Bob,

fyi - my DC ANR headset is panel-powered. However, I also have the
battery pack so I can use the headset in any aircraft.


That's a smart solution. Bose and Lightspeed don't offer that, AFAIK.
Not sure about Sennheiser, but I think it's either/or with them, too.

--
Thomas Borchert (EDDH)