Unfortunately, we could not get any information other than the following:
2x 9W (L&R) and 1x18W (Bass), giving a maximum of 36W.
The power consumption will vary depending on many factors, including mode, volume setting, screen lighting, network connection and audio content. However, if you are listening to a DAB voice radio station with the volume set at 50%, the power consumption is approximately 4.32W.