The level of acoustics and characteristic index that sound system of hall hall enlarge designs

National level " sound system of enlarge of GYJ125 hall hall is acoustics and characteristic index " , it is the lowermost level that after as electroacoustic enlarge sound system is finished, should reach. this standard as a system acceptable consult the standard is very important, its standard is listed in following watches: Sonic system of enlarge of classified character music integrates sound system of grade music enlarge 2 level languages and music hold the sonic system that use spread concurrently to unite level language and music to hold the sound system that use spread concurrently sound system of enlarge of 2 level language, allow 4 ～ of ＋ - 12dB and 8.0kHz of ～ of ≤ ± 4dB 0.063 allows to be 0dB with the average sound pressure level of 0.125 ～ 4.0kHz inside 0.1~6.3kH, allow ＋ 4 ～ - 12dB, and 6.3kHz of ～ of ≤ ± 4dB 0.1 allows to be 0dB with the average sound pressure level of 0.25 ～ 4.0kHz inside 0.125 ～ 4.0kHz, allow 4 ～ - 10dB, and ＋ allows inside 0.25 ～ 4.0kHz 4 ～ - 6dB 0.25 ～ 4.0kHz, with its average sound pressure level is 0dB, allow 4 ～ of ＋ - 10dB passes acoustical gain (the average ≥ of DB) 0.1 ～ 6.3kHz - 4dB (theatrics) ≥ - 8dB(music show) the average ≥ of 0.125 ～ 4.0kHz - the average ≥ of 8dB 0.25 ～ 4.0kHz - the average ≥ of 12dB 0.25 ～ 4.0kHz - 14dB sound field is inhomogenous spend (, 10dB of ≤ of 10dB 1.0/4.0kHz of ≤ of 8dB 1.0/4.0kHz of ≤ of 8dB 1.0/4.0kHz of 1.1/6.3 KHz ≤