AVProAlliance AViMUX4 Manuel d'utilisation et d'application - Page 14

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APPLICATION

Introduction

The AVProAlliance.com iMUX4 allows an analyzer to average sound from multiple

microphones in a room, providing a single RTA or FFT test display. When sound is time

averaged from multiple microphones, measuring different positions in the room, the resulting test

display is called "spatially averaged." Spatial averaging indicates the average response of the

room across the entire seating or listening area rather than from a single point in the room. This

is ideal for low frequency measurements where point to point variability introduces a high degree

of uncertainty. A spatially averaged measurement is considered the most accurate representation

of the true low frequency response of a room and is essential for accurate calibration.

Measurement Setup

To use the iMUX4 and SSD AudioTools to measure a room's spatially-averaged frequency

response, use the setup illustrated in Figure 5. Run cables from the microphones to the respective

MIC IN jacks of the iMUX4. Connect the cable from the iAI2 to the iMUX4 and connect the

iPad connector from the iAI2 to the iPad as shown below. The iMUX4 case facilities these

connections for maximum efficiency on the jobsite.

The iMUX4 case allows for the deployment and storage of microphones fully connected. This

means that the process of setting up is greatly expedited and simplified. The only connection

necessary will be attaching the iPad to the iAI2 using its connector. Due to the short length of

the iAI2 connector it's recommended that you place the iPad on top of the iMUX4 case for use.

The long high quality microphone cables allow easy reach of most locations in the room.

Multiple Mics

iMUX4

MICROPHONE MULTIPLEXER

MIC

MIC 1

1-4

Room

MICROPHONE

SELECTION

Figure 10. Typical setup for analyzing a room with the iMUX4 & iPad with iAI2