Page 17
HF-100 Users Guide
frequency. Any frequencies below this frequency will be quickly a enuated un l the sound is
en rely removed. To modify this value, click next to the high bandpass frequency and enter a
new frequency (in Hz). Once entered, click into another
fi
eld or press the tab key to a
ff
ect the
change.
Low Bandpass Filter
Similarly, the low bandpass
fi
lter will a enuate any frequencies that are higher than the
speci
fi
ed low bandpass
fi
lter frequency. To modify this value, click next to the low bandpass
frequency and enter a new frequency (in Hz). Once entered, click into another
fi
eld or press the
tab key to a
ff
ect the change.
Dynamic Range Compression (DRC) Se ng
Dynamic Range Compression (DRC) Se ngs
Dynamic range compression (DRC) is very di
ff
erent than a bandpass
fi
lter. Instead of reac ng to
frequencies, the DRC reacts to the sound levels or averaged amplitude of sound. Think of DRC
like an automa c volume control knob that adjusts based upon the sound level the device is
hearing. A common example is a family member staying up late to watch an ac on movie. If an
explosion happens during the movie you would not want to wake the kids. Loud sounds over
a certain threshold are reduced while lower volume sounds are unchanged or increased (e.g.
expansion or upward compression).
In a classroom environment, the HF-100 can be instructed to quickly lower the output volume
