Are you a driver OEM looking to publish accurate Thiele-Small parameters for your drivers that loudspeaker designers can rely on? (We think that would really pay off, given the number of reputed OEMs who either do not have sufficient published specs or who publish specs that are terribly inconsistent.) Or do you want to move beyond the standard Thiele-Small model and build a more realistic and accurate driver model that designers will thank you for?

Are you a DIYer or audiophile who has invested money in an expensive but ill-specified driver and want to verify or re-measure the driver parameters?

For starters, we accurately measure the following Thiele-Small parameters. We use multiple methods for measurement of most parameters to minimize measurement errors. (Note that we run in the driver for a period of 24 hours.)

Fs	Free-air resonant frequency
Re	DC resistance of voice coil
Res	Equivalent resistance representing mechanical losses
Le	Voice coil inductance at 1Khz
Qms	Mechanical Q
Qes	Electrical Q
Qts	Total Q
Vas	Volume of air having the same acoustic compliance as driver suspension
Cms	Driver mechanical compliance
BL	Motor strength
Sd	Effective cone area
Mms	Cone mass

Of course, also included is an accurate measurement of the free-air impedance characteristic of the driver used for parameter determination, which you may import into any other software package.

For your more elaborate modeling needs, you may wish to consider, for example, the model used by MLSSA (see the Speaker Parameter Option Reference Manual on the MLSSA website) , very similar to the one used by the freeware Speaker Workshop. Or at more sophisticated models such as those of LEAP that work with small as well as large drive levels. We can help you derive a model similar to MLSSA/Speaker Workshop, and/or move into the large-signal realm by generating impedance curves at small and large drive levels that can be used to generate a LEAP LTD transducer model that is extremely accurate.

For OEMs, we recommend shipping a sample of your driver to us. For DIYers, we have a jig which you can purchase for use with Speaker Workshop and make accurate measurements yourself.