The Sundown Audio XV4 18-inch Subwoofer is engineered for extreme bass enthusiasts who demand powerful low-frequency impact with clean, controlled output. Built using Sundown’s high-grade X v.4 coil platform, this massive driver handles 3000W RMS and up to 6000W peak power without distortion, even during long, high-output sessions.

With a huge 113.41 square inch cone area and a rugged 9.25-inch motor structure, the XV4 18-inch moves a tremendous amount of air, delivering deep, authoritative bass that fills your cabin and hits with serious force. Its 30mm Xmax ensures long, linear excursion for exceptional accuracy and low-end extension.

The XV4 18-inch thrives in a 7.00 cubic foot ported enclosure tuned to 32 Hz, but it also works well in advanced bandpass designs for builders targeting maximum SPL and output. Engineered for durability, cooling efficiency, and precise low-frequency reproduction, this subwoofer is a top-tier upgrade for demo builds, competition setups, and high-end bass systems.

Key Features

• 18-inch subwoofer built with advanced X v.4 coils

• 3000W RMS / 6000W Peak power handling

• Available in Dual 1 OHM and Dual 2 OHM versions

• Massive 113.41 square inch cone area for extreme air movement

• Heavy-duty 9.25-inch motor structure

• 30mm Xmax for long, clean excursion

• Recommended ported enclosure: 7.00 cu ft @ 32 Hz

• Compatible with custom sealed, ported, and 4th order designs

• Built for durability, clarity, and SPL-level output

Specifications

Power Ratings

• RMS Power: 3000W

• Peak Power: 6000W

Physical Dimensions

• Displacement: 0.28 cu ft

• Mounting Depth: 15 inches

• Outside Diameter: 18.42 inches

• Cutout Diameter: 16.69 inches

• Motor Diameter: 9.25 inches

Enclosure Recommendations

• Sealed: Not recommended

• Ported: 7.00 cu ft

• Recommended Port Tuning: 32 Hz

• Recommended Port Area: 112 sq in

4th Order Bandpass

• Sealed Side: 3.0 cu ft

• Ported Side: 9.0 cu ft

• Port Area: 180 sq in

• Port Length: 8 inches

Performance Parameters

• Xmax: 30mm

• Sd: 113.41 sq in

• Re: 2.05 OHM (D1) / 3.74 OHM (D2)

• Fs: 25.87Hz (D1) / 25.58Hz (D2)

• Vas: 93.67L

• Qes: 0.63 (D1) / 0.55 (D2)

• Qms: 4.13 (D1) / 4.03 (D2)

• Qts: 0.54 (D1) / 0.84 (D2)

• BL: 19.74 / 26.8

• Mms: 737.81g / 656.74g

• Sensitivity: 86 dB / 87 dB