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Bandwidth

96 kb/s: about 107 kb/s on the wire, roughly 48 MB an hour or about 1,150 MB a day.

160 kb/s: about 175 kb/s on the wire, roughly 80 MB an hour or 2 GB a day.

160 kb/s is the same AAC track as the video, passed through unchanged. 96 kb/s is that track re-encoded: about 24× less data than watching, and the difference on a phone speaker or earbuds is small. The audio runs a few seconds behind the picture. Watch with video.