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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.
Crackles Heard on End-Inspiration. These sounds are commonly, and INACCURATELY referred to by many as rales . End-inspiratory crackles are generally sharp and high-pitched, as they are occurring in the very small airways (bronchioles or terminal bronchioles) and/or in the air sacs (alveoli).