Bruce, i use a Shure 450 Series II and it works fine and you dont need the TXEQ or BIAS. Roger DL2YDP -- View this message in context: http://elecraft.365791.n2.nabble.com/Appropriate-Mic-for-K3-new-tp7624456p7624472.html Sent from the Elecraft mailing list archive at Nabble.com.