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Overview - Chapter 3
Q20 Reference Manual 33
Shelving EQs
Lowpass Shelf and Highpass Shelf
A shelving EQ can boost or cut frequencies in its pass band, while allowing the
frequencies outside its pass band to go through it. The shelving EQs of the Q20
provide gains from -14dB to +14dB in 0.1dB increments. Shelving filters are well
suited for applications in which high or low frequencies need to be boosted or cut,
but the remainder of the audio signal is to pass through unchanged. Applications
for shelving EQs include removing high end hiss, and Òtightening upÓ the sound of a
bass instrument. The Highpass Shelving EQ is useful to compensate for a lackluster
source that needs its high end brightened. The Lowpass Shelving EQ can be set to
cut low frequencies to eliminate PA rumble.
Lowpass Shelving EQ Highpass Shelving EQ
+14dB
+11dB
Cutoff
Frequency
0dB
-11dB
-14dB
Gain = +14dB
(boost)
Gain = -14dB
(cut)
+14dB
+11dB
0dB
-11dB
-14dB
Cutoff
Frequency
Gain = +14dB
(boost)
Gain = -14dB
(cut)
Single Band EQs
1 Band Low Parametric and 1 Band High Parametric
A single band parametric EQ allows frequencies within its passband to be
amplified (boosted) or attenuated (cut) while allowing the remainder of the audio
information to pass through unchanged. The Q20 provides a low frequency version
(20Hz to 2000Hz), and a high frequency version (1500Hz to 10kHz). Single band
parametric filters work well to highlight specific frequencies in a mix; for instance,
bringing a tambourine to front and center, or boosting a repetitive bass line to
achieve a realistic Òinner-city throbÓ.
+14dB
+11dB
Center Frequency
1 Band Parametric
(boost w/ low bandwidth)
1 Band Parametric
(cut w/ high bandwidth)
0dB
-4dB
Center Frequency
Bandwidth
Bandwidth
0dB
-7dB