Meyer Sound SIM 3 User's Guide download pdf (Page 157)

151

CHAPTER 7

Using SIM 3

Figure 7.27. Frequency Response trace showing comb filtering

7.6. MOVING BETWEEN MEASUREMENTS

7.6.1. Overview

SIM 3 allows the user to move through a variety of different measurements in the process of

optimizing a sound reinforcement system. Combining Branches with the ability to analyze a

section or the complete console-to-listener path provides the experienced SIM 3 user with a

comprehensive tool set to make the sound system the best it can be for all of the audience.

7.6.2. Same Data, Different Measurements

SIM 3 allows the same basic data and measurement points to be viewed from different

perspectives. A spectrum measurement can show what frequencies at what level are present

at each of the three measurement points. A third-octave measurement provides the basic

information, which can be seen in more detail in a line spectrum measurement.

Delay Finder uses the inverse of the FFT differencing between any two measurement points

to accurately show any delay times introduced through circuitry or via the physical distance

between loudspeakers and the measurement microphones. Finally, the frequency and phase

responses can be determined and compared.

7.6.3. Basic Measurement Methodology

Brieﬂy, SIM 3 measurements follow a certain order to achieve the best results. Going through

the entire sound reinforcement system methodically will give the user the ability to determine

the levels and frequency content of the audio at all of the measured listening points within

the venue, and correct any problems with loudspeaker placement and aiming, architectural

treatment, delay, and equalization.

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Meyer Sound SIM 3 User's Guide Page 157