sanzha.shabdarov asked if there are SPICE models for loudspeakers.

There are.

One of the things that you saw when you joined this group (but probably did not pay attention to), is the fact that the group has a sizable Files area with models that have been collected over more than 15 years. The "Table of Contents" file (all_files.htm) is your best index into those files, but it's not a perfect index.

Download that file. Then open it in your web browser. I suggest doing a search for "speaker", but be aware that some of them are different, such as piezoelectric and electrostatic speaker elements. Just check the files and see what you find. Some might be what you're looking for; others not.

Also be aware that loudspeakers come in all shapes and sizes and types. Any one model is good for only one speaker, and it's probably not the one you really wanted. Many models would be for complete loudspeakers with one or more drivers inside an enclosure. The enclosure makes a big difference to portions of the speaker's impedance.

Some good places to search for SPICE models are (a) our group's Files area, (b) a manufacturer's website (esp. for ICs and some transistors), and (c) Google -- e.g., the open Internet. Some judgment is always required, along with willingness to use a similar model when the one you're looking for doesn't exist.

Regards,
Andy