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 This standard specifies the performance requirements for direct radiator permanent magnet moving coil loudspeakers regarding its acoustical, electrical, mechanical and climatic properties.1.2 Unless otherwise stated, the loudspeaker shall be understood to include both loudspeaker elements and loudspeaker systems comprising one or more loudspeaker elements and such relevant devices as built-in cross-over fiters, transformers and any other passive elements.1.3 Dimensional requirements are not covered in the standard.