A method for processing audio information that includes object data, wherein the method comprises: receiving one or more signals that convey the object data representing aural content and spatial metadata for each of one or more audio objects, wherein the spatial metadata contains data representing a location in space relative to a reference position in a playback system; processing the object data and configuration information to calculate rendering matrix coefficients forming a new rendering matrix (M new), wherein the configuration information describes a configuration of acoustic transducers in a set of acoustic transducers for the playback system; in response to the aural content of the audio objects, calculating a measure of update performance from the calculated rendering matrix coefficients and current rendering matrix coefficients forming a current rendering matrix (M curr) currently used for rendering signals in the playback system, wherein the measure of update performance is calculated according to psychoacoustic principles, and deriving matrix update parameters from the measure of update performance; generating updated matrix coefficient values in response to the rendering matrix coefficients and the matrix update parameters; updating the current rendering matrix coefficients to form a modified rendering matrix (M mod) in response to the updated matrix coefficient values; and either assembling an encoded representation of the object data and the rendering matrix coefficients of the modified rendering matrix (M mod) into an encoded output signal, or applying the modified rendering matrix (M mod) to the object data representing the aural content of audio objects to generate audio output signals representing the aural content of rendered audio objects for respective audio channels. receiving one or more signals that convey the object data representing aural content and spatial metadata for each of one or more audio objects, wherein the spatial metadata contains data representing a location in space relative to a reference position in a playback system; processing the object data and configuration information to calculate rendering matrix coefficients forming a new rendering matrix (M new), wherein the configuration information describes a configuration of acoustic transducers in a set of acoustic transducers for the playback system; in response to the aural content of the audio objects, calculating a measure of update performance from the calculated rendering matrix coefficients and current rendering matrix coefficients forming a current rendering matrix (M curr) currently used for rendering signals in the playback system, wherein the measure of update performance is calculated according to psychoacoustic principles, and deriving matrix update parameters from the measure of update performance; generating updated matrix coefficient values in response to the rendering matrix coefficients and the matrix update parameters; updating the current rendering matrix coefficients to form a modified rendering matrix (M mod) in response to the updated matrix coefficient values; and either assembling an encoded representation of the object data and the rendering matrix coefficients of the modified rendering matrix (M mod) into an encoded output signal, or applying the modified rendering matrix (M mod) to the object data representing the aural content of audio objects to generate audio output signals representing the aural content of rendered audio objects for respective audio channels.