21"carbon sandwich cone glued together with a Tall Roll surround.
Ideal for SPL applications, but also for music listeners.
Because of the sandwich structure, the membrane is extremely stiff, but thanks to the inner foam layer, it is also ideal for musick.
Number of layers: 3
Overall diameter: 395 mm
Voice coil opening : 4" - 101 mm
overall diameter : 520mm
inner diameter : 374mm
height : 25mm