The Sundown Xv4 18″ Subwoofer delivers unmatched power and control for serious bass enthusiasts. Built with high-grade X v.4 coils, this subwoofer is designed to handle up to 2750W RMS and 5500W peak power, ensuring maximum output without distortion.
Its optimized design enhances air movement and cooling, providing long-lasting performance even under heavy use. The advanced motor structure and large cone area (SD 113.41) create powerful low-frequency response and clean sound reproduction.
Perfect for sealed or ported enclosures, the Xv4 18″ gives you flexibility in setup and tuning — whether for SPL competition or everyday high-quality listening.
Durable, reliable, and beautifully crafted, this subwoofer is the next-level upgrade your sound system deserves.
18″ Xv4 Series Subwoofer
2750W RMS / 5500W Peak Power
Dual 1-Ohm or Dual 2-Ohm Voice Coil Options
Precision-engineered X v.4 Coils for stability
Heavy-duty motor with 9.25″ diameter
Deep bass response with 30 mm Xmax
Sealed or ported enclosure compatibility
Recommended Port Tuning: 32 Hz
Built for extreme durability and clean sound
| Specification | Value |
|---|---|
| RMS Power | 2750 W |
| Peak Power | 5500 W |
| Displacement | 0.28 cu ft |
| Mounting Depth | 15″ |
| Outside Diameter | 18.42″ |
| Cutout Diameter | 16.69″ |
| Motor Diameter | 9.25″ |
| Sealed Enclosure | Not Recommended |
| Ported Enclosure | 7.00 cu ft |
| Recommended Port Tuning | 32 Hz |
| Recommended Port Area | 112 sq in |
| 4th Order Sealed Side | 3.0 cu ft |
| 4th Order Ported Side | 9.0 cu ft |
| 4th Order Port Area | 180 sq in |
| 4th Order Port Length | 8″ |
| Xmax | 30 mm |
| SD (Cone Area) | 113.41 |
| RE (Ohms) | 2.05 / 3.74 |
| FS (Hz) | 25.87 / 25.58 |
| VAS (L) | 93.67 |
| Qes | 0.63 / 0.55 |
| Qms | 4.13 / 4.03 |
| Qts | 0.54 / 0.84 |
| BL (NA) | 19.74 / 26.8 |
| Mms | 737.81 / 656.74 |
| Sensitivity | 86 / 87 dB |
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RMS Power (D2)
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RMS Power (D1)
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Peak Power (D1)
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Peak Power (D2)
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RE D1 (Ohms)
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RE D2 (Ohms)
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FS D1 (Hz)
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FS D2 (Hz)
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VAS D1 (L)
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VAS D2 (L)
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Qes D1
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Qes D2
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Qms D1
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Qms D2
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Qts D1
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Qts D2
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BL D1 (NA)
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BL D2 (NA)
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Mms D1 (Grams)
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Mms D2 (Grams)
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Cms D1 (uM/N)
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Cms D2 (uM/N)
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Sens D1 (dB @ 1w/1m)
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Sens D2 (dB @ 1w/1m)
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Xmax D1
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Xmax D2
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| Subwoofer Measurements | |
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Displacement (Inches)
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Depth (Inches)
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Cutout (Inches)
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Motor Diameter (Inches)
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| Ported Enclosure Specs | |
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Ported Enclosure Size
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Recommended Port Area
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Recommended Port Tuning
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| 4th Order Enclosure Specs | |
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4th Order Sealed Side
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4th Order Ported Side
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4th Order Port Area
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4th Order Port Length
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