maybe a car with a side view rather than something that looks like a sofa with square speakers in the font 
I guess there might be some that have some means to listen in their cars - even if its in the vicinity of the house via wifi. If I had a stonkin’ sound system in my car I would be be doing that…if it was better than my home setup or wanted some privacy.
and a raspberry pi looking logo maybe for those running them with non recognised hats or dacs