A hearing aid having an inlet system for two or more microphones in the hearing aid, the inlet system comprising an inlet member with a main body portion having a first portion and a second portion, the second portion being provided with a first recess formed for accommodating a first microphone, the first microphone comprising a microphone body and a sound inlet or snout for conducting sound energy into the interior of the first microphone, wherein the first recess is provided with a first sound channel formed for engagement with the sound inlet or snout of the first microphone, where the first sound channel at the longitudinal end hereof facing away from the first microphone is acoustically coupled to a first cavity, from which first cavity there extends at least one third sound channel that provides acoustic communication between the first cavity and one or more outer surface portion(s) of the hearing aid, wherein said second portion of said inlet member is provided with a second recess formed for accommodating a second microphone, the second microphone comprising a microphone body and sound inlet or snout for conducting sound energy into the interior of the second microphone, wherein the second recess is provided with a second sound channel formed for engagement with the sound inlet or snout of the second microphone, where the second sound channel at the longitudinal end hereof facing away from the second microphone is acoustically coupled to a second cavity, from which second cavity there extends at least one fourth sound channel that provides acoustic communication between the second cavity and one or more outer surface portion(s) of the hearing aid, wherein said first sound channel extends a distance into said first cavity such that a shoulder portion is formed between the entrance of the first sound channel and the adjacent wall portions of the first cavity, whereby the passage of contaminants from the first cavity via the first sound channel to the interior of the microphone that is coupled to the first sound channel will be prevented or reduced. an inlet member with a main body portion having a first portion and a second portion, the second portion being provided with a first recess formed for accommodating a first microphone, the first microphone comprising a microphone body and a sound inlet or snout for conducting sound energy into the interior of the first microphone, wherein the first recess is provided with a first sound channel formed for engagement with the sound inlet or snout of the first microphone, where the first sound channel at the longitudinal end hereof facing away from the first microphone is acoustically coupled to a first cavity, from which first cavity there extends at least one third sound channel that provides acoustic communication between the first cavity and one or more outer surface portion(s) of the hearing aid, wherein said second portion of said inlet member is provided with a second recess formed for accommodating a second microphone, the second microphone comprising a microphone body and sound inlet or snout for conducting sound energy into the interior of the second microphone, wherein the second recess is provided with a second sound channel formed for engagement with the sound inlet or snout of the second microphone, where the second sound channel at the longitudinal end hereof facing away from the second microphone is acoustically coupled to a second cavity, from which second cavity there extends at least one fourth sound channel that provides acoustic communication between the second cavity and one or more outer surface portion(s) of the hearing aid, wherein said first sound channel extends a distance into said first cavity such that a shoulder portion is formed between the entrance of the first sound channel and the adjacent wall portions of the first cavity, whereby the passage of contaminants from the first cavity via the first sound channel to the interior of the microphone that is coupled to the first sound channel will be prevented or reduced.