Nominal diameter

•  4" (100mm) (1)
•  8" (200mm) (1)
•  21" (530mm) (1)

Nominal impedance

•  4 Ohm (2)
•  8 Ohm (12)
•  16 Ohm (1)

Magnet material

•  ferryt / ferrite (1)
•  neodym / neodymium (2)

Voice coil diameter

•  1" (25mm) (1)
•  1,5" (38mm) (2)
•  1,8" (45mm) (2)
•  2" (51mm) (1)
•  2,5" (65mm) (5)
•  3" (75mm) (5)
•  4" (100mm) (4)
•  4,5" (115mm) (2)
•  5,3" (134mm) (1)