Dynamic Speakers

Radio Record, Volume II, Issue 45, 24 May 1929, Page 35

Dynamic Speakers

THH terms "dynamic speaker," "moving coil," and so on are used rather indiscriminately in this count and evidently also in the United States, for I notice, states a writer to "Modern Wireless," that the U.S. Radio Manufacturers’ Association has now adopted a definition of the term "dynamic speaker" as follows: "A dynamic speaker is one in which @ portion of the conductor carrying the alternating signal current is a part of the moving system, the force producing the motion being due to the location of this conductor in a magnetic field." The U.S. R.M.A. THIS definition was adopted by the Radio Manufacturers’ Association at a meeting held in Chicago at the end of the year. It will be seen from the definition that it includes what we ° call a "moving coil" speaker, as well as one in whicl an ‘ron iature is used having a winding around the armature which carries the speech current or some portion of it, It is just as Well that this definition should have been adopted, although it seems that the term "dynamic speaker" should really cover any type of speaker in Which, for instance, a diaphro: 1 or an n armature was used.