JBL 4345 DIY. This Woofer Size is 18inchi(46cm).

JBL 4345 Kenrick Sound All Alnico Beryllium Vesion. 

https://youtube.com/results?sp=mAEA&search_query=jbl4345+kenricksound+%E3%82%AA%E3%83%BC%E3%83%AB%E3%82%A2%E3%83%AB%E3%83%8B%E3%82%B3 

https://youtube.com/results?sp=mAEA&search_query=jbl4345+kenricksound+%E3%82%AA%E3%83%BC%E3%83%AB%E3%82%A2%E3%83%AB%E3%83%8B%E3%82%B3