A "slave" device to put into the other ear would be nice. A2DP on only one ear is kinda weird,... After having music in one ear for an hour - stopping it makes it feel weird talking to ppl.
A small slave device with same speaker and volume as the primary, to put into the other ear, would solve that - and since it dont need a microphone, make it small so it all fit inside the ear.
I had a bluetooth headset about 5 or so years back that actually supplied a second speaker.
To make a long story short ... the speaker in the headset and the additional speaker must not have been exactly the same, as one speaker sounded louder and different than the other.
I think if you are looking for true "stereo" ... one of the stereo bluetooth devices would probably suit your needs better.
© 2013 Jawbone.