Sundown Audio U 6.5" D2 Subwoofer | 400 Watts RMS

Sundown Audio U 6.5" D2 Subwoofer | 400 Watts RMS

Elevate your audio experience with the Sundown Audio U 6.5" D2 Subwoofer, delivering an impressive 400 watts RMS of deep, precise bass. Designed for high-power underseat enclosures, this compact subwoofer is optimized for small ported enclosures, making it an ideal choice for both competition setups and everyday driving. As part of Sundown’s premier “standard suspension” U Series, the U 6.5" D2 stands out with its power, precision, and durability.

Unmatched Performance and Durability

Equipped with dual 2-ohm voice coils, the U 6.5" D2 offers flexibility in wiring configurations, ensuring you get the most out of your audio system. Its 1.75” aluminum voice coil former is designed for superior heat dissipation, paired with a high-temperature copper voice coil that handles intense power levels with ease. The heavy-duty cast basket and double-stitched surround provide the durability needed for high-performance audio environments.

Advanced Cooling for Peak Performance

Sundown Audio's U 6.5" D2 Subwoofer is engineered with top-tier cooling technology to maintain optimal performance during extended use. The solid pole with vent channels and aluminum shorting ring cap reduces inductive distortion, while the rear gap-venting and top-plate cooling channels ensure consistent operation even under high stress. These features work together to keep the subwoofer cool and performing at its best.

Versatile Design for Any Setup

Whether you’re setting up for a competition or enhancing your daily drive, the U Series subwoofers deliver exceptional performance. The double-stacked 9” wide ferrite magnet system, coupled with a thick top plate, enhances overall performance. The inclusion of shorting rings inside the magnets and on the pole cap improves frequency response and doubles as a heat sink and airflow guide. The custom-designed, thicker aluminum frame with heat-dissipation ribs ensures the U 6.5" D2 remains cool and controlled, even during intense use.

Key Features

• Power Handling: 400 Watts RMS for deep, impactful bass
• Voice Coil: Dual 2 Ohm for flexible wiring options
• Enclosure Compatibility: Optimized for small ported enclosures
• Cooling: Rear gap-venting and top-plate cooling channels for consistent performance
• Construction: Heavy-duty cast basket with double-stitched surround
• Connectivity: Spring-loaded terminals accepting up to 8-gauge wire
• Design: Ideal for both competition setups and high-performance daily driving

Technical Specifications

• T/S Specs (D2 Version):
  • RE (Ohms): 4.0586
  • FS (Hz): 41.9533
  • VAS (L): 2.9053
  • Qes: 0.5238
  • Qms: 8.5834
  • Qts: 0.4937
  • Le (mH): 4.0112
  • BL (NA): 16.7428
  • Mms (Grams): 137.2546
  • Cms (uM/N): 104.8528
  • Sensitivity (dB @ 1w/1m): 77.8706 dB

Sundown Audio U 6.5" Dimensions

Enclosure Recommendations

• Sealed Enclosure: 0.125-0.2 cu. ft. net
• Ported Enclosure: 0.25-0.35 cu. ft. net
• Recommended Tuning: 35Hz - 40Hz
• Recommended Port Area: 4-5 sq. in.
• Displacement: 0.04 cu. ft.
• Physical Dimensions:
  • Depth: 5.71"
  • Outside Diameter: 7.17"
  • Cut-Out Diameter: 5.94"

Upgrade your sound system with the Sundown Audio U 6.5" D2 Subwoofer and experience unmatched bass performance. Whether you’re on the competition circuit or just cruising to your favorite tunes, the U Series delivers powerful, distortion-free sound every time.