In one example, a method includes obtaining a representation of a multi-channel audio signal for a source loudspeaker configuration; obtaining a representation of a plurality of spatial positioning vectors (SPVs), in a Higher-Order Ambisonics (HOA) domain, that are based on a source rendering matrix, which is based on the loudspeaker configuration; and generating a HOA soundfield based on the multi-channel audio signal and the plurality of spatial positioning vectors.