©2009 Shure Incorporated
27C1917 (Rev. 5)
Model A15HP
User Guide
Printed in U.S.A.
MODEL A15HP HIGH PASS FILTER
This filter rolls off low audio frequencies to reduce 60 Hz electrical hum,
low-frequency wind noise, air conditioner noise, or stand-and floor-transmitted
low-frequency vibrations.
When loaded with a low-impedance microphone input (800 ohms or more), the
rolloff is 12 dB per octave below 100 Hz.
When loaded with 150 ohms, the rolloff is 3 dB at 100 Hz.
The output is flat above the rolloff point (with a maximum loss of 0.5 dB at 1 kHz).
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