AES New York 2013
Saturday, October 19, 11:15 am — 12:45 pm (Room 1E14)
T13 - A Holistic Approach to Crossover Systems and Equalization for Loudspeakers (A Master Class Event)Presenter:
Malcolm O. J. Hawksford, University of Essex - Colchester, Essex, UK
Loudspeaker systems employ crossover filters and equalization to optimize their performance in the presence of electroacoustic transducers limitations and associated loudspeaker enclosures. This Master Class will discuss both analog and digital techniques and include examples of constant-voltage, all-pass, and constant-delay crossover alignments together with the constraints imposed by the choice of signal processing. The meaning of “minimum-phase” will be described including its linkage to causality and digital equalization strategies presented that emphasize the importance of loudspeaker impulse response decomposition into minimum-phase and excess-phase transfer functions. The session will include demonstrations on minimum-phase response derivation from a magnitude-frequency response and on the audibility of pure phase distortion to justify the use of the Linkwitz-Riley 4th-order class of analog crossover alignment.