Sundown Audio U18 v.2 18" 2000W RMS Subwoofer DVC

• 2000 Watts RMS / 4000 Watts Peak
• Dual 2 or 4 ohm voice coils
• Optimized for small ported or bandpass enclosures
• Aluminum 3” voice coil former for superior heat dissipation
• High-temperature copper voice coil
• Double stitched surround
• Heavy-duty cast basket
• Spring-loaded terminals accept up to 8-gauge wire
• Stitched-on heavy-duty tinsel leads
• Solid pole with vent channels and aluminum shorting ring cap
• Rear gap-venting
• Top-Plate Cooling Channels

Designed to be at home in the competition lanes or playing your favorite music, the U Series is the premier “standard suspension” woofer in the Sundown lineup. A double-stacked 9.4-inch wide ferrite magnet system is coupled to a thick top plate. A thick set of shorting rings are used inside the magnets and on the pole cap, smoothing out frequency response while doubling as a heat sink and airflow guide. A custom aluminum frame was designed specifically for the U Series. It’s substantially thicker and equipped with heat dissipation ribs at the bottom of the frame. The U v.2 motor also features an extended pole piece to keep the coil under perfect control under high stress. The coil temperature is controlled with machined, high-velocity pole channels and a series of 16 direct air-gap vents in the back plate.

Specifications

Specification	D2 Model	D4 Model
RMS Power	2000 W	2000 W
Peak Power	4000 W	4000 W
Displacement	.26cu ft	.26cu ft
Mounting Depth	10"	10"
Outside Diameter	18.63"	18.63"
Cutout Diameter	16.9"	16.9"
Motor Diameter	9.7"	9.7"
Sealed Enclosure	3.0cu ft	3.0cu ft
Ported Enclosure	4.0cu ft	4.0cu ft
Recommended Port Tuning	35hz	35hz
Recommended Port Area	64sq in	64sq in
Xmax	30mm	30mm
4th Order Sealed	2.25cu ft	2.25cu ft
4th Order Ported	6.75cu ft	6.75cu ft
4th Order Port Area	135sq in	135sq in
4th Order Port Length	6"	6"