Crown I-Tech 4x3500HD DriveCore Series Operation Manual page 19

7 Advanced Operation
7.7.9 Input EQ and Output EQ
These screens let you adjust channel equalization for up to 16 frequencies. You
can select filter type, frequency, gain, and bandwidth in octaves or Q as set by
the user preferences in System Architect. Changes to the equalizer's frequency
response can be done by typing in parameters or by click-dragging the response
curve.
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I-Tech HD DriveCore Series Power Amplifiers I-Tech HD DriveCore Series Power Amplifiers
7 Advanced Operation
7.7.10 Crossover Filters
The Crossover section lets you use infinite impulse response (IIR) or
finite impulse response (FIR) filters for the crossover.
FIR advantages: FIR has a longer processing latency but has less
phase artifacts compared to IIR. FIR allows for brickwall, 48dB/oct and
24dB/octave filters with zero phase shift.
IIR advantages: FIR has one processing block per channel; IIR has one
or more. For example, you can place an FIR at only one end of a channel,
but you can place an IIR at either end.
Operation Manual Operation Manual
The amplifier contains four FIR blocks which can be used in various Each audio channel has three separate places where filters can be placed in the
configurations: system: input EQ (16 filters), Crossover, and Output EQ. Up to 24 filters per
In Duplicate mode the same settings are used on both channels, allowing channel are available, plus crossover filters and 4 filters for the signal
two FIR filters per bandpass. In Unique mode the FIR filters are limited to generator. Each filter has up to +/-24dB of gain. The following filters are
one per bandpass. However, if the High Pass of Channel 1 and Low Pass available:
for Channel 2 are set to identical slopes and frequencies, you can use FIR • Lowpass: Bessel 2-4, Butterworth1-4, and Linkwitz-Riley 8
on all the bandpasses. The logic for this operation is built into the software • Highpass: Bessel 2-4, Butterworth1-4, and Linkwitz-Riley 8
controls. In addition, the Processing (FIR) latency sets the minimum • Lowshelf: Low-frequency shelving EQ
frequency that can be set for an FIR. • Highshelf: High-frequency shelving EQ
• Lowpass EQ: Variable bandwidth, can be expressed as Q (0.100 to 35) or
A polarity inverter button lets you change the polarity of each channel Octaves (0.041 to 6.672)
• Highpass EQ: Variable Q from 0.1 to 25
independently.
• Parametric EQ: Variable Q form 0.1 to 35
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