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DX4.0 USER GUIDE
Input
AES3 / Dante® Inputs
In addition to the usual analogue inputs, the DX4.0 can also accept AES3 digital inputs. The same physical XLR sockets are used for both
analogue and AES3 inputs; the function of these being determined by the Type parameters in the Input Type menu. The input sockets 1
and 3 are used to input pairs of AES3 channels, so setting the input to "AES3" on either input 1 or input 2 will cause the other channel
to change also. Similarly, adjusting the setting of input 3 will affect input 4 and vice-versa. When an input socket is selected for AES3
operation, the "AES3" indicator under the input meters will illuminate.
There is no 'standard' for the relative gains between analogue, Dante and AES3 so it may be necessary to adjust the digital input gains to
normalise them. So that the relative gain between an analogue input and an AES3 input can be normalised, it is possible to adjust the gain
of the AES3 channel using the Input Route AES3 Gain parameter. For example, to achieve 0dBFS = +18dBu, set the digital trim to -2dB.
To achieve 0dBFS = +24dBu, set the digital trim to +4dB.
This device will automatically select the correct sample rate from the incoming stream between 28kHz and 108kHz.
It is also possible to select any channel(s) as being sourced from Dante. To do this, connect the Dante network connection to the connection
on the rear of the DX4.0, and set the relevant Input Type menu parameter to Dante.
When AES3 or Dante is selected on any input, the "Digital In" indicator above the encoders will illuminate. This indicator will come on even
if there are no cables plugged into the input XLRs or Dante port on the DX4.0.
Again, it is possible to set the relative gain between an analogue input and Dante using the Input Trim Dante Gain parameter.
The DX4.0 will automatically select the correct sample rate from the incoming stream.
Automatic Input Selection (Fallover)
When a Dante input is installed, it is possible to configure the input selection to be automated. The Input Type screen has a Fallover
parameter, which defaults to Manual, allowing you to select what Type of input you wish to use. When "Fallover Dante>AES3" is selected,
then the Dante source will be automatically selected if it has a valid audio stream on it. If the Dante stream should fail, then AES3 is
automatically selected instead. Note that automatic selection will take precedence over manual selection, so if you try to manually select
Dante when there is no valid Dante stream, then it will revert to AES3. Similarly, if "Dante>Analogue" is selected, then Dante will be
selected unless the stream fails, in which case AES3 will be used.
Gain and Polarity
The gain page of the input channel selected allows users to increase or decrease the amount of signal going into the selected input. Using
encoder "A" will change the value in 0.2dB 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, using
encoder "B". Using encoder "C" will 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.
Also 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.
DX4.0 USER GUIDE V1.0
Copyright © 2020 Martin Audio Ltd.
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