CLIOwin 7 PCI User's Manual - Audiomatica

13.7 THIELE & SMALL PARAMETERS
13.7.1 INTRODUCTION
CLIO handles Thiele and Small Parameters, hereafter referred to as T&S, as a post
process of impedance measurements. Three options are available for source data,
selected by the Data Origin Drop Down Control: Sinusoidal Impedance Data, MLS
Impedance Data, File Data, the last created with either of the previous. There are no
conceptual differences between File and the first two options, beside where the data
resides. Choosing Sinusoidal or MLS, the user should have one of these measurements
in memory while the File Data option will prompt for file selection. Impedance
measurements are therefore the central topic and the previous paragraphs are an
essential background. To get the full set of T&S, two impedance curves are needed. The
first is the loudspeaker’s free air impedance, the second, the impedance obtained either
with Delta Mass or Delta Compliance method. The first consists in adding a suitable
Known Mass to the Loudspeaker cone, the latter in loading the cone with a box of Known
Volume.
13.7.2 T&S PARAMETERS CONTROL PANEL
The User Interface is quite simple with three Buttons, one Drop Down and one Check
Box.
Starts a T&S Parameters procedure. See 13.7.3 for details.
Delta Mass T&S Parameters calculation. See 13.7.3 for details.
Delta Compliance T&S Parameters calculation. See 13.7.3 for details.
The Drop Down allows selecting the data origin as described in the introduction. The LSE
Check Box, when checked, enables a Least Square Error routine while calculating T&S
Parameters; more on this later. Besides information regarding the device tested, the
Control Panel displays 27 parameters. Here is what they are.
168 Chapter 13 - Measuring impedance and T&S parameters