An enclosure for a wearable acoustic monitoring device, the enclosure comprising: a hollow body portion defined by a sidewall and top wall; and a substantially planar base portion configured to interface with the hollow body portion thus forming a chamber therebetween, wherein, the base portion comprises a flat engagement surface, for engagement with a body surface, and an acoustic port through the flat engagement surface for acoustic communication from the body surface to an acoustic sensor housed within the chamber, and, wherein, the acoustic port is located within a depression in or elongate channel through the fiat engagement surface of the base portion such that the acoustic sensor is spaced apart from the body surface, in use.