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Chapter 3 ES2 52
ES2 Filter 1 modes
Filter 1 can operate in several modes, allowing specic frequency bands to be ltered (cut away)
or emphasized.
Click one of the following lter mode buttons for Filter 1:
•
Lo (lowpass): Allows frequencies that fall below the cuto frequency to pass. The slope of
Filter 1 is xed at 12 dB/octave.
•
Hi (highpass): Allows frequencies above the cuto frequency to pass. The slope of Filter 1 is
xed at 12 dB/octave.
•
Peak: Filter 1 works as a peak lter. This allows the level in a frequency band to be increased.
The center of the frequency band is determined by the Cuto parameter. The width of the
band is controlled by the Resonance parameter.
•
BR (band reject): The frequency band directly surrounding the cuto frequency is rejected, but
frequencies outside this band can pass. The Resonance parameter controls the width of the
rejected frequency band.
•
BP (bandpass): The frequency band directly surrounding the cuto frequency is allowed
to pass. All other frequencies are cut. The Resonance parameter controls the width of the
frequency band. The bandpass lter is a two-pole lter with a slope of 6 dB/octave on each
side of the band’s center frequency.
ES2 Filter 2 slopes
Most lters do not completely suppress the portion of the signal that falls outside the frequency
range dened by the Cuto parameter. The slope, or curve, chosen for Filter 2 expresses the
amount of rejection below the cuto frequency in decibels per octave.
Slope buttons: Click any button to choose a Filter 2 slope: 12 dB, 18 dB, and 24 dB. The steeper the
slope, the more severe the eect on signal levels below the cuto frequency.
Fat button: Click the Fat button for 24 dB per octave of rejection. Fat mode has a built-in
compensation circuit that retains the sound’s bottom end. By comparison, the standard 24 dB
setting tends to make lower end sounds less rich.