U could try to buy a small bluetooth speaker (tons around) and fabricate a holder for it or toss it inca cup holder.

i have a speaker that is round that fits right into a cup holder.

 

Ear buds look like a simple solution. I know different municipalities have rules about “earphone while driving” but for safety, one side will do. It will also preserve the stripped look of the Dyna.
Looks like posters in the audio section are talking about fairing mounted systems, I’d mount speakers behind sport shield on the handlebars

 

Situational awareness can be degraded to the same degree with either. An external system turned up loud enough to be clearly audible at speed would have to be at least, what?, 100+ decibels?

Most car exhausts are well under 90db...let alone their tire or engine noise.

100 decibels with ear buds would be crazy, IMO. Good in ear monitors have excellent isolation, reducing noise from wind, exhaust, etc, and allows you to enjoy music at much lower volumes.

I don't have any studies on the subject but I have a 1500 watt stereo in my convertible and I know with my IEMs in and playing at comfortably audible levelson the bike (enough to break the monotony on long trips) I can still hear surrounding vehicles on the highway. I'd estimate it being comparable, bike and car... I can EASILY drown out all surrounding noises with either.

After a couple hours in the convertible my ears are ringing and I have a headache. I don't get that on the bike. I truly think my noise exposure on the bike with ear buds is considerably lower.

Often times on the bike I just have the GPS running so I effectively just have ear plugs in. Tho I still get clearly audible nav prompts without ever taking my eyes off my surroundings.

Different strokes, obviously, but I can't say head-fi is inherently more dangerous than any other entertainment system.

Just MHO.

 

 

Bolt whatever you like to your bike.

But, for the sake of the rest of the world who will be exposed your specific taste in music, perhaps in-helmet audio is the way to go.

Jus' sayin' ....

 

 

recently a buddy i ride with here in Hill country bought a 3 pack of those sens 20s units and installed them in mine and another guys helmet when we were at work, he then asked for our phones and linked the headset to the phones... he said that we could not only communicate when we rode the three twisted sisters ride, but also listen to music thru it when we were riding solo.

I thanked him and told him I didnt have unlimited data on my phone and rather enjoyed the sound of my Glide. (they both ride jap bikes).

i rode home that evening with it in my helmet with it off, the speakers in the ear pockets made the foam touch my ears and was uncomfortable.
when i got home I removed it from my helmet and returned it to him the next day.

everyone is different, I prefer the sounds of the bike and the road.