AKE Elektronik,

Willi-Bleicher-Str. 6, 73230 Kirchheim/Teck, Germany.   Website!

What follows is my personal understanding of the systems from AKE Electronik; this is the only Bluetooth enabled motorbike intercom that I have real life experience with.

AKE has three different Bluetooth enabled systems:

The 201 headset for rider only use.
This headset has three profiles - HSP, HFP and A2DP, and can be connected to/paired with multiple Bluetooth enabled devices. It uses the priority switching possibilities, and gives very good connections to GPS's, cell phones and mp3 players, etc.
But this headset is not connectable to other 201 headsets.

To alleviate this, AKE makes a special version of the 201, called the 201i.
The 201i works in HSP master compatible — and therefore connectable with the 201. This will enable communication between the rider and the pillion, but that is it: The 201i does not connect to/pair with any other devices. What this means is that while the rider can listen to music, talk on the phone, etc., the pillion rider will not be able to partake.

So—how do you work around this?  
AKE's solution is the BC-102 pocket repeater.
This is a small battery powered device which lets you could connect/pair two 201 helm sets, channeling all communication between the two sets through the repeater. There is no direct conversation between the two 201 sets: When the rider talks into the microphone, the voice is transmitted to the repeater and the repeater sends the signal to the pillion 201 set.

This BC-102 repeater has three additional input connectors.
One is for charging the internal battery.
There is an AUX-IN for connecting a music device — like a mp3 player.
And, lastly, one IN/OUT input for hooking up a cellphone or a bike2bike PMR radio , etc.

But, be aware that even though the 201 can use the A2DP stereo profile, the BC-102 pocket receiver does not. This means that output music will be in mono only.
And you cannot connect to other Bluetooth enabled devices with the 201's, as long as they are connected/paired to a BC-102 pocket repeater.

The big box — including everything you want.

AKE offers a controller box (PowerCom) that comes in 5 different sizes. They differ as to how many cable connected devices you can hook them up to.
These units are designed for ordinary cable connections to the helmets, but there is a solution for that.
A Bluetooth dongle can be plugged into the helmet output of the PowerCom - and this dongle is then connected/paired to the 201 helm sets.

There are also two or three other Bluetooth dongles available: 
The PBM-H2 gives you the option to use Bluetooth to replace the cable from PowerCom to a cellphone, or to a GPS; that enables voice prompts and makes it possible to connect to a cellphone through the GPS.

The PBM-A2 stereo A2DP dongle lets you skip the cable from the PowerCom when hooking up to a Bluetooth enabled mp3 player.
 

The really nice thing about this system is that you have all the functionality that you are used from the old cable setups, replacing cables to the helmets with wireless Bluetooth connections.

The PowerCom can connect to a lot of different Bike2Bike systems, and has a full priority setup for what source to listen to at any time.
In short, the PowerCom is a very complete and well made unit, with lots of functionality and adjustment possibilities.

With this setup you will have a Bluetooth voice connection to your pillion rider, enabling full stereo music to both helmets. Both helmets can partake in cellphone and Bike2Bike conversations. In fact both helmets can tap into the same audio source, whatever device is connected to the PowerCom.

There are too many options and specification traits to detail them here; take a look on AKE's website to learn more.

A final note about the sound quality of the 201. Fitted to "HighSound" speakers and a Bluetooth enabled mp3 player the 201 helm set sounds surprisingly good—in fact very good!

Naturally, the sound/music quality suffers when passing through multiple Bluetooth units (e.g., Bluetooth enabled mp3-> A2DP dongle-> PowerCom-> PB-HC2 dongle-> 201 helm set). Nothing beats using cables all the way for sonic quality, but this set up is definitely something one can live with and when riding (with wind noise) even more than just that—it's good!

What follows is my current setup, and it's the setup I'll be using on my new BMW K1600GTL.
As I have not been able to test it out on the new bike yet, there may be some changes in the way I'm planning to connect to the Audio platform.  If the Bluetooth output from the Audio platform is not what I'm looking for, I will wire the speaker output directly to the PowerCom unit.

I have 1 PowerCom INNOVA module,
2 201 helm sets with HighSound loudspeakers.
2 PB-HC2 dongles on the INNOVA to communicate with the 201 helm sets.
Cable between the INNOVA and a Midland G7 - for Bike2Bike communication.
A PowerCom operating device - holding Push2Talk and other nice functionalities.
Cable from the INNOVA to other voice sources on the bike.
Cable from the INNOVA to the on board GPS. I intend to dig into the cable going from the GPS to the on board sound system—and connect voice and microphone.
If that proves not to be possible, I will use a PBM-H2 dongle to connect the GPS to the INNOVA. This enables the use of the cell phone option of the GPS.
A PBM-A2 dongle on the INNOVA to grab the music from the bike's music system.
If the sound quality is not what I hope for, I will use a cable to connect the speaker output from the bike — directly to the INNOVA.
I also have a PBM-A2 stereo dongle on the INNOVA - so my pillion rider could connect her Bluetooth enabled mp3 player to the system. She will then be able to operate her mp3 player when riding.

I also have a cable going from the INNOVA to my video camera. This enables recording of voice when filming when we ride. Take a look at my video site, to see how this works out. 

It should not come as a surprise that I am quite partial to the AKE products. Although somewhat pricy, the quality of both units and cables is superb.

The after sale support has also been excellent—probably the best I ever had from a this kind of supplier.

Again, take a closer look on the AKE website—it gives you an exhaustive view of all their solutions and product options.

regards
STeinar