I wonder if that's because they're matched? Add road noise to it, and a noise canceling mic may shine.I have been playing around with different mics on my 955 the last few days. I had the radio into a dummy load and listened to myself with 3 other radios (980SSB, RTL-SDR, and Tecsun PL-330). By a long shot, I think the stock mic has the best sounding audio and is the loudest. Every other mic I have tried with this radio keeps me going back to the stock mic.