This is a pair of 12-inch EM12LSP speaker units from the American company EMINENCE. These are stock items that have been maintained by EMINENCE and have never been installed in an enclosure. They have only been tested for operation and are not yet broken in. They would be a good replacement for EV speakers, etc. The base is thought to be the Electro Voice EVM12L or EVS12SB, or the EM12 from the same company, for guitars, etc., but these are high-performance units that can also be used for Canopus special SR models. A feature is that the center cap of the cone is directly glued to a cap of the same size as the voice coil, with an emphasis on good sound projection. Although the detailed specifications are unknown, please consider them to have the same specifications as the units mentioned above. They are well-made and sound good, and I believe they were stored after maintenance and hardly used. I had them in stock as replacements for Electro Voice speakers, but I am selling them because I have too much equipment and too many units. How about using them for guitar amplifiers or as replacements for 12-inch models from Electro Voice? Thank you.