Visaton W130S, 146mm (5.75in / 5-3/4in) Paper Cone Mid-Bass, with 25mm Voice Coil, #9023, 8ohm.
15 cm (5.75") HiFi low-midrange driver with coated paper cone, elastic rubber surround and 25 mm voice-coil.
Suitable as woofer and due to the very balanced frequency response also as low-midrange driver especially in large 3-way speaker systems.