FREQUENCY SELECTION
Custom crossover frequency modules will allow you to create notch filters or overlap frequencies to
“equalize” in or out a desired response.
High and Low crossover frequencies in the AFMHD are selected by inserting frequency modules in
sockets in the internal PC board.
In order to change a frequency module, remove the four machine screws that hold the cover and
remove the cover. Remove the frequency module you wish to change, and insert the new module in
its place.
See Fig. 1 for module locations.
AF/2HD can be defined as either high or low pass fiters allowing the following
combinations:
CHANNEL A: HIGHPASS CHANNEL B: LOWPASS
GAIN (dB)
GAIN (dB)
20Hz
X
20kHz
20Hz
Y
20kHz
FREQ. (Hz)
FREQ. (Hz)
CHANNEL A: HIGHPASS CHANNEL B: HIGHPASS
GAIN (dB)
GAIN (dB)
20Hz
X
20kHz
FREQ. (Hz)
CHANNEL A: LOWPASS
GAIN (dB)
20Hz
Y
20kHz
FREQ. (Hz)
CHANNEL B: LOWPASS
GAIN (dB)
20Hz
X
20kHz
20Hz
Y
20kHz
FREQ. (Hz)
FREQ. (Hz)
NOTE: X AND Y ARE VARIABLES. THEY DEPEND ON THE MODULES USED ON THE BOARD.
WARNING! TURN OFF SYSTEM BEFORE REMOVING MODULES!
BAND SELECTION
Both channels in the
