Description
Sundown Audio UV.2 18 D4
The Sundown Audio UV.2 18 D4 is an 18-inch shallow-mount subwoofer from the UV Series v.2 lineup, engineered to deliver massive, deep bass in compact or limited-depth installations. Featuring a dual 4-ohm (D4) voice coil, it provides flexible wiring options for various amplifier setups. Built with a high-temperature copper voice coil, reinforced cone, and durable foam surround, the UV.2 18 D4 ensures tight, controlled low-frequency performance and long-term reliability. Optimized for sealed enclosures, this subwoofer is ideal for trucks, vans, and vehicles with limited space that require powerful, precise bass.
Specifications
| RE (Ohms) | 3.8710 | 6.0767 |
| FS (Hz) | 30.9541 | 30.9212 |
| VAS (L) | 111.7625 | 114.6901 |
| Qes | 0.5669 | 0.6572 |
| Qms | 5.6396 | 5.5116 |
| Qts | 0.5151 | 0.5872 |
| Le (mH) | 3.3981 | 4.7475 |
| BL (NA) | 27.4023 | 31.4938 |
| Mms (Grams) | 565.4130 | 552.1551 |
| Cms (uM/N) | 46.7560 | 47.9807 |
| Sens (dB @ 1w/1m) | 89.4169 | 88.8733 |
| Xmax | 30mm | 30mm |
| T/S SPECS | UV.2 18″ D2 | UV.2 18″ D4 |
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Enclosure Specifications
| Sealed Enclosure | 3.0 cu ft |
| Ported Enclosure | 4.0 cu ft |
| Recommended Tuning | 35Hz |
| Recommended Port Area | 64 sq in |
| Displacement | 0.26 cu ft |
| Depth | 10″ |
| Outside Diameter | 18.63″ |
| Cut-Out | 16.9″ |
About The Product
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.
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