3.3 Electro-acoustic Performance Indexes
3.3.1 The electro-acoustic performance indexes of PAS in every service zone shall be in accordance with those specified in Table 3.3.1.
Table 3.3.1 Electro-acoustic performance indexes of PAS
*:The ENSPL of emergency broadcast shall meet the requirements stipulated in item 2，article 3.2.5 of this code.
Figure 3.3.1-1 Tolerance domain of indoor transmission frequency response of business announcement class 1/background broadcast class 1
（the maximum value of the measured curve is set to be 0dB）
Figure 3.3.1-2 Tolerance domain of indoor transmission frequency response of business announcement class 2/background broadcast class 2
（the maximum value of the measured curve is set to be 0dB）
Figure 3.3.1-3 Tolerance domain of indoor transmission frequency response of business announcement class 3
（the maximum value of the measured curve is set to be 0dB）
3.3.2 For indoor PAS，the relevant architectural acoustic characteristics should comply with the requirements of current national standards GB/T 50356，Code for architectural acoustical design of theater，cinema，and multi-use auditorium and JGJ/T 131，Specification for acoustical design and measurement of gymnasium and stadium.