12W7AE-3
12-inch (300 mm) Subwoofer Driver, 3 Ω

12W6v3-D4
12-inch (300 mm) Subwoofer Driver, Dual 4 Ω

13TW5v2-2
13.5-inch (345 mm) Subwoofer Driver, 2 Ω

12TW3-D4
12-inch (300 mm) Subwoofer Driver, Dual 4 Ω