Alesis PEQ-450 Reference Manual page 29

Q
Q
is a ratio of the center frequency divided by the bandwidth. A Q
setting of 0.5 is a wide band of boost or cut, where a setting of 3 is a
narrow band of boost or cut. A setting of 0.25 is even narrower and is
typically used for notching a small frequency due to reduce noise.
The Q control of the PEQ-450 has a range of 0.25 to 16.
The
LOW SHELF
frequency. For example, if Band 1 is set for Low Shelf and the
frequency is set to 800Hz, everything from 800Hz on down will be
boosted or cut.
+12dB
-12dB
HIGH SHELF
everything from the set frequency on up will be effected.
PEQ-450 Reference Manual
Narrow Q
40Hz
setting effects everything below the specified
+9dB
+6dB
+3dB
0dB
-3dB
-6dB
-9dB
40Hz
works the opposite way. When this function is turned on,
chapter 3 • basics of equalization
200Hz 1kHz
Frequency
200Hz 1kHz
Wide Q
10kHz 20kHz
10kHz 20kHz
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