An apparatus for driving loudspeakers of a sound system, the sound system comprising at least two loudspeakers (131, 132; 131, 132, 135; 131, 132, 133, 134) of a basic system, and at least three loudspeakers (141, 142, 143) of a focus system, wherein each of the loudspeakers of the basic system and of the focus system has a position in an environment, and wherein the apparatus comprises: a basic channel provider for providing basic system audio channels to drive the loudspeakers (131, 132; 131, 132, 135; 131, 132, 133, 134) of the basic system, a focused source renderer for providing focus system audio channels to drive the loudspeakers (141, 142, 143) of the focus system, wherein the focused source renderer is configured to calculate a plurality of delay values (δ 11, δ 12, δ 13) for the loudspeakers (141, 142, 143) of the focus system based on the positions of the loudspeakers (141, 142, 143) of the focus system and based on a position of a focus point, wherein the focused source renderer is configured to generate at least three focus group audio channels for at least some of the loudspeakers (141, 142, 143) of the focus system based on the plurality of delay values (δ 11, δ 12, δ 13) and based on a focus audio base signal to provide the focus system audio channels, wherein the basic channel provider is configured to generate the basic system audio channels based on the focus audio base signal and based on panning information for blending the focus audio base signal between the basic system and the focus system, and wherein the focused source renderer is configured to generate the at least three focus group audio channels based on the focus audio base signal and based on the panning information for blending the focus audio base signal between the basic system and the focus system. a basic channel provider for providing basic system audio channels to drive the loudspeakers (131, 132; 131, 132, 135; 131, 132, 133, 134) of the basic system, a focused source renderer for providing focus system audio channels to drive the loudspeakers (141, 142, 143) of the focus system, wherein the focused source renderer is configured to calculate a plurality of delay values (δ 11, δ 12, δ 13) for the loudspeakers (141, 142, 143) of the focus system based on the positions of the loudspeakers (141, 142, 143) of the focus system and based on a position of a focus point, wherein the focused source renderer is configured to generate at least three focus group audio channels for at least some of the loudspeakers (141, 142, 143) of the focus system based on the plurality of delay values (δ 11, δ 12, δ 13) and based on a focus audio base signal to provide the focus system audio channels, wherein the basic channel provider is configured to generate the basic system audio channels based on the focus audio base signal and based on panning information for blending the focus audio base signal between the basic system and the focus system, and wherein the focused source renderer is configured to generate the at least three focus group audio channels based on the focus audio base signal and based on the panning information for blending the focus audio base signal between the basic system and the focus system.