IRC, another sealed midrange was the University CM 8. A long time ago I had a homemade 3 way system using Lafayette 12" woofers, that previously mentioned midrange and a horn tweeter which also came from Lafayette. Forgot its dimensions. Moved from them to my present 416a 511b 802d/ 80* used today. But even before that had some cobbled out of old radio consoles of a wide variety, then to "Mustang" full range made by Utah if I've got that right as well. Even had one Jensen 12" field coil that came from an ole juke box. Played louder than stimk with a 10 watt Bell amplifier. Then one day, the powwer supply failed when the sealing wax or tar melted out of the transformer staining the hardwood floor in the bedroom and filling the same with smoke.