Several commercial options exist for prevention of the pseudo-sound often introduced by a microphone in the presence of a flow field. One such device is a so-called ‘‘slit-tube.’’ A slit-tube is a tube approximately the diameter of the microphone with which it is used. The length of such a tube can vary anywhere from 25 cm to 50 cm, and it is most generally fit with a stream-lined noise cone. In theory, a perforated slit along the length of the tube encourages net cancellation of turbulent pressure variations, while not interfering with the acoustic field. This poster compares the effectiveness of two similar slit-tube designs. Each tube was placed inside of a wind-tunnel and exposed to white noise. The effects of increasing flow velocities on the transfer-function between the source and receiver signals are analyzed.