First, it's better to continue on started thread, but well...
Second, to repeat, you can't to LIVE streaming with dreamhost, but you can do streaming like youtube (with only audio for you).
Then, considering 128kbps stream, it takes about 1MB/minute.
So, with 1500GB/month, you can provide 1 500 000 minutes of stream per month for ALL your listeners.
If they listen to your stream average 60min/month for instance,
you can have 1 500 000/60 = 25 000 listeners.
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