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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 that partially clear or change after coughing may indicate bronchiectasis. 1  Crackles are often described as fine, medium, and coarse. 2  Fine crackles are soft, high-pitched, and very brief. 3  Coarse crackles are somewhat louder, lower in pitch, and last longer than fine crackles.