Sound Diffraction Spheres The SBK 130 sound diffraction sphere slips onto the KM 130, KM 131 (D) and KM 183 (D) pressure microphones. While sounds coming from the front-half space are emphasized by up to 2.5 dB between 2 kHz and 10 kHz, sounds arriving from the rear-half space are attenuated by 2.5 dB max in the range above 5 kHz. Inner Ø 22 mm. Used - MINT CONDITION
