is download speed 1200 or so and upload around 230 enough to stream ? ping is around 120 or so to 200
Yes.
Scanner audio is usually encoded at a bitrate of around 16kbps or 24kbps. If you host your own audio server, around 8 people (if you use a bitrate of 24kbps) to 13 people (if you use a bitrate of 16kbps) would be able to listen to your scanner at once.
You can figure out how many people would be able to listen at once by taking your upstream bandwidth (230) and dividing that by the bitrate you choose (16 or 24). You'll want to subtract one or two from that number to account for variances in your upstream bandwidth.
If you use someone else to host your audio (my site or some other hosting company) then only 16kbps/24kbps of your upstream bandwidth is used no matter how many people are listening since the listeners are connecting to someone else's server.
-- Gordon