miniDSP Ltd, Hong Kong /
www.minidsp.com
/ Features and specifications subject to change without prior notice
8
Computer connectivity is used to perform acoustic measurements and generate digital room correction filters
for Dirac Live®. Up to four sets of correction filters can be stored on the
NanoAVR DL
processor and recalled
from the front panel, via an infrared remote, or with the miniDSP smartphone app. Once the processor is fully
configured, the computer is no longer needed.
1.2
H
OW
D
IRAC
L
IVE
®
WORKS
The miniDSP
NanoAVR DL
HDMI audio processor includes Dirac Live®, a premium mixed-phase room correction
technology. This technology is used not only in home stereo and home theater systems but also in cinemas,
recording studios, and luxury cars.
As with any room correction system, Dirac Live® corrects the system’s
magnitude response
(often referred to
imprecisely as “frequency response”). In contrast to fully automated systems, Dirac Live® corrects the
magnitude response towards a user-adjustable
target response
. The target response takes account of the
natural frequency range of the loudspeaker system and the normal effects of loudspeaker dispersion on the
measured
in-room
magnitude response.
Illustration of Dirac Live® magnitude response correction
In addition, Dirac Live® corrects the system’s
impulse response
, which reflects how the system responds to a
sharp transient such as a drumbeat. Reflections, diffraction, resonances, misaligned drivers, and so on, all
combine to smear out the transient. An ideal loudspeaker has none of these, so correcting the impulse response
makes the speaker in the room behave much more like that ideal loudspeaker. The impulse response is a critical
factor for accurate sound-staging, clarity and bass reproduction. Dirac Live® employs a sophisticated analysis
algorithm to make the optimal correction across the
whole
listening area, not just at a single point.
