Shure A15HP

This high pass filter rolls off low audio frequencies to reduce 60 Hz electrical hum, low-frequency wind noise, air conditioner noise and stand or floor transmitted low-frequency vibrations.

When loaded with a low-impedance microphone input (800 ohms or more), the rolloff is 12 dBs per octave below 100 Hz. When loaded with 150 ohms, the rolloff is 3 dBs at 100 Hz. The output is flat above the rolloff point (with a maximum loss of 0.5 decibels at 1 kHz).

Specifications:
• Frequency Response: Flat above rolloff point; -0.5 dB maximum at 1 kHz
• Impedance: Designed for 150 ohm rated microphones and inputs
• Distortion: 2.5% maximum (100 mV input, open circuit output)
• Connectors: Input: 3-socket XLR connector; Output: 3-pin XLR connector
• Case: Full magnetic shield, steel with gray enamel finish
• Dimensions: 19 mm (3/4 in.) diameter; 114 mm (4 1/2 in.) long