A Diffractive Study on the Relation between Finite Baffle and Loudspeaker Measurement

A method of calculating the diffraction by a finite baffle in loudspeaker measurement is proposed based on the extended Biot-Tolstoy-Medwin (BTM) technique. Diffractive effects of the IEC standard baffle on frequency response measurement of a loudspeaker unit are quantitatively described and analyzed in detail. A correction process is proposed to compensate the frequency response measured on a finite baffle to the result on an ideal infinite baffle. Experiments are undertaken and show validity. Investigations are carried out into the relation between measuring baffle and loudspeaker, and designing appropriate and practical baffle specifications according to actual requirements of the driver is discussed.