Apparatus for calculating driving coefficients for loudspeakers of a loudspeaker arrangement for an audio signal associated with a virtual source, the apparatus comprising: a multi-channel renderer configured to calculate first subdriving coefficients for loudspeakers of the loudspeaker arrangement according to a first calculation rule, configured to calculate second subdriving coefficients for the same loudspeakers according to a second calculation rule and configured to calculate driving coefficients for the same loudspeakers based on the first subdriving coefficients and the second subdriving coefficients, if a position of the virtual source is located within an inner area of a loudspeaker transition zone, wherein the multi-channel renderer is configured to calculate second subdriving coefficients for loudspeakers of the loudspeaker arrangement according to the second calculation rule, configured to calculate third subdriving coefficients for the same loudspeakers according to a third calculation rule and configured to calculate driving coefficients for the same loudspeakers based on the second subdriving coefficients and the third subdriving coefficients, if a position of the virtual source is located within an outer area of the loudspeaker transition zone, wherein the second calculation rule is different from the first calculation rule and the third calculation rule, wherein the second calculation rule comprises an amplitude panning algorithm, wherein the transition zone separates an inner zone of the loudspeaker arrangement and an outer zone of the loudspeaker arrangement, wherein the loudspeakers of the loudspeaker arrangement are located within the transition zone, wherein a border of the loudspeaker transition zone comprises a minimal distance to a loudspeaker of the loudspeaker arrangement depending on a distance between the loudspeaker and a loudspeaker adjacent to this loudspeaker, wherein the loudspeaker arrangement comprises at least two pairs of adjacent loudspeakers with different distances between the loudspeakers of the respective pair of loudspeakers. a multi-channel renderer configured to calculate first subdriving coefficients for loudspeakers of the loudspeaker arrangement according to a first calculation rule, configured to calculate second subdriving coefficients for the same loudspeakers according to a second calculation rule and configured to calculate driving coefficients for the same loudspeakers based on the first subdriving coefficients and the second subdriving coefficients, if a position of the virtual source is located within an inner area of a loudspeaker transition zone, wherein the multi-channel renderer is configured to calculate second subdriving coefficients for loudspeakers of the loudspeaker arrangement according to the second calculation rule, configured to calculate third subdriving coefficients for the same loudspeakers according to a third calculation rule and configured to calculate driving coefficients for the same loudspeakers based on the second subdriving coefficients and the third subdriving coefficients, if a position of the virtual source is located within an outer area of the loudspeaker transition zone, wherein the second calculation rule is different from the first calculation rule and the third calculation rule, wherein the second calculation rule comprises an amplitude panning algorithm, wherein the transition zone separates an inner zone of the loudspeaker arrangement and an outer zone of the loudspeaker arrangement, wherein the loudspeakers of the loudspeaker arrangement are located within the transition zone, wherein a border of the loudspeaker transition zone comprises a minimal distance to a loudspeaker of the loudspeaker arrangement depending on a distance between the loudspeaker and a loudspeaker adjacent to this loudspeaker, wherein the loudspeaker arrangement comprises at least two pairs of adjacent loudspeakers with different distances between the loudspeakers of the respective pair of loudspeakers.