Yes, most (if not all) wireless systems that I've used have a light compression (usually 2:1, IIRC). The Airline 77 uses the same capsule as the ATM 350. The WI 5 uses the Roam Elite for the mic element (I don't know who makes that capsule). I think that the WI 5 is frequency agile, but I'm not positive.
If they're new, they should be in compliance. I can't speak for changes up the road, though. My Airline 77 is illegal
If they're new, they should be in compliance. I can't speak for changes up the road, though. My Airline 77 is illegal