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Sundown Audio U-6.5SW D4 6.5" (U65SWD4)

1000W Peak (500W RMS) 6.5" U Series Dual 4-ohm Car Subwoofer (SW-UV16.5D4)

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• Peak Power: 1000 watts
• RMS Power: 500 watts
• Impedance: Dual 4 ohm
• Pressed Paper Cone
• Double-Stitched Surround
• Mount depth: 5.71"
• Sensitivity: 78.14 dB

Learn more about the uv165d4
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List price $239.99
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$199.99

 with warranty
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Get a Free roll of Belva 16 Gauge Speaker Wire. Simply click the "Add Both to Cart" button and you will see your savings at checkout. This offer cannot be combined with any other coupons or offers.

Sundown Audio U-6.5SW D4 6.5" (U65SWD4)

100% off


Priced separately $212 98

Promo Savings of $12 99

Total price:

$199 99

Description


Sundown Audio brand icon

Authorized dealer


Sundown Audio U-6.5SW D4

Perfect for high-power underseat enclosures and designed to be at home in the competition lanes or playing your favorite tunes, the U Series is the premier “standard suspension” woofer in the Sundown lineup. A double-stacked 9” wide ferrite magnet system is coupled to a thick top plate. A thick set of shorting rings are also used inside the magnets and on the pole cap, smoothing out frequency response while doubling as a heat sink and airflow guide. An all-new, substantially thicker custom aluminum frame was designed specifically for the U Series, and equipped with heat-dissipation ribs. The motor also features an extended pole piece to keep the coil controlled under high stress!


Product Details:

  • 6.5" Dual 4 ohm U Series Subwoofer
  • Power Handling:
    • Peak: 1000 watts
    • RMS: 500 watts
  • Pressed Paper Cone
  • Double-Stitched Surround
  • Optimized for small ported enclosures
  • Heavy-duty cast basket for added durability
  • Spring-loaded terminals accept up to 8-gauge wire
  • Stitched-on heavy-duty tinsel leads for easy connection
  • Solid pole with vent channels and aluminum shorting ring cap
  • Rear gap-venting and top cooling channels
  • 1.75" High Temperature Copper Voice coil
  • Aluminum voice coil former for superior heat dissipation
  • 19 mm Xmax
  • Double Stacked magnet motor structure
  • Bolt-through motor design to ensure maximum longevity
  • Resonance Frequency (Fs): 38.6925 Hz
  • Sensitivity: 78.14 dB
  • Recommended sealed box volume: 0.125 cubic feet - 0.2 cubic feet
  • Recommended ported box volume: 0.25 cubic feet - 0.35 cubic feet
  • Top-mount depth: 5.71"
  • Cutout diameter: 5.94"
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

  • Priced Individually

Subwoofer Wiring Guide


Wiring Guide to Wire 1 Sundown Audio U-6.5SW D4 6.5" (U65SWD4) Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Sundown Audio U-6.5SW D4 6.5" (U65SWD4) Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

Wiring Guide to Wire 3 Sundown Audio U-6.5SW D4 6.5" (U65SWD4) Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Sundown Audio U-6.5SW D4 6.5" (U65SWD4) Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp


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Specifications & Details


Subwoofer Specifications
Series
U Series
Subwoofer Size
6.5"
Peak Power Handling
1000 watts
RMS Power Handling
500 watts
Voice Coil(s)
Dual
Impedance (Per Voice Coil)
4 ohm
Voice Coil Material
Copper
Voice Coil Diameter
1.75"
Sensitivity
78.14 dB
Xmax (millimeters)
19 mm
Subwoofer Design
Round / Circle
Main Cone Color
Black
Woofer Composition
Pressed Paper
Woofer Surround
Double-Stitched
Magnet Structure
Double Stacked
Subwoofer Grille
No
Re-Cone Kit Available
No
CTA-2031 Compliant
No
Recommended Enclosure Specifications
Recommended Enclosure Type
Ported / Vented
Sealed
Minimum Sealed Box Volume
0.125 cubic feet
Maximum Sealed Box Volume
0.2 cubic feet
Minimum Ported Box Volume
0.25 cubic feet
Maximum Ported Box Volume
0.35 cubic feet
Top-Mount Depth (Mounting Depth)
5.71"
Cutout Diameter
5.94"
Shallow Mount Installation
No
T/S Parameters (Electromechanical)
Free-Air Resonance (Fs)
38.6925 Hz
Equivalent Compliance (Vas)
3.7701 liters
Total Speaker Q Value (Qts)
0.4681
Electrical Q Value (Qes)
0.5005
Electrical Resistance of Voice Coil (Re)
6.6274 ohm
Mechanical Q Value (Qms)
7.2470
What is in the box?
WITB: Subwoofers
Subwoofer
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

SW-UV16.5D4

Weight:

16.00lbs

Internal SKU:

uv165d4

Internal Product ID:

206535

Customer Ratings & Reviews


Sundown Audio U-6.5SW D4 6.5

5 star
100%
4 star
0%
3 star
0%
2 star
0%
1 star
0%



Durability
5
Value
5
Features
5
Design
5
Usability
5

Customer Photos & Videos


Customer Reviews

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Massive lil 6.5.

This thing looks like a beast very big for a 6.5. Can't wait to try it.

By Jason on October 26, 2025 Checkmark Icon Verified purchase

4 found this helpful


By Luis on January 29, 2026 Checkmark Icon Verified purchase


Impressive “little” subwoofers

Definitely gets you bass in a small space, that’s for sure. Typical sundown quality so no worries there. Built really well. Can’t wait to get them playing in my nephews truck.

By Greg on August 31, 2025 Checkmark Icon Verified purchase




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