When listening to music in the latest versions of Style Jukebox, you can see in the Now Playing / Player section a info bar with the Audio Quality tier of the song that is currently playing.
Depending on the song's audio quality or the adjusted audio quality in Settings, you can have:
LOW - equal or less than 96kbps
NORMAL - between 96kbps and 256kbps
HIGH - between 256kbps - 320kbps
HI-FI (High-Fidelity / CD Qualty) - up to 16bit / 1411kbps
HI-RES - 24bit depth, high bitrate and sample rate