GB/T 14475-2024 Horn loudspeakers—Measuring methods

GB/T 14475-1993 Methods of measurement for horn loudspeakers

GB/T 2423.18-2021 Environmental testing—Part 2:Test methods—Test Kb:Salt mist,cyclic(sodium chloride solution) GB/T 2423.24-2022 Environmental testing—Part 2:Test methods—Test S:Simulated solar radiation at ground level and guidance for solar radiation testing and weathering GB/T 3241-1998 Octave-band and fractional-octave-band filters GB/T 3241-2010 Electroacoustics—Octave-band and fractional-octave-band filters GB/T 3769-1983 Scales and sizes for plotting frequency characteristics and polar diagrams GB/T 3769-2010 Electroacoustics—Scales and sizes for plotting frequency characteristics and polar diagrams GB/T 3785.1-2010 Electroacoustics—Sound level meters—Part 1:Specifications GB/T 3785.1-2023 Electroacoustics—Sound level meters—Part 1:Specifications GB 4208-1993 Degrees of protection provided by enclosure (IP code) GB/T 4208-2008 Degrees of protection provided by enclosure(IP code) GB/T 4208-2017 Degrees of protection provided by enclosure(IP code) GB/T 6881-2023 Acoustics—Determination of sound power levels and sound energy levels of noise sources using sound pressure—Precision methods for reverberation test rooms GB/T 6881.1-2002 Acoustics—Determination of sound power levels of noise sources using sound pressure—Precision methods for reverberation rooms GB/T 6881.2-2002 Acoustics—Determination of sound power levels of noise sources—Engineering methods for small,movable sources in reverberant field—Part 1:Comparison method for hard-walled test rooms GB/T 6881.2-2017 Acoustics—Determination of sound power levels and sound energy levels of noise sources using sound pressure—Engineering methods for small movable sources in reverberant fields—Comparison method for a hard-walled test room GB/T 6881.3-2002 Acoustics—Determination of sound power levels of noise sources-using sound pressure—Engineering metheds for small,movable sources in reverberant fields—Part 2:Methods for special reverberation test rooms GB/T 6882-1986 Acoustics—Determination of sound power levels of noise sources—Precision methods for anechoic and semi-anechoic rooms GB/T 6882-2008 Acoustics—Determination of sound power levels of noise sources using pressure—Precision methods for anechoic and hemi-anechoic rooms GB/T 6882-2016 Acoustics—Determination of sound power levels and sound energy levels of noise sources using sound pressure—Precision methods for anechoic rooms and hemi-anechoic rooms GB/T 12060.1-2017 Sound system equipment—Part 1:General GB/T 12060.3-2011 Sound system equipment—Part 3:Methods of measurement on audio amplifiers GB/T 3241.2-2025 Electroacoustics—Octave-band and fractional-octave-band filters—Part 2:Pattern evaluation tests GB/T 3241.1-2025 Electroacoustics—Octave-band and fractional-octave-band filters—Part 1:Specifications