We've released updates to the /media/enhance v1.0 API.

Changelog

api_version can now be viewed in GET responses for all services
Improved speech clarity and tone in both dry and reverberant acoustic environments. There is less high frequency roll off and less suppression of the reverb tail.
For talkers who were not close mic'd or speaking from a far distance from the microphone, voices are brought forward which allows noise reduction to be more effective while preserving natural speech.
Stationary background noise attributed to HVAC is quieter now for more content types.