Ring radiator teater from Denmark Vifa. It looks like a scan peak, and its bright, loud sound is attractive. There are some scratches on the frame and solder marks on the terminals (Yoichi Murakoshi)
Maintenance information: 2021.6.12 sound confirmed
Accessories: none
Main specifications: 4Ω 2500 to 30,000 Hz 90dB diameter 105mm