The present invention relates to a protective shell (1) for ordiphone, comprising a bottom (2) intended to cover at least partially the rear face of a ordiphone, a lateral wall (3) along at least part of the bottom (2) and defining with the bottom (2) a receiving space (4) of the ordiphone, the receiving space (4) is shaped to match the shapes of the ordiphone, characterized in that the bottom (2) of the protective shell (1) has a bulge (5) intended to be positioned facing a high - loudspeaker of ordiphone, the swelling (5) ending in a branch channel (6) formed in the lateral wall (3).
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