User manual

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and speci fi cations subject to change without prior noti ce 16
3 ACOUSTIC MEASUREMENT
The Dirac Live Calibration Tool For miniDSP uses a set of measurements made in your listening room to gather
all the acoustical information about your room and speakers that it needs to calculate the correction filters. The
measurements are made using the nanoAVR DL HDMI audio processor and a miniDSP UMIK-1 measurement
microphone (must be purchased separately).
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 are needed, with the microphone located in different positions in the room and
pointed vertically (that is, at the floor or ceiling). 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 area and at different heights from the floor.