Sound system equipment - Part 11: Application of connectors for the interconnection of sound system components (IEC 60268-11:1987 + A1:1989 + A2:1991); German version HD 483.11 S3:1993
Sound system equipment - Part 15: Preferred matching values for the interconnection of sound system components (IEC 60268-15:1987 + A1:1989 + A2:1990 + A3:1991); German version HD 483.15 S4:1992