User manual

PRELIMINARY
miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 16
3 ACOUSTIC MEASUREMENT
The Dirac Live Calibration Tool For miniDSP uses a set of measurements made in your listening room to
calculate correction filters for all speaker channels. The measurements are made using the NanoAVR DL HDMI
audio processor and the supplied UMIK-1 measurement microphone. No additional hardware or connectivity is
required.
3.1 LOUDSPEAKER AND MICROPHONE POSITIONING
Prior to performing acoustic measurements, loudspeaker and subwoofer positioning should be optimized. In
particular, the location of the subwoofer within the room will have a large impact on the smoothness of bass
response. With Dirac Live®, you have more freedom with loudspeaker and subwoofer placement, but the best
result will still be achieved if optimal placement is used together with Dirac Live®.
A total of nine measurements must be taken, with the microphone located in different positions in the room
and pointed vertically. The first measurement must be taken at the central location of the listening area, as this
location sets the levels and delays of each speaker. Eight more measurements are then taken at locations spread
around the listening room and at different heights from the floor.