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I guess the best way to prove it would be to quiet the network as totally as possible (after hours, when no large processes are running), and measure the amount of bandwidth a "quiet" network uses. Then set up streaming audio on one PC. See how much bandwidth above the "quiet" bandwidth is being taken up. Add another streaming PC to the mix with video, noting the same. You might add one more, but you should be able to map the trend from that.
If you don't have a way to measure the bandwidth at any time, talk to your access provider . They may be able to provide the stats for you.