Default Audio Bitrate and Global Bitrate Config

What’s the default bitrate for audio output, i.e. if I output to icecast via MP3:

output = tee name=t ! queue ! audioresample ! autoaudiosink t. ! queue ! lamemp3enc ! shout2send async=false mount=mopidy ip= port=8000 password=hackme

What is the bitrate of the stream?

Also to avoid me having to put a bitrate entry for every source such as Spotify, Gmusic, etc; is it possible to set a global bitrate setting in the config file?