The loudness of sounds is measured in decibels (dB). Learn the decibel levels for different sounds and know which noises can cause damage to your hearing. ... Decibels Explained. Decibel LevelSource 110 dBJackhammer, power saw, symphony orchestra 120 dBThunderclap, discotheque/boom box 110-125 dBStereo 110-140 dBRock concerts 4 more rows