Loudspeaker radiation
Loudspeaker which radiates in a given space (defined by its solid angle) exposed to an acoustic impedance, called a radiation impedance, which comprises at low frequencies (ka <1, where k is the wave number and a is the radius of loud speaker) :
Radiation resistance. Radiation resistance depends on the far field radiation conditions (solid angle in which sound power is delivered). For a solid angle of
steradians (spherical radiation), radiation resistance is proportional to
. For a solid angle of
(half space), radiation resistance is doubled and it is proportional to
Radiation mass. Radiation mass depends on the geometry of the discontinuity between the loudspeaker and surrounding environment.
