Make sure that your playback device also supports an audio codec over and above the SBC codec implemented as standard.
Aventho wireless supports the Qualcomm® aptX™ HD, Qualcomm® aptX™ and AAC codecs.
The particular codecs your playback device supports can be found in the data sheet for the respective playback device, with high-quality Android devices typically supporting Qualcomm® aptX™ and Apple devices, on the other hand, AAC. (All support SBC.)
The playback device and Aventho wireless always communicate automatically based on the highest-quality codec available.
Moreover, we recommend always leaving the volume on the playback device set to the highest level and simply adjusting the actual playback volume on the headset.