Visaton FR 58, 5.8 cm (2.3" ) fullrange 8 Ohms speaker with Coated paper cone, rubber surround, squared metal basket with 4 mounting holes and rubber gasket. 5.2 x 0.5 mm (+) and 2.8 x 0.5 mm (-) Contact pins. Very linear and wide frequency response and low resonant frequency provide a wide range of applications, including Hi-Fi