CLIOwin 7 PCI User's Manual - Audiomatica
CLIOwin 7 PCI User's Manual - Audiomatica
CLIOwin 7 PCI User's Manual - Audiomatica
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13.3.1 MEASURING IMPEDANCE OF LOUDSPEAKERS<br />
We will start with a 5" woofer using Sinusoidal, our preferred choice, with the following<br />
Settings.<br />
Besides frequency range, which can be changed without side effects, those above are<br />
problem free settings for impedance measurements. We will experiment a little, pointing<br />
out difficulties that might arise. Let’s start with output level, which is a sensitive topic.<br />
13.3.2 SETTING THE RIGHT LEVEL<br />
The five curves of Fig.13.4 are taken at 5 different output levels, ranging from 10dBu<br />
to -10dBu in 5dB steps. The red curve refers to +10dBu, the blue to +5dBu, the<br />
remaining are substantially overlapped.<br />
25.0<br />
CLIO<br />
180.0<br />
Ohm<br />
Deg<br />
20.0 108.0<br />
15.0 36.0<br />
10.0 -36.0<br />
5.0 -108.0<br />
0.0 -180.0<br />
10 100<br />
Hz<br />
Figure 13.4<br />
It turns out that going from a linear device such as our resistor to loudspeakers makes<br />
Chapter 13 - Measuring impedance and T&S parameters 159
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