How The Ddrc-24 Works - miniDSP DDRC-24 User Manual

1.2 H DDRC-24
OW THE
The processing in the ground-breaking miniDSP DDRC-24 is best described in terms of a signal flow diagram:
One of the three input stereo sources is selected (by the user) and input into the Dirac Live processing blocks,
which implement digital room correction (DRC). The Dirac Live outputs are fed into a 2-in 4-out matrix mixer.
The matrix mixer is what enables the DDRC-24 to be used in a number of different application scenarios.
The outputs from the mixer are processed through a comprehensive set of DSP functions – crossover filters
(high pass and low pass), parametric EQ, and individual gain and delay adjustments. These are all optional – you
can configure them if you want to, according to your particular application. Finally, the 4 output channels are
converted to analog so they can be fed to your power amps or to your subwoofer(s).
While the description of the signal processing flow is from inputs to outputs (left to right in the diagram), the
order in which you configure the DDRC-24 is basically the reverse. Because Dirac Live measures everything in the
diagram that comes "after" it (including the speakers and room), the matrix mixer and output channel
processing need to be set up before running a Dirac Live calibration. This configuration is done with the DDRC-
24 plugin, described with concise examples in Section 4 and in full detail in Section 9.
Once you have set up the mixer and output channel
processing, quit the DDRC-24 plugin and start Dirac Live
Calibration Tool for miniDSP (DLCT). This program
executes the measurement and optimization regime
from Dirac Research that is used to generate the Dirac
Live room correction filters. There are three key steps.
1. Measure the response of your room in nine
different locations (Section 5).
2. Set up a target curve (Section 6). You use this to
generate customized corrected responses to suit
your system, room, and preferences.
3. Create optimized correction filters and load them
onto the DDRC-24 (page 41). You can load up to
four sets of corrections filters with different target curves.
With that all done, program a remote control and sit back and enjoy the fruits of your labor! Dirac Live's mixed-
phase filtering technology will improve the imaging and clarity of your system, minimize the effects of room
modes and resonances, and improve dynamics and clarity.
miniDSP Ltd, Hong Kong / www.minidsp.com
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/ Features and specifications subject to change without prior notice
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