“Vivid Audio's new lower midrange driver as used in the Giya G1 Spirit. C125-75 has a huge 75mm voice coil attached to a 125mm alloy/carbon diaphragm. The magnet is open at the back to allow rear sound to leave unimpeded and to be absorbed by the exponentially tapered tube. Like the Nautilus midrange but way more advanced.” 

“This driver is the prototype driver. Its more like the original Nautilus drivers. The voice coil is so big it allows for a thinner pole piece. And its much lighter in weight too.” - Jake Purches