Close range sounds, wind and fast movements of the microphone boom, all may cause interfering noises. To avoid these unwanted sounds, use the Neumann Foam windscreen on the appropriate Neumann microphone models. Typically, windscreen is made out of open-cell polyurethane foam. This windscreen does not cause interfering resonances and do not influence the directional pattern. Only in the upper frequency range is the output level slightly attenuated. The wind noise attenuation is measured without electrical filtering in a turbulent air stream traveling at 20 km/h, generated by a noiseless wind machine. It is designed for Windscreen for U 67, U 87 (Ai), TLM 50, TLM 103, M 147 Tube and TLM 170 (R). The windscreen suppresses wind noise approximately 26dB and attenuation at 15 kHz 3dB.