MA7100HP | MA9100HP Owner's Manual | rev1.3 20240612
Pg 38 of 45
©2024 Harman International | Features, Specifications, and Appearance subject to change without notice.
DIRAC LIVE
An additional license and calibration microphone are required, please visit:
live.dirac.com
There is a proprietary automatic loudspeaker calibration function built into your Receiver from Dirac Research. Using a
PC/MAC based application, this attempts to set the essential speaker settings for all the speakers in your system. It also
calculates room equalization (Room EQ) filter values to remove some of the worst effects of resonant frequencies in the
listening room.
A calibration microphone should be inserted into a USB socket on a PC or MAC connected to the same network as the
Receiver and positioned as directed by the Dirac Live PC/MAC application. This microphone picks up the special calibration
tones generated by the speakers when Dirac Live application is run. The Receiver then analyses the signal and computes:
• speaker delays
• speaker level
• problem resonant frequencies in the room which need control by filtering.
To help the system be as accurate as possible when performing Dirac Live setup, there are a few guidance rules that should
be followed:
• Minimize any background sounds in the listening room and other nearby rooms.
• Close all windows and doors in the listening room.
• Turn off all fans including air-conditioning systems.
• Mounting the microphone on a tripod or similar.
• Position the calibration microphone pointing upwards at roughly head height when sat in the normal listening position.
It is not necessary to point the microphone directly at the speaker generating the test tone, the microphone should be
pointing vertically towards the ceiling. (It helps if you can position the microphone exactly where your head would
normally be for listening, with the microphone in direct unobstructed view of all speakers.)
• If your system includes an active subwoofer, start by setting its output level/gain control to a value roughly matching
the front speakers.
When activated, a calibration tone is played through each channel of the Receiver in turn, including the subwoofer channel.
The calibration tone cycles round each speaker multiple times as the different parameters are calculated. Follow the ‘progress’
information on your PC/ MAC.
By default, Room EQ is not applied to any of the source inputs. You should enable Room EQ on inputs you think benefit
from this feature, as required, by listening when playing typical source material through each input. After being calculated, this
is enabled from within the Source Setup menu per input source, or on-the-fly in the Audio menu from the Main Menu. See the
“Room EQ” section in SOURCE SETUP
While room equalization can help to reduce problems with listening room acoustics, it is usually far better to try to solve these
problems with the room directly. Proper loudspeaker positioning, acoustic wall treatments and moving the listening position
away from walls should produce far better results overall. However it may be difficult to do this in a home environment, so
Room EQ is your next best choice.
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