SEAS designed and manufactured its first coaxial drivers in the late 80s.
Early on, R&D engineer Bjørn Børja recognized the unique possibilities created by the new neodymium magnet technologies; allowing us to design a high performance tweeter in a very compact package. SEAS has continuously refined coaxial driver technology over the years, and today remains the only loudspeaker driver manufacturer to make this unique technology available to the OEM and hobbyist markets.
| Item | 16cm coax | VC diam | Fo | VAS | QTS | Features |
| E0051-04/06 | C16N001/F | 39 mm | 37 Hz | 15 | 0.49 | Magnesium cone, double chamber tweeter |
| E0080-04/06 | C16NX001/F | 39 mm | 35 Hz | 16 | 0.31 | Graphene Magnesium cone, double chamber tweeter |
| E0121-04/06 | C16NX001/X | 39 mm | 38 Hz | 18 | 0.29 | Metamodal™ TPCD cone and dome, FEA optimised magnet systems |
| Item | 18cm coax | VC diam | Fo | VAS | QTS | Features |
| E0060-08/06 | C18EN002/A | 39 mm | 85 Hz | 5 | 0.54 | Dedicated midrange, aluminium/magnesium cone and tweeter dome |