Abstract: A stethoscope for auscultating sounds from a subject, the stethoscope including a housing, a curvilinear convex diaphragm supported on the housing for interfacing with the site being auscultated and for receiving sounds therefrom, an enclosed acoustic chamber supporting on the housing and communicating with the curvilinear convex diaphragm for enhancing the fidelity of the received sounds, and means for transmitting the enhanced received sounds to the user, which can be a dual lumen wave guide to binaurals or a single lumen wave guide to one aural tube. With such an arrangement, the user is capable of taking vital signs through clothing, bandages, blankets are other obstructions, even in the presence of high ambient noise, and can auscultate low frequency sounds associated with heart sounds and bowel sounds with significantly improved clarity and volume.