CONSOLE AI | Glossary | 312
• Butterworth Crossover. A crossover using a low-pass filter design characterized by a maximally flat
magnitude response. This results in no amplitude ripple in the passband.
• CD Horn EQ. Horn drivers used in arenas and auditoriums have aninherent 6dB/octave high frequency
rolloff. The CD Horn EQ compensates for this characteristic.
• High Pass. A filter that passes high signal frequencies while attenuating low frequencies.
• High Shelving. Provides boosting or attenuation of frequencies above a designated frequency. The
transition between the spectrum above and below the designated frequency occurs at a fixed 6dB/
octave rate. The gain or loss above the corner frequency is adjustable to +/- 15dB.
• Linkwitz-Riley Crossover. A fourth-order crossover consisting of a cascaded second order Butterworth
low-pass filter. Offers a vast improvement over the Butterworth crossover and is the de facto standard
for professional audio active crossovers.
• Low Pass. A filter that passes low frequencies while attenuating high frequencies.
• Low Shelving. Provides boosting or attenuation of frequencies below a designated frequency. The
transition between the spectrum above and below the designated frequency occurs at a fixed 6dB/
octave rate. The gain or loss below the corner frequency is adjustable to +/- 15dB.
• Notch. Passes most frequencies unaltered, but attenuates those in a specified range (e.g., the notch).
Center frequency range is 20.00Hz to 20.00kHz. Bandwidth is from 0.05 to 5.00 octaves in 0.01 octave
increments. Level is fixed at -80dB.
• PEQ (Parametric Equalizer). A multi-band variable equalizer with control of gain, center frequency,
and bandwidth. A properly configured PEQ enables Converge Pro devices to offset speaker anomalies
and room acoustic imaging deficiencies. Center frequency range is 20Hz to 20kHz in 0.01Hz
increments. Bandwidth is 0.05 to 5 octaves in 0.01 octave increments. Level range is -15 to +15dB in
0.5dB increments.
First Mic Priority
Increases the audio level required to gate on additional microphones after the first mic is on. This helps
ensure that only one mic gates on when a person speaks.
Gain
The amount a signal is increased over a given reference, typically 0, normally specified in dB (decibels).
On Converge Pro 2 devices, gain is adjustable from -65 to 20dB (85dB range) in 0.5dB increments.
Gain Structure
A set of configuration parameters that define the gain characteristics of a signal. The optimal input gain
setting is one which provides both an adequate signal-to-noise ratio and reasonable headroom.
Gate Ratio
Specifies how much louder the microphone audio level must be over the ambient sound level before a
microphone gates on.
Gating
The activation and deactivation of mic inputs. Converge Pro 2 provides three types of microphone gating:
• Auto. The microphone will gate on according to the input level, assigned gating parameters, and gating
group.
• Manual On. The microphone will gate on unless it exceeds the NOM requirements of the gating group.
• Manual Off. The microphone is deactivated.
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