User`s manual

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.
192 13 MEASURING IMPEDANCE AND T&S PARAMETERS