bruno putzeys wrote on Sun, 15 August 2010 14:29 |
As technical concepts near-field & far field are strictly defined in function of the ratio distance / wavelength. In the far field, several wavelengths away, acoustical (or in electromagnetic theory radiative) impedance is real and the inverse-square law works. In the near field the imaginary component becomes significant and the inverse square law no longer holds. The terms near and far field as applied to loudspeakers are not technical concepts but simply a description of application. With "near field" most people mean "sitting on the meter bridge". Far field are the mains and mid-field is a free-standing pair typical of a home hi-fi listening setup. |