Which of those alternatives is powered by the intercom, known to be free of EMI issues, etc? I'd love to see an enhanced Dynon intercom that has truly integrated Bluetooth, and while we are at it, support for more seats! We love the function of the PM3000, allowing the back seaters to be on their own interphone and aux audio when desired.
In my Rocket, I have Bluetooth (cell & music) and a Garmin Aera which plays my library of MP3s. I also have a stereo audio jack. As the PIC, however, I only get to listen to tunes on long trips over sparsely populated terrain, when there is no radio traffic. I think I am over-invested in this capability already, but I love the cell interface when I am wearing my helmet and need to call flight services.
I also developed a family of audio devices for per-seat use that allows the insertion of music/cell capability. Turns out that the killer app for these ASX-2B devices were tour operators that would issue multi-language tape players for tourists on flights. With install costs considered, I think the modern solution would be to purchase bluetooth capable headsets and use smartphones for this.
So there are many ways to get tunes, but the trend is to provide this capability in headsets. Bose or Lightspeed come to mind... and you get ANR and higher quality audio. Give your PAX an iPAD and a Bose and they will be happy watching Top Gun in the back seat!
I had a 2013 Acura MDX that had a pop-down DVD player, a suite of audio and video input jacks for gaming systems and headphones for the back seat pax. Never used it! PAX had their 'devices', which they used for entertainment. When I traded the vehicle in, the headphones were still in their original wrappings.
Dynon could easily add per-seat bluetooth to an intercom for those with conventional headsets, but would have charge $$ for it, and your old David Clarks will sound like AM radios. If you want a single-source Bluetooth, add the cheap adapter from Amazon or eBay.
Cheers, Vern