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All 12 lters offer an identical selection of lter types (see
below). The lter parameters are displayed across three screen
pages; press the h and i buttons to scroll between pages. For
each lter, ve EQ parameters are available for adjustment:
Enable – the Enter button enables the lter. Default is Off.
Type – 16 different algorithms are available for each lter. The
default is Bell-Sym. The full list is:
TYPE DISPLAYED AS: GAIN? Q?
Bell-Symmetrical Bell-Sym
Bell-Asymmetrical Bell-Asym
Notch Notch
Low-Shelving 6dB/oct Low-Shelv 6dB/o
Low-Shelving 12dB/oct Low-Shelv 12dB/o
High-Shelving 6dB/oct High-Shelv 6dB/o
High-Shelving 12dB/oct High-Shelv 12dB/o
All-Pass 90° All-Pass 90
All-Pass 180° All-Pass 180
Low-Pass 6dB/oct L-Pass 6dB/o
Low-Pass 12dB/oct L-Pass 12dB/o
Low-Pass Vari-Q 12dB/oct L-Pass VarQ 12dB/o
High-Pass 6dB/oct H-Pass 6dB/o
High-Pass 12dB/oct H-Pass 12dB/o
High-Pass Vari-Q 12dB/oct H-Pass VarQ 12dB/o
Band-Pass Band-Pass
The Gain? And Q? columns in the table show whether these
two parameters are xed or available for adjustment () for
each lter type. Note that Type is a common parameter which
applies to all 12 lters making up the equaliser.
Frequency – this shows the centre frequency of the selected
lter. It may be varied over the range 10 Hz to 22 kHz, in 0.1
Hz increments. Note that the default values are at standard
frequencies:
FILTER DEFAULT FREQUENCY
1 31.5 Hz
2 63.0 Hz
3 125 Hz
4 200 Hz
5 315 Hz
6 500 Hz
7 800 Hz
8 1.25 kHz
9 2 kHz
10 3.15 kHz
11 6.3 kHz
12 12.5 kHz
Gain – for lter types allowing adjustable gain, this parameter
allows between -40 and +15 dB of gain to be applied at the
selected frequency.
Q – for lter types allowing adjustable Q, the bandwidth of the
lter section may be set in the range from Q = 0.1 (wide) to 48
(a very narrow notch).
IMPORTANT NOTE: The input section’s parametric equaliser
function is not available if the Intelli-X
2
’s sample rate is set to
176.4 kHz or 192 kHz.
Compressor
The dynamic range of the input channel signal can be controlled
with the Compressor section. All the normal compressor
parameters are available for adjustment:
Enable – either the ENABLE or Enter buttons may be pressed
to enable the compressor. Default is Off.
Threshold – this is the input signal level above which
compression is applied. Signals above the Threshold (i.e., the
louder part of the programme) will have their dynamic range
reduced to a degree set by the Ratio control (see below).
The Threshold is adjustable between -80 dBFS and 0 dBFS
(the default value). When the signal level exceeds the threshold
– i.e., when the compressor is applying gain reduction – the
Comp LED at the top of the input signal meter illuminates.
Ratio – this controls how much the louder signals are
compressed by. The default is 1:1, which means no compression
is applied, and the dynamic range of the output signal is the
same as that of the input signal. A ratio of 2:1 means that
signals above the threshold have their dynamic range halved.
The ratio may be adjusted in the range 1:1 (no compression) to
20:1 (generally regarded as limiting).
Soft-Knee – if this checkbox is ticked, the value of Ratio
increases gradually for signals around the threshold level.
This can reduce any undesirable artefacts of gain reduction.
Attack – this sets how rapidly the compressor acts when the
programme level exceeds threshold. The default value is 5 ms,
and attack can be set in the range 0.5 ms to 100 ms.
Release – this sets how long it takes the gain reduction to
be removed after the signal level has dropped below the
threshold. The default value is 250 ms, and release can be set
in the range 5 ms to 5 s.
Side-chain – this is the internal control path which monitors the
signal level and determines the amount of gain reduction to be
applied. Normally the path has a Flat frequency response, but it
may be set to High-Pass or Band-Pass if preferred.
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