An importance metric based at least in part on the energy metric may be determined for each of the plurality of received audio objects. Some methods include: determining a global significance metric for all of the audio objects based at least in part on the total energy value computed by summing the energy metrics of each of the audio objects; Determining an estimated quantization bit depth and a quantization error for each of the audio objects; Calculating a total noise metric for all of the audio objects, the total noise metric being based at least in part on a total quantization error corresponding to the estimated quantization bit depth; Calculating a total signal-to-noise ratio corresponding to the total noise metric and the total energy value; And determining a final quantization bit depth for each of the audio objects by applying a signal-to-noise ratio threshold to a total signal-to-noise ratio.
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