Hey @bperk49! There should definitely not be any crackling noise in your two way audio. Audio disturbances are often related to connection or signal strength, whether wifi related or mobile device related. Check out our Community post about RSSI to ensure your wifi signal strength is sufficient for optimal streaming.
A great way to test mobile phone connection is to try a live stream with audio on wifi only, and then again on data only. Of course, you may also try uninstalling and reinstalling the app on your mobile device to see if that improves the audio. Let me know if this works!