Methods of loudspeaker response equalization using digital filters are comp
ared. In addition to generally known methods and techniques a recently intr
oduced new principle, based on warped filters, is described. Different equa
lization methods are compared from the points of view of equalization error
both objectively and subjectively, computational efficiency, as well as ro
bustness and precision requirements of each method. The study is limited to
the linear (magnitude and phase) equalization of loudspeaker free-field re
sponses.