GPA (Great Plains Audio) is a manufacturer that took over ALTEC's production facilities and currently maintains ALTEC units. A 1-inch throat driver unit that employs a PASCALITE diaphragm. It is a driver that is also used in the late A7. The PASCALITE structure diaphragm assembly developed in 299 is adopted, and a high-heat-resistant voice coil bobbin of aramid fiber is adopted for the voice coil, for long-term high-power operation It is supported (Oikawa Tetsuji)
Maintenance Information: 2022.5.16 Operation confirmed
Accessories: none
Main specifications: 1 inch driver Frequency characteristic 500Hz to 20kHz Output sound pressure level 108dB Impedance 8Ω External dimensions Diameter 140 ✕ Depth 69mm Weight 2.9kg