Just thought I'd loop back to this subject as yeterday I made some interesting discoveries.
Up until yesterday, I'd tried a few different audio options...
1) Bluetooth - its terrible
2) Music on a USB stick - its not great
Now #1 I expected, #2 was how I ran my Mk7/7.5's and it was fine with the caveat that your audio files need to be suitably good enough.... only I've been dissapointed - even after I sought lossless FLAC files of my favourity tunes.
Yesterday on my road trip I thought I'd try messing with Alexa again. It actually worked for once, which in itself is a minor miracle but...
The music via Amazon is loud, its got base it totally blasted me, I couldn't turn it up to max, it was totally shaking me! Brilliant!
THAT was what I was expecting HK to do (no distortions either), but I don't really understand why.
It has to be the audio codec on the MIB unit.... I can only assume the Alexa app has its own.
Anyway, tip for anyone wanting to shake plaster off of the walls of houses you drive past.... use Alexa (if you can make it work!)