PRELIMINARY
miniDSP Ltd, Hong Kong /
www.minidsp.com
/ Features and specifications subject to change without prior notice
43
5.6
R
UNNING THE MEASUREMENTS
Acoustic measurements are performed on the
Measurements
tab.
5.6.1
Select listening environment
The
Measurements
tab presents three different listening environments as a visual guide to positioning the
microphone for each of the nine measurements:
Chair
, for a single listening seat;
Sofa
, for multiple listening
seats; and
Auditorium
, which is intended for a large venue. Use the icons at the left of the screen to select the
listening environment.
The center of the screen contains a pictorial representation of the selected listening environment, with dots
marking the recommended microphone locations. Completed measurements are shown in green, while the next
measurement to be done is highlighted in yellow and has a red arrow marker pointing to it. A drop-down menu
underneath selects three different views, which should be used to help you place the microphone in a suitable
location. (See summary diagram on next page.)
5.6.2
About measurement locations
While the visual guide indicates a suitable set of microphone locations, these locations can be varied to suit
individual circumstances. It is, however, imperative that the first measurement is taken in the center of the
listening area, as this measurement is used to set the levels and delays of each channel. The subsequent eight
measurements should be well spread so that Dirac Live can acquire a good set of. Placing all microphone
locations too close to each other may result in “over
-
correction” that will sound dry and dull.
For example, if using the
Chair
listening environment, spread the microphone positions over a circle with a
diameter of a meter (three feet). Vary the height of the microphone up and down by 30 cm (one foot) from the
