To ask the obvious but obligatory: Any LPF engaged on the console/DSP or transmitters? Does the audio sound the same in other console channels?
Also, do you have any acoustical analysis software (SMAART, SYSTUNE, etc): test from the TX mic input to the receiver output compared to a straight wire.
Positive that there were no LPF's in line. I did try running a different brand wireless into the mixer's input in addition to a wired handheld, and they both sounded fine.
I didn't have a chance to do any analysis on the output of the RX. The results I was getting from my ears and from the comparison to the other mics was, for the moment, all the analyzation I needed and had time to do.
