When I was first trying to install, I thought that BT was the best way to go for rider/pillion communication. But I hit two snags.
i) I couldn't get the Edge to reliably re-establish communications with the other edge and with the Zumo.
ii) There were three devices all trying to talk to each other via BT:
Phone to XT
XT to Edge
Edge1 to Edge2
I came to the concluison (right or wrong, I don't know - I was jsut starting out with this) that those 3 BT connectins were not possible.
The order of connection seems to be important with establishing any communication - and I cannot do with that at the side of the road, in the blazing sun, desperate to get some fast air flowing past me.
Paramount for me was the rider / pillion communication. Even that would not connect reliably every time by BT - not just by turning the units on. I didn't want to have to press a button to pair every time. I wanted switch on and go.
So - I paired the two Cardo Packtalk Edges using the mesh system. (DMC) - creating a group of two members.
This has worked reliably every time. It doesn't matter who turns on first or whether the satnav is on or off.
Then it was the normal arrnagement for BT to the XT - XT to Edge. Phone to XT.
This gives me Phone music to the XT to the Rider Edge (not that I want that - it has never worked out successfully even with the autocom. Stuttering playback.)
It gives me MP3 playback from the XT - perfect, but I rarely use it.
All sound from the XT comes to the rider Edge.
Phone call is directed to and from the rider edge.
The Cardo manual describes a way of linking to a GPS device. Ignore that. Once the phone is connected to the XT, the XT behaves like a phone to other devices. The XT is paired to the edge as a second phone.
If my pillion wants it, the second edge can be paired to a second phone.
Both Edges can play their own FM radio stations throuhg their own headsets.
Two things I am not so keen on are the time delay - although you don't notice it unless there is no other noise to drown the words from mouths.
There is no 'foldback' - ie you cannot hear your own voice when you speak. This is odd for autocom users. The mics on the autocoms have a Vox trigger level, so quiet muttering do not trun on the transmission. So my normal habit of making comments to myself when riding, which normally go unnoticed, are now picked up. I'm hypercritical of my own riding from a safety point of view so if I find myself in the middle of the road on a right hand bend (UK remember, read 'left hand bend' if you drive on the right), when I should be way over to the outside of the bend, I'll mutter something like -"That was stupid John". Which doesn't inspire much confidence in the pillion, and the surprise reply back - "What's Up, What's Up ?" (Yorkshire for 'What is the matter').