Repetition Training - Basic Lung Sounds Crackles - Coarse (Rales) Lesson Waveform Anatomy play pause Table of Contents 1Crackles - Fine (Rales) 2Crackles - Coarse (Rales) 3Wheeze 4Rhonchi - Low Pitched Wheezes 5Bronchial 6Pleural Rubs Quiz This video is an animation of Crackles - Coarse (Rales) A#421 (lesson# 2) within course number 2. Coarse crackles are discontinuous, brief, popping lung sounds. Compared to fine crackles they are louder, lower in pitch and last longer. They have also been described as a bubbling sound. You can simulate this sound by rolling strands of hair between your fingers near your ear.