Audio decoder for decoding a multi-object audio signal consisting of a downmix signal and side information, the side information comprising object-specific side information (PSI i) for at least one audio object (s i) in at least one time/frequency region (R(t R,f R)), and object-specific time/frequency resolution information (TFRI i) indicative of an object-specific time/frequency resolution (TFR h) of the object-specific side information for the at least one audio object (s i) in the at least one time/frequency region (R(t R,f R)), the audio decoder comprising: an object-specific time/frequency resolution determiner configured to determine the object-specific time/frequency resolution information (TFRI i) from the side information for the at least one audio object (s i); and an object separator configured to separate the at least one audio object (s i) from the downmix signal using the object-specific side information in accordance with the object-specific time/frequency resolution (TFRIi), wherein the object-specific side information is a fine structure object-specific side information ƒsl i n, k, ƒsl i n, k for the at least one audio object (s i) in the at least one time/frequency region (R(t R,f R)), and wherein the side information further comprises coarse object-specific side information for the at least one audio object (s i) in the at least one time/frequency region (R(t R,f R)), the coarse object-specific side information being constant within the at least one time/frequency region (R(t R,f R)), or wherein the object-specific side information is a fine structure object-specific side information ƒsl i n, k, ƒsl i n, k for the at least one audio object (s i) in the at least one time/frequency region (R(t R,f R)), and wherein the side information further comprises coarse object-specific side information for the at least one audio object (s i) in the at least one time/frequency region (R(t R,f R)), the coarse object-specific side information being constant within the at least one time/frequency region (R(t R,f R)), and wherein the fine structure object-specific side information ( ƒsl i n, k) describes a difference between the coarse object-specific side information and the at least one audio object (s i). an object-specific time/frequency resolution determiner configured to determine the object-specific time/frequency resolution information (TFRI i) from the side information for the at least one audio object (s i); and an object separator configured to separate the at least one audio object (s i) from the downmix signal using the object-specific side information in accordance with the object-specific time/frequency resolution (TFRIi), wherein the object-specific side information is a fine structure object-specific side information ƒsl i n, k, ƒsl i n, k for the at least one audio object (s i) in the at least one time/frequency region (R(t R,f R)), and wherein the side information further comprises coarse object-specific side information for the at least one audio object (s i) in the at least one time/frequency region (R(t R,f R)), the coarse object-specific side information being constant within the at least one time/frequency region (R(t R,f R)), or wherein the object-specific side information is a fine structure object-specific side information ƒsl i n, k, ƒsl i n, k for the at least one audio object (s i) in the at least one time/frequency region (R(t R,f R)), and wherein the side information further comprises coarse object-specific side information for the at least one audio object (s i) in the at least one time/frequency region (R(t R,f R)), the coarse object-specific side information being constant within the at least one time/frequency region (R(t R,f R)), and wherein the fine structure object-specific side information ( ƒsl i n, k) describes a difference between the coarse object-specific side information and the at least one audio object (s i).