But with Shoutcast and Icecast servers you have an 'Administrator' password and a 'Source' password. The 'Administrator' password is for logging into the control panel and admin areas of your server. The 'Source' password is for your DJ's to use purely to broadcast to the server.
You can change the 'Administrator' / 'Source' passwords from the 'Configuration' > 'Settings' > 'Stream' area of your control panel. With Shoutcastv2 servers the 'Administrator' / 'Source' passwords cannot be the same!