Description: The U Series woofer from Sundown is incredibly versatile, thriving in both competition setups and your daily driver. It features a double-stacked 9” wide ferrite magnet system and a robust top plate. It also incorporates shorting rings within the magnets and pole cap to enhance frequency response, act as a heat sink, and guide airflow. The U Series is equipped with a significantly thicker custom aluminum frame that boasts heat-dissipation ribs. The v.2 motor also includes an extended pole piece to ensure the coil remains controlled even under high stress! Features: 750W Watts RMS / 1500 Watts Peak Dual 2 ohm Optimized for small ported enclosures Aluminum 2.25” 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 Specifications: RE (Ohms): 3.8 FS (Hz): 39.387 VAS (L): 6.345 Qes: 0.412 Qms: 2.474 Qts: 0.353 BL (NA): 20 Mms (Grams): 175.34 Cms (uM/N): 93.125 Sens (dB @ 1w/1m): 81.6 Xmax: 18mm Subwoofer Measurements: Displacement (Inches): .09 cu ft Depth (Inches): 6.02" Cutout (Inches): 7.375" Motor Diameter (Inches): 6.88" Ported Enclosure Specs: Ported Enclosure Size: 0.65 cu ft Recommended Port Area: 9 sq in Recommended Port Tuning: 35 hz Sealed Enclosure Specs: Sealed Enclosure Size: 0.3 cu ft 4th Order Enclosure Specs: 4th Order Sealed Side: .225cu ft 4th Order Ported Side: .675cu ft 4th Order Port Area: 14sq in 4th Order Port Length: 6"
