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Dipoles are characterised by their "polar response" which is the frequency response shown at different angles from a speaker. A polar response plot will show how a monopole speaker has omnidirectional bass, but where treble is aimed forwards. A dipole fires the sound out the front and back in a directional manner, with a null on the sides. There are two types of dipole speaker: * open baffle dipole where a driver is mounted on a baffle * box dipole where identical drivers are placed on opposte sides of a box with reversed polarity |