If you have to rip in MP3 format then choose stereo at 192kb/s or higher.  Joint stereo is a way of sharing bits between the left & right channels.  Generally this allows for more detail to be encoded which makes lower bitrates sound better, but it can also cause phase distortion if the left & right channels are slightly out of phase, which sometimes occurs on old recordings, or done purposely for effect.

MP3 is historically bad for phase distortion.  There are much more modern and better codecs to rip your CD’s in these days.  Ogg Vorbis, AAC, etc.

Ross.