The Sundown Audio X v.4 8-inch subwoofer is the undisputed KING of standard cut-out 8-inch subs — designed for bassheads who demand maximum performance in compact installs. This fourth-generation X-Series upgrade outperforms every previous version with stronger motor force, cleaner suspension behavior, lower distortion, and massive linear excursion.

Sundown spent extensive development time optimizing the spider and surround using advanced FEA modeling. The result? A suspension system that drastically improves linearity, control, and output — giving the X-8 v.4 unmatched power handling and mechanical capability for its size.

Built on a newly revised custom-tooled 8-inch frame, this subwoofer pushes the absolute limits of what an 8-inch platform can deliver. With ~20mm Xmax one-way and nearly 2.4 inches peak-to-peak mechanical travel, the X-8 v.4 is capable of serious bass that punches far above its size.

Premium distortion-reduction features — including an aluminum magnet ID shorting ring and other proprietary Sundown engineering tricks — ensure clean output even at extreme excursion.

If you want the strongest, cleanest, and most advanced 8-inch subwoofer in the game, the Sundown X-8 v.4 is the one to beat.

Key Features

• 1250 watts RMS / 2500 watts peak

• Available in Dual 2-OHM or Dual 4-OHM voice coils

• Massive triple-stacked magnet motor

• 2.5-inch high-temp voice coil

• Hyper-extended pole design for improved cooling and excursion

• Newly optimized spider & surround using advanced FEA modeling

• Extended linear Xmax: ~20mm one-way

• Nearly 2.4 inches peak-to-peak mechanical travel

• Aluminum magnet ID shorting ring for reduced inductive distortion

• Custom-tooled Sundown 8-inch frame

• Built for extreme excursion and low distortion

Specifications

T/S Parameters (Dual 2-OHM & Dual 4-OHM)

• RE (Ohms): 3.6 (D2) / 6.0 (D4)

• FS: 41.299 Hz (D2) / 44.150 Hz (D4)

• VAS: 4.126 L (D2) / 3.562 L (D4)

• Qes: 0.436 (D2) / 0.497 (D4)

• Qms: 1.941 (D2) / 2.300 (D4)

• Qts: 0.356 (D2) / 0.409 (D4)

• BL: 21.576 NA (D2) / 27.141 NA (D4)

• Mms: 215.153 g (D2) / 220.090 g (D4)

• Sensitivity: 80.1 dB / 79.8 dB

• Xmax: 19mm one-way

Enclosure Recommendations

• Sealed: 0.3–0.4 cu ft

• Ported: 0.75–1.0 cu ft

• Recommended Tuning: 32 Hz

• Recommended Port Area: 12–16 sq in

• Displacement: 0.13 cu ft

• Mounting Depth: 7.56 inches

• Outside Diameter: 8.71 inches

• Cutout: 7.32 inches

Summary

The Sundown Audio X-8 v.4 is a powerhouse 8-inch sub designed for extreme output, monstrous excursion, and ultra-clean low-end performance. Perfect for daily builds, compact enclosures, and bassheads who want big-sub performance from a small footprint. This is the 8-inch that other brands measure themselves against — and very few come close.