miniDSP Ltd, Hong Kong /
www.minidsp.com
/ Features and specifications subject to change without prior notice
20
5.2
P
REPARING FOR ACOUSTIC MEASUREMENT
5.2.1
Connections and microphone placement
The figure below shows a typical connection diagram for performing acoustic measurement. No changes to the
audio connections are needed. Simply:
•
Connect the supplied USB (type A to type B) cable from the
DDRC-88D
to a USB port on the computer.
•
Connect a USB cable (type A to mini type B) from the UMIK-1 to a USB port on the computer.
Place the UMIK-1 microphone into a microphone stand and position the computer and cabling so that there is
enough freedom of movement to move the microphone into the needed locations. A small tripod stand is
supplied with the UMIK-1, but a larger stand with boom arm can be used if desired. If necessary a longer USB
cable can be used (up to a total USB cable length of 5 meters). In larger spaces, an active USB repeater may be
needed. We recommend that the microphone be oriented vertically (pointed at the flo
or or ceiling) and the “90
degree” calibration file used (see
Mic Config tab
on page 23).
5.2.2
Subwoofer settings
We recommend that during calibration the low pass filter of the subwoofer be disabled if possible, or set to its
highest frequency if it cannot be disabled. Any EQ on the subwoofer should be disabled or set “flat.” High pass
filters used to protect the driver from over-excursion should be left in place.
If the subwoofer’s low pass filter is an important part of the overall bass management in the system, it can be
re-enabled after completing Dirac Live calibration and loading correction filters into the
DDRC-88D
.
