*Currently on sale. Details such as the manufacturer and model number of the unspecified full-range unit pair are unknown, but I was able to sweep and make a sound. The exterior is dull and covered with corn paper after repair (Katsutsugu Hiura)
Maintenance information:2023.2.5 sound output confirmed
Accessories: none
Main specifications: W105 x H105 x D46 mm (actual measurement) screw pitch (diagonal) 115 mm weight 661 g