How to lower bit and sample rate of web rtc to make the audio quality bad?

Question

Trying to lower the audio quality of web rtc to make a project a bit more realistic for what its emulating. I've tried similar things that I've seen posted with no luck. I think what im trying to do is decrease the allowed bit and sample rate.

I tried (gotten from: Is it really possible for webRTC to stream high quality audio without noise?) `

navigator.mediaDevices.getUserMedia({
  audio: {
    autoGainControl: false,
    channelCount: 2,
    echoCancellation: false,
    latency: 0,
    noiseSuppression: false,
    sampleRate: 8000,
    sampleSize: 16,
    volume: 1.0
  }

` but it doesn't seem to make the audio sound bad. The goal is to get it to sound more like AMBE audio.