Earpiece

An earpiece comprising a hollow cylindrical earpiece body, said hollow cylindrical earpiece having an open chamber axially extended through two distal ends thereof, and an end cap fastened to one end of said hollow cylindrical earpiece.

An earpiece comprising a hollow cylindrical earpiece body and an open chamber defined in said hollow cylindrical earpiece body, said hollow cylindrical body a first end opened, a second end closed, an outside annular groove disposed around the periphery thereof near the close end, and a thin wall portion surrounded by said outside annular groove.

An earpiece comprising a tapered earpiece body, said tapered earpiece body having a first end and a second end, a plurality of axial holes axially disposed in said tapered earpiece body and extended through the first end of said tapered earpiece body, and a diaphragm disposed at the second end of said tapered earpiece body.

An earpiece comprising a hollow cylindrical earpiece body, two diaphragms respectively disposed at two distal ends of said hollow cylindrical earpiece body, an enclosed chamber defined in said hollow body between said diaphragms, and flexible conical skirts extended around the periphery of said hollow cylindrical earpiece body and axially spaced from one another.