The table below can help you estimate the kind of mp3 quality/compression and bit rates to use for your own applications. We also give you approximate file sizes to help you compare. For most in-class audio lectures 32 kbps will work. For supplemental recordings that are shorter in length, 64kbps-96kbps will offer better audio quality.
If the wav file was sampled at 16 bits/44.1kHz, you've got CD quality sound
Very low compression, superior sound quality
The standard "CD quality" bit rate
Considered "near CD quality"
Slightly lower than FM radio station
Lower quality audio, low file size. Good for recording long lectures and keeping file size small