I've tried the PMMN4025 and PMMN4050 remote speaker microphones. When transmitting, the individuals listening state that I am clear and understandable. However, some individuals are annoyed and stated that it sounds like my voice is muffled a bit and/or sounds like I'm in a tunnel. Anyone else having this type of problem? If so, did you discover a way to correct this and/or did you find another remote speaker microphone that works for you? Any programming software suggestions to correct this? BTW, I'm transmitting on an analog UHF channel.