Hydrogenaudio Forums - encoding the spoken word - settings?. Got a bunch of spoken word, here's how to encode really small with Lame. You only need mono and a low bit rate.
Some recommendations are to use a very low bit rate (-V 7) and also to use mono (-a)
lame -V 7 -a
Another option is the --voice option which gives you mono, 24KHz sample rate, 12 Khz lowpass filter and nets a 56kpbs bit rate.
Another option gives you a 48kbps and a 8KHz lowpass filter:
lame -V3 --vbr-new --lowpass 8
