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basics of equalization • chapter 3
30 PEQ-450 Reference Manual
HPF
The HPF button turns Band 1 into a highpass filter. This button
disables the
GAIN and Q knobs for Band 1. When this function is on,
all audio below the Band 1 Frequency setting will be filtered out at a
slope of 12dB per octave.
Think of this function as a severe bass rolloff. It is useful for getting
rid of low-frequency hum, mic bumps, and rumbles.
LPF
The LPF button turns Band 5 into a lowpass filter. This button
disables the
GAIN and Q knobs for Band 5. When this function is on,
all audio above the Band 5 Frequency setting will be filtered out at a
slope of 12dB per octave.
Think of this function as a severe treble rolloff. It is useful for getting
rid of tape hiss, TV or computer monitor whine, and other high-
frequency noises.
0dB
+3dB
+6dB
+9dB
+12dB
-12dB
-9dB
-6dB
-3dB
40Hz 200Hz 1kHz 10kHz 20kHz
Frequency
Gain