4530BK made by Shinkosha. Since there are many chips and scratches throughout, it is inexpensive. The D130 was mounted. Woofer with MA15 fastener! Powerful bass reproduction far exceeding size is possible with the rear loading horn type enclosure (Sasaki Shota)
Accessories: MA15
Main specifications: screw pitch 420 mm hole diameter 360 mm plate thickness 40 mm front baffle plate thickness 22 mm W600 x H1250 x D600 mm 56.3 kg (all measured)