EM Acoustics Di06 Product User Manual page 15

Drive Modules
The Di Series processor has a new way of ordering and grouping channels in order to give a more
speaker-based approach to controlling, designing and recalling speaker configurations; these are
called Drive Modules. A Drive Module is the Processing provided by one Input DSP Block, and a number
of Output DSP Blocks, which are associated with one-another by means of routing. For example, if
Input DSP Block B is routed to Outputs 3 and 4, then this is a 2-way Drive Module with Input DSP
Block B forming the 'Master' control, and Output DSP Blocks 3 and 4 providing the driver-related
control. Overall, this forms the processing typically for one loudspeaker sub-system. The System
Engineer Drive Module control panel for this sub-system may then be used for control and monitoring
of the associated speaker.
Drive Modules may be included in Module Groups, which use the Parameter Overlay feature in the
Device to achieve trouble-free Grouping in the System Engineer application.
The Presets in the Device are Drive-Module centric, and are used to configure individual Drive
Modules rather than the whole device.
Importantly, Drive Modules move the focus away from the processing device, and onto the
loudspeaker systems.
A Drive Module Preset may be broken apart into Components, allowing any output to be used for any
component within a Drive Module Preset (i.e. any driver in a loudspeaker subsystem).
See Overview of Modules
Overlays
When the Device is used in Modules view in System Engineer, this allows the modules to be grouped
Overlay roups
into G
modules
in that group, whist maintaining independent parameter values across each group. This is
achieved in the device by combining the parameters for all the layers for a given section (Gain Delay,
EQ etc.). When an Overlay parameter is active, the Overlay indicator will become illuminated. The
combined Gain or Delay etc. associated with a given section is shown on the module panel in System
Engineer, within square brackets [ ] under the Delay and Gain for each input channel. The combined
EQ curve is shown in an olive colour. The Input Mute button in System Engineer will flash if an overlay
mute is active. An input overlay mute is indicated on the mute/clip indicator for that channel flashing.
ee Overlay Flush
S . Note that overlays are not stored in presets or snapshots or carried in settings
files.
LIR Linear Phase Crossover Filtering
The Device also includes a new type of crossover filtering "Linear Impulse Response" (LIR) crossover
filtering, which results in a Linear Phase crossover that has a constant delay regardless of frequency
(unlike other types of crossover which delay different frequencies to a different extent, thus
smearing the arrival time). The LIR crossover can thus be described as having a flat Group Delay
response, and thus entirely free of Group Delay Distortion.
The shape of the LIR crossover filter is quite similar to a 4
and maintains zero phase difference between the adjacent bands across the crossover region to keep
the polar response rock steady.
. These groups allow various Input (master) parameters to be adjusted in
order or 24dB/Oct Linkwitz-Riley filter,
th
all
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