The performance testing of sound-absorbing wedges is an important step in ensuring that their sound absorption effect meets the design requirements. The following is the testing method for sound absorption performance based on search results:
 
1. Sound absorption coefficient test
 
The sound absorption coefficient refers to the proportion of sound energy absorbed by sound-absorbing materials to the incident sound energy, and it is an important indicator for evaluating the performance of sound-absorbing materials. The testing of sound absorption coefficient is usually conducted in specialized anechoic or reverberation chambers. During testing, the sound-absorbing cone will be placed in the testing room, and then sound waves of a certain frequency and intensity will be emitted from the sound source. The sound pressure level after passing through the sound-absorbing cone will be measured to calculate the sound absorption coefficient.
 
2. Cut off frequency test
 
The cut-off frequency refers to the lowest frequency that the sound absorbing cone can effectively absorb. The cut-off frequency test is usually conducted in a dedicated anechoic or reverberation room. During testing, the sound-absorbing cone will be placed in the testing room, and different frequencies of sound waves will be emitted through a sound source to measure the absorption effect of the sound-absorbing cone on different frequencies of sound waves, in order to determine its cutoff frequency.
 
3. Sound pressure level change test
 
In an anechoic chamber, when the distance r doubles, the sound intensity level decreases by 6dB. When the distance is far enough, the spherical wave appears approximately as a plane wave. Therefore, we usually detect anechoic chambers based on the characteristics of sound pressure level changes in this free sound field. By doubling the distance, the sound pressure level decreases by 6dB, with an allowable deviation range of approximately ± 0.5dB.
 
The above is the basic method for testing the performance of sound absorption spikes. It should be noted that due to the complex acoustic principles and techniques involved in the performance testing of sound absorbing wedges, professional technicians are required to operate during the actual testing process.