User`s manual

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11.4.2 FREQUENCY RESOLUTION
Here the lower the resolution the faster the measuring time. Impedance
measurements are again a powerful way to explore problems. Fig.11.3 shows two
impedance measurements taken from the same 16" woofer with 1/24 octave
resolution (red) and 1/6 octave resolution (black). Deriving T/S Parameters from
the black curve would lead to serious errors. This is an extreme case, a huge
woofer with high Qms. Different curve shapes can sometimes be accurately
quantified even with 1/3 octave resolution.
Audiomatica Srl Sinusoidal 02/07/2001 17.42.36
CH A Ohm Unsmoothed Stepped Delay [ms]: 0.000 Dist Rise [dB]: 30.00 File: big6.sini
10 10010 Hz
150.0
Ohm
180.0
Deg
120.0 108.0
90.0 36.0
60.0 -36.0
30.0 -108.0
0.0 -180.0
CL IO
Figure 11.3
11 SINUSOIDAL 147