Alesis PEQ-450 manual basics of equalization

chapter 3 • basics of equalization

Q

Qis 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.

Narrow Q Wide Q

40Hz 200Hz 1kHz 10kHz 20kHz

The LOW SHELF setting effects everything below the specified 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

+9dB

+6dB

+3dB

0dB

-3dB

-6dB

-9dB

-12dB

	Gain		Frequency
40Hz		200Hz		1kHz	10kHz 20kHz

HIGH SHELF works the opposite way. When this function is turned on, everything from the set frequency on up will be effected.

PEQ-450 Reference Manual 29