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Sundown Audio X-8 v.4 D4 8" (X8V4D2)

2500W Peak (1250W RMS) 8" X Series Dual 4-ohm Car Subwoofer (SW-XV48D4)

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• Peak Power: 2500 watts
• RMS Power: 1250 watts
• Impedance: Dual 4 ohm
• Pressed Paper Cone
• Pressed Foam Surround
• Mount depth: 7.56"
• Sensitivity: 79.8 dB

Learn more about the xv48d4
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List price $479.99
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$399.99

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Description


Sundown Audio brand icon

Authorized dealer


Sundown Audio X-8 v.4 D4

Designed with an extended pole piece and an incredible four inches of peak-to-peak excursion, the X v.4 is engineered for ultra-deep bass and high power handling. Engineered to set a new standard in the low-frequency/small-ported-box subwoofer category, the X Series can also work in up to a 50% larger enclosure if you desire even more low-end extension.

The X v.4 series differentiates itself with its incredibly linear suspension, ensuring the lowest level of bass extension in a small enclosure while maintaining extremely low levels of distortion. Notably, the v.4 series features a much larger motor structure (220mm vs. 190mm on the v.1 series), improved motor ventilation, and an all-new Mega-Roll v.2 surround, providing a more linear and rugged update to the world-famous Mega-Roll v.1 surround design.


Product Details:

  • 8" Dual 4 ohm X Series Subwoofer
  • Power Handling:
    • Peak: 2500 watts
    • RMS: 1250 watts
  • Pressed Paper Cone
  • Pressed Foam Surround
  • Hyper-extended pole construction
  • Finite Element Analysis (FEA) optimized spider and surround
  • Newly revised version of classic custom-tooled 8" frame
  • Features an aluminum magnet ID shorting ring for reduced distortion
  • Motor and coil are capable of 20 mm of linear x-max one-way
  • 2.5" High Temperature Voice coil
  • 19 mm Xmax
  • Triple Stacked magnet motor structure
  • Resonance Frequency (Fs): 44.15 Hz
  • Sensitivity: 79.8 dB
  • Recommended sealed box volume: 0.3 cubic feet - 0.4 cubic feet
  • Recommended ported box volume: 0.75 cubic feet - 1 cubic feet
  • Top-mount depth: 7.56"
  • Cutout diameter: 7.32"
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

  • Priced Individually

Subwoofer Wiring Guide


Wiring Guide to Wire 1 Sundown Audio X-8 v.4 D4 8" (X8V4D2) Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Sundown Audio X-8 v.4 D4 8" (X8V4D2) 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 X-8 v.4 D4 8" (X8V4D2) Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Sundown Audio X-8 v.4 D4 8" (X8V4D2) Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp


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Specifications & Details


Subwoofer Specifications
Series
X Series
Subwoofer Size
8"
Peak Power Handling
2500 watts
RMS Power Handling
1250 watts
Voice Coil(s)
Dual
Impedance (Per Voice Coil)
4 ohm
Voice Coil Diameter
2.5"
Sensitivity
79.8 dB
Xmax (millimeters)
19 mm
Subwoofer Design
Round / Circle
Main Cone Color
Black
Woofer Composition
Pressed Paper
Woofer Surround
Pressed Foam
Magnet Structure
Triple 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
0.3 cubic feet
Maximum Sealed Box Volume
0.4 cubic feet
Minimum Ported Box Volume
0.75 cubic feet
Maximum Ported Box Volume
1 cubic feet
Top-Mount Depth (Mounting Depth)
7.56"
Cutout Diameter
7.32"
Shallow Mount Installation
No
T/S Parameters (Electromechanical)
Free-Air Resonance (Fs)
44.15 Hz
Equivalent Compliance (Vas)
3.56 liters
Total Speaker Q Value (Qts)
0.41
Electrical Q Value (Qes)
0.5
Electrical Resistance of Voice Coil (Re)
6 ohm
Mechanical Q Value (Qms)
2.3
What is in the box?
Paperwork
User manual
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-XV48D4

Weight:

32.00lbs

Internal SKU:

xv48d4

Internal Product ID:

206547

Customer Ratings & Reviews


Sundown Audio X-8 v.4 D4 8

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



Durability
5
Value
4
Features
5
Design
5
Usability
5

Customer Photos & Videos


Customer Reviews

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By Guillermo on May 22, 2026 Checkmark Icon Verified purchase


By Barrie on March 1, 2026 Checkmark Icon Verified purchase


Amazing sound!!

Wanted to dip into the
lows ,and still thump a little… just barely breaking it in-but I couldn’t be happier with the sound quality. I was genuinely shocked. I fully expected it to thump and hit low, but didn’t realize it was gonna sound this good while doing it. Time will tell how it holds up… but so far this thing is outstanding. I can’t wait to crank it up after a little break in period.

By John on August 10, 2025 Checkmark Icon Verified purchase




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• RMS Power: 400 watts
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