21" Supercharged Subwoofers! DD9921 5000Wrms monsters

Wow, a first for the UK! My customer has agreed for me to give you some demo footage of these beauties being broken in and playing some test tracks. These are the biggest and meanest ferrite-motor woofers that DD have to offer, with the 9900 motor, 4“ 4-layer reinforced coil, gloss composite cone and cap, supercharge option, and we fitted these out with the soft spider option for higher efficiency and a lower Fs, since they will be used on lower power and in a smaller enclosure. I cant wait to see what these are capable of. You will hear chuffing as these play in free air due to the cooling vents on the rear of the motor. This completely disappears when mounted.