Specifications

4.5 IN-ROOM MEASUREMENTS
We are going to execute two acoustical FFT measurements that characterize the
quality of perceived sound and the room environment surrounding us.
Both measurements are done at a listening position; the first tells us about the
overall tonal balance and is done with third-octave RTA analysis; the second aims to
give us an idea of room behavior with respect to decay of sound.
Unlike Log Chirp measurements, FFT and RTA are interactive; the user can chose
either to generate a particular stimulus signal or simply analyze what is present at
the mic input. When possible, when using a stimulus, it is advisable to use CLIO's
internally generated signals because they lead to more precise and powerful
analyses. Here we describe two examples exploiting both methods.
Let's prepare for our RTA measurement with an example. As seen in the photo
above, we have placed a Rogers-like loudspeaker in our listening room for
measuring.
To measure a loudspeaker in a similar situation, place the microphone at a listening
position and connect the mic. cable to the CLIO input. Set the Mic Power Supply to
ON ; In-Out Loop to open (i.e. button released); Input Sensitivity to -20dBV.
Set CLIO's Output Level starting low, say 0.1V, and the CLIO generator to OFF .
With the power amplifier turned OFF, and the volume control to minimum, connect
the CLIO output to the power amplifier line input and then you may turn the power
amplifier on.
Press the FFT button, then enter FFT Options and set Size to 65536, Units to
dBSPL and check the RTA box.
48 4 ENJOY CLIO POCKET CLIO POCKET - SURVIVAL GUIDE