Welcome to the group all of us are hooked on motorcycles.
I'm playing an mp3 player on my 98 Tourer. Played it through headphone speakers for years. I have spliced into the CB system which gives me a thumb lever for volume control.
Last year wanting a change I added handle bar speakers and a 500 watt amp. They sound pretty good. I put the amp and mp3 player in the nose of the right saddlebag. I still use the same volume control which is needed when you slow down or stop the volume is way to loud.
Here is the CB and one speaker,
.jpg)
and a picture of the amp in the saddlebag
.jpg)