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LCD MENU STRUCTURE
© Polycom, Inc. 35 VORTEX EF2241 Reference Manual
P
ARAMETRIC
EQ M
ENU
The input equalizer is comprised of up to 5 bands of filtering. The whole group of fil-
ters for the channel can also be enabled/disabled without losing the settings for each
band. For each band, you first select the type of filter from the following: Parametric/
Peaking, High Shelf, Low Shelf, Lowpass, or Highpass.
Parametric/Peaking.
• Center Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
• Bandwidth: in octaves, between 0.05 and 2 octaves in 0.05 octave steps.
• Gain: in dB, between -20 and +20 in 1 dB steps.
High Shelf.
• Center Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
• Bandwidth: in dB/octave, between 1 and 24 dB/octave, but is always less
than or equal to 1.2 x Gain.
• Gain: in dB between -20 and +20 in 1 dB steps.
Low Shelf.
• Center Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
• Bandwidth: in dB/octave, between 1 and 24 dB/octave, but is always less
than or equal to 1.2 x Gain.
• Gain: in dB between -20 and +20 in 1 dB steps.
Lowpass.
• Cutoff Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
Highpass.
• Cutoff Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
Center frequency on Parametric/Peaking is the point with the most (or least) gain.
Bandwidth is the width halfway up the peak (so if the peak is 10 dB, it is the width
between the points where the gain is 5 dB).
Center frequency on shelving filters is the frequency where it crosses the point half-
way between 0 dB and the gain of the filter, halfway up the slope.
Figure 24. EF2241
Parametric EQ sub-
menu
Parametric EQ
Frequency
Filter Type
Bandwidth
Slope
Gain
Filter Enable
Input/Output EQ
Band
Channel