Wireless: Tempest and Beyer DT-280 or DT-290 headsets
After digging a little more into the problem, ended up on the phone with engineering at Beyer, and learned there are 2 versions of the mics in the DT-280 and DT-290 headsets. The newer "V11" has a small pre that is likely looking like high impedance to Tempest. The cause of the problem being an incompatible version of the DT-280 and DT-290.