How do I change the roll off frequency of the A15HP
FAQ #1Question:
How can I change the roll off frequency of the Shure A15HP High Pass filter?Answer:
The standard roll off frequency of the A15HP high pass filter is 100 Hz, at a rate of 12 dB per octave. This assumes that output of the A15HP is connected to a load of 1,000 to 2,000 ohms. This is the typical input impedance of a professional microphone mixer. It is possible to change the corner frequency by replacing the two 10 µF capacitors with values as follows:










You can calculate the capacitor value required for a particular rolloff frequency using the following equation:
(100 / desired rolloff frequency)^{2} x 10 = new capacitor value(in microfarads)