Encoder Settings Below 24kbps

[triple_nickel]

I've searched the forums without success concerning this issue.

We broadcast spoken word (no music) using ShoutCast.

Everything works fine with our current configuration however we could broadcast our stream at a bitrate that is at below the lowest available default setting without a substantial difference to our listeners.

In theory, doing that should allow us to add more simultaneous users and/or will reduce our monthly bandwidth usage.

My old "Total Recorder" program would allow us drop recording settings down to as low as 8khz, 8bit, mono. I don't know that we want to go quite that low, but is there a solution to add lower bitrate settings or a different encoder to Shoutcast?

Thanks in advance for the assistance.