MP3 streams are 128kbps 
HLS streams are 50kbps and 100kbps

In either case the HLS stream doesn't need as much capacity as the MP3. 
This may be the source of the problem.  HLS can dynamically drop down to
slower speed if there is not enough bandwidth.

On Boom you're using the Shoutcast 128kbps MP3 stream which will go
straight from BBC server to Boom.  Increasing the buffered Radio second
is the only tweak available.

I don't know the specs of the Kogan radio. I'm guessing the Kogan radio
is based on a Frontier Siliocn chipset since you are using Frontier
Silicon Portal and other radios with Frontier Silicon Venice 6.5 chips
play BBC HLS streams so I think the Portal supplies URL for the HLS. 

If the Kogan radio tells you the audio format of the stream is AAC -
then you are playing HLS.  WOuld be good if you can check if your are
playing a 50kbps stream or the 100kbps.

AAC is a better audio format. A 96kbps AAC stream is supposed to sound
as good as a 128kbps MP3.


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