Full range unit with unknown details. I was able to make a sound. Both units are marked “R” on the back and have recessed edges. The exterior is dull (Hiura Katsutsugu)
Maintenance information:2022.10.22 Sound output confirmed
Accessories: none
Main specifications: 4Ω 15W W118 x H118 mm Screw pitch approx. 117 mm Weight 934 g