Nicholas Briggs by fellow "Doctor Who" actor Noel Clarke. Briggs became the presenter of Radio 7's Seventh Dimension, daily science fiction segment in 2011. As of 15 April 2013, he is part of a rotating line-up of hosts of the 7th Dimension on BBC Radio 4 Extra. Nicholas Briggs Nicholas Briggs (born September 29, 1961) is an English actor, writer, director, sound designer, composer and voice actor predominantly associated with the BBC science fiction television series "Doctor Who" and its various spin-offs, particularly as the voice of the Daleks and the Cybermen. He is also the executive producer of Big Finish Productions,
Voice coil principal power limitation on such coils is the thermal softening point of the adhesives which bond the wire to the bobbin, or the bobbin to the spider and coil. Voice coils can be used for applications other than loudspeakers, where time force linearity and long strokes are needed. Some environments like vacuum or space require specific attention during conception, in order to evacuate coil losses. Several specific methods can be used to facilitate thermal drain. The image above shows two ways in which the voice coil is immersed in the magnetic field. The most common method is the "overhung" design