10TW1-2
10-inch (250 mm) Subwoofer Driver, 2 Ω

10TW1-4
10-inch (250 mm) Subwoofer Driver, 4 Ω

12TW1-2
12-inch (300 mm) Subwoofer Driver, 2 Ω

12TW1-4
12-inch (300 mm) Subwoofer Driver, 4 Ω