Bose A20 all day long. I had a Bose aviation X (older Bose headset) that worked great, but I got the A20 last December since it can do Bluetooth to my phone, ipad, and gamin aera 660. I kept the old Bose headset for the copilot seat. I think there is a promotion where you get a free Bose Bluetooth speaker right now. I'm not sure when that deal goes away though.

N8395M 1970 A150K
The Carolina Swampfoxes founding member
I've landed my Aerobat in the following states:
[Linked Image from visitedstatesmap.com]