I thought the same thing till heard the sound from this review
http://community.cruisercustomizing.com/_Kuryakyn-Cranker-Bag-by-Sportech-KY-4161/blog/439664/22960.html?b=I do very much aprec your input though, points well taken.
I have been doing fine without music now on the Valk
I doubt I could do it on the Goldwing.
Reason I wanted the Tank Bag is, it seems less permanent. ( easy on off) No speakers bolted to handle bars.