Abstract: A speaker having a core casing for enclosing a magnetic casing and a housing which form one integral piece. The integral piece accurately retains a magnetic plate and a magnetic core relative to the housing. An annular cavity is formed between the magnetic plate and the magnetic core for receiving a voice coil bobbin and cone assembly and allows the assembly to vibrate freely. The housing comprises an annular front face which has a terminal plate mounted on an outer edge thereof. A detachable terminal plate fits on the terminal plate mount core casing.