It’s a real pain to change the bitrate of Sound Juicer to actually make the MP3 or Ogg files good quality. For some reason the default quality is terrible and the developers have removed the menu which allows you to change the bitrate. Frankly, this makes Sound Juicer useless as a ripping tool and I believe that it should be removed from the Ubuntu repositories.
Basically, my advice is to uninstall Sound Juicer and install Asunder.
sudo apt-get remove sound-juicer
sudo apt-get install asunder
This will save you a world of pain and give you an easy to use piece of software.