Running The Measurements; Listening Environment - miniDSP DDRC-24 User Manual

Ultra-compact 2-in 4-out audio processor with dirac live room correction technology

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5.4 R

UNNING THE MEASUREMENTS

Measurements are performed on the Measurements tab.

Measurements should be performed under good conditions. While the measurement technique used by Dirac

Live is quite robust, low-frequency noise (traffic, machinery, aircraft, storms) in particular can adversely affect

measurement accuracy. A high level of ambient noise can degrade signal to noise ratio and prevent the

algorithm from analyzing the test sweep signal properly. Minimize the effect of any external noise, ensure that

measurement signal levels are adequate, and/or choose a suitable time for performing measurements.

The Dirac Live Calibration Tool Stereo for miniDSP presents two different listening environments as a visual

guide to positioning the microphone for each measurement: Chair, for a single listening seat, and Sofa, for

multiple listening seats. Select a listening environment by clicking on the chosen icon.

The pictorial representation of the selected listening environment has a set of dots marking the microphone

locations. Completed measurements are green, while the next measurement to be done is 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 the correct location.

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 out over the entire listening area so that Dirac Live can acquire a good set

of measurements that capture the acoustic behavior of the room. 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 area, spread the microphone positions over a circle with a diameter of

at least a meter (three feet) and vary the microphone height from the central position by at least 30 cm (one

foot) up and down. If using the Sofa listening environment, spread the measurement locations over the full

listening area and vary the height up and down by at least 30 cm (one foot). The important thing is to ensure

that the measurement locations are spread out over the whole listening area and that the microphone is moved

a sufficient distance vertically as well as horizontally.

miniDSP Ltd, Hong Kong /

www.minidsp.com

/ Features and specifications subject to change without prior notice

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