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iK81 / iK42
USER GUIDE
steps from -40dB to +20dB. The presence of an active Group Overlay parameter is indicated by the '[]' symbol (See Overlays).
This page will also allow users to change the polarity of the selected input from normal to reverse and to mute the selected
channel.
Delay
The delay page which controls the amount of delay associated with the input channel selected and is adjustable from 0 to 998ms.
The delay parameter is adjustable in fine steps at low values; the adjustment becomes progressively coarser as the value
increases. The presence of an active Group Overlay parameter is indicated by the '[]' symbol. See Overlays.
High Pass Filter
System high pass filtering is provided for the input signal. Filter type is selectable from 1st order, Butterworth, Bessel, Linkwitz-
Riley and Hardman. Filter slopes of up to 4th order or 24dB / octave are provided. Not all filter types are available in all slopes.
For example 18dB / octave Linkwitz-Riley filters do not exist.
The Hardman type filter is always described by its order as the filter becomes progressively steeper rather than following a linear
slope so a dB/octave description is not accurate.
Parametric Equalisation
There are nine stages of equalisation available for each input channel, three shelving filters and six parametric filters.
FIR Shelving EQ
The Input High Shelf EQ is implemented using a Finite Impulse Response (FIR) filter, and exhibits a linear phase response; that is
all frequencies are delayed by the same amount. This can be important in applications where different amounts of EQ are applied
to different parts of a speaker cluster, such as to add 'Throw' EQ boost so that parts of cluster which are throwing further can
have HF absorption correction added. If this EQ is not linear phase, then the zones where the speakers combine may suffer
frequency response anomalies. Being a linear phase FIR equaliser, this necessarily introduces some latency delay, which is
constant regardless of the settings. However, when the 'Enable' parameter is set to "Off", it is removed from the signal path
entirely, so it does not add any latency. In this page you can change the frequency parameter from 2kHz to 20kHz, enable/disable
the filter, and change the cut or boost in 0.2dB increments. The presence of an active Group Overlay parameter is indicated by
the '[]' symbol being appended to the Gain value (See Overlays). The filter (and its associated latency) can be completely removed
by setting the enable parameter to the "Off" position. Note that this EQ can only be used in Module Groups if set to 'On'.
See also Latency Delay.
Parametric Filters
Parametric filters are defined by frequency, bandwidth and gain. The frequency is adjustable over the range from 10Hz to
25.6kHz. The bandwidth shown as Width on the screen, ranges from 0.10 octaves to 5.2 octaves. Bandwidth can be shown and
adjusted as Q or Octaves (Oct). Gain is adjusted in 0.2dB increments. The presence of an active Group Overlay parameter is
indicated by the '[]' symbol being appended to the Gain value. (See Overlays).
See also Bandwidth Units in Utilities.
Routing
Routing allows users to route any physical analogue or digital signal channel to any DSP input. This is effectively a matrix mixing
system where all DSPs can be driven from any one input, or from pairs of inputs "1+2", "3+4", "1+3", "1+4", "2+3" or "2+4".
Summed inputs have 6dB of attenuation so that a sum of largely similar programme material remains at the correct calibrated
level.
iK81 / iK42 User Guide V2.3
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