The SM31-EZ-T is a premium full range 3 inch surface mount speaker, with overall dimensions smaller than a 4inch sphere. The speaker incorporates a theft and corrosion resistant mounting mechanism with indexed swivel joint for complete hemispherical aiming. SM31-EZ-T speaker components have been weatherized for indoor and outdoor applications. The SM31-EZ-T is an 8ohm speaker with the the AC-SM31-XFMR transformer module to add a 20W transformer and 5 position tap switch that mounts into a single gang deep junction box.