I made my own boombox. You can look up the post I did looking for feed back on it. Just do a search for - PSU.
I’ve used this for the past 10 years.
I use it in the following places:
In bathroom when I shower, in the kitchen, in the garage, out on the deck, in the back yard, on vacation, in the camper. Let’s just say it gets around. It also makes paying for an iphone and a cell phone plan much more justifiable.
Here’s a link to my Dropbox with some pics and videos as well.