User`s manual

Table Of Contents
10.4.3 ACOUSTIC FREQUENCY RESPONSE
Up till now we measured using CLIO and simple cables. Now we are going to deal
with acoustic measurements. The time domain will be an essential part of our
interest. Furthermore we need to add two external devices, a microphone and a
power amplifier. Connections are shown in Fig.10.10.
INPUT (A OR B)
OUTPUT (A OR B)
CLIO
POWER AMPLIFIER
RED
BLACK
BLACK
RED
MIC-01 OR MIC-02
Figure 10.10
Please note that the connections from the amplifier to the speaker are inverting
polarity. This is on the assumption that the amplifier is non-inverting, most are so,
and you are using Audiomatica Mic-01 or Mic-02, which does invert polarity. Most
Measuring Grade Microphones also invert polarity. Remember that inverting polarity
does not change the frequency response, however it does change phase response.
Fig.10.11 shows how we placed the microphone with respect to the speaker and
also with respect to the floor.
122 10 MLS & LOG CHIRP