Shure A15HP High Pass XLR Microphone FilterEliminate Noise with the Shure A15HP High Pass Filter The Shure A15HP High Pass Filter is an in line audio filter designed to reduce low frequency noise in your audio system. By attenuating frequencies below 100 Hz, this filter helps eliminate hum, rumble, and stage noise, resulting in clearer and more professional sound. Specifications: Brand: Shure Model: A15HP Connector: Female XLR to Male XLR Attenuation: 12dB per octave below 100 Hz