1. If the average sound insulation volume of the objective quantity is less than 30 decibels, but the normal conversation next door can be heard very clearly, and it is easy to understand the content of the conversation, then the sound insulation effect is very poor.
2. If you can hear loudly at 30~35 decibels, you can hear it in normal conversation, but it is not easy to understand, then the sound insulation effect is very poor.
3. At 35~40 decibels, loud conversations can be heard, but it is not very clear, and normal conversations are also very weak when heard, and the sound insulation effect is obviously average.
4. In the case of 40~45 decibels, loud conversations can be heard, but you can't understand the whole meaning, and you can't hear normal conversations, and the sound insulation effect is better.
5. If you can't hear a loud conversation at 45~50 decibels, and you can only hear the loudest sound of shouting loudly and turning on the radio, then the sound insulation effect is good. It is possible to score a 60 points.
6. You can't hear the loud shouting at 50~55 decibels, and you can't hear the loudest sound when the radio is turned on, so the sound insulation effect is excellent.
