I have the Autocom Pro M1, now old model.
And I can only hear a bit of back noise, when the phone is charging and I actually make a call.... Other than that the set up is quiet !
I plug the Boostaroo for the stronger output. I thought that just my MP3 is not to loud, but was told that all harddrive MP3's are like that. Apparently they save battery power by limiting the volume...
The XM radio is louder in fact.
The Autocom has the intercom built in, so no worries in the future. It's headset comes with the microphone as well. But you could unplug it if you don't want to use it.
If you contact Autocom
http://www.autocomamerica.com/docs/home.cfm , they should be able to tell you who makes the earbud headset for their units. For pure music, the earphones are suppose to give you better, dirrect sound. The Autocom doesn't make/sell them though. There is someone else and I forgot who does that.
I think some other company (may be the Starcom or Motocom), makes kits that are expandable and they start with just the headphones.....
If music is all you need though, I'd start with the ~$19 KOSS earbuds from Radio Shack
http://www.radioshack.com/product.asp?cata...%5Fid=33%2D1167 ...
If you want to go more fancy than maybe try these...
http://www.aerostich.com/product.php?produ...&cat=337&page=1
But if you want to transmit, then it's a different story
BTW, if you look at the Ayutocom, check the Active 7 Smart. Way less expensive with almost all the same features. There is no portable power supply, but since I switched to the bike - power, I haven't used the 9V battery anyway....
Cheers,