This is a Bowers and Wilkins 10 inch subwoofer. It works perfectly but has a couple of minor scratches which don't affect performance or looks for that matter unless you look up close. Here is a link to a comparable sub on the B & W website selling for
$2,900 : https://www.bowerswilkins.com/en-us/product/subwoofers/db-series/db4s/150211.html. This is part of a whole entertainment system with tower speakers, center speaker, sub and receiver so let me know if you want it all