About: Sundown Audio X-18 v.3 X-Series 18" 2000W RMS Subwoofer
Designed with an extended pole piece and an incredible four inches of peak-to-peak excursion, the X v.3 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.3 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.3 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.
Specifications:
Enclosure Specifications:
| Thiele-Small Parameters | X-18 v.3 D1 | X-18 v.3 D2 |
| Dc Resistance (Re) | 1.4 Ohms | 3.2 Ohms |
| Resonance Frequency (Fs) | 26.650 Hz | 28.207 Hz |
| Equivalent Volume (Vas) | 130.302 L | 109.935 L |
| Electrical Factor (Qes) | 0.526 | 0.657 |
| Mechanical Factor (Qms) | 2.793 | 3.091 |
| Total Factor (Qts) | 0.442 | 0.542 |
| Bl Factor (BL) | 14.543 | 20.854 |
| Mechanical Mass (Mms) | 474.114 g | 504.115 g |
| Mechanical Compliance (Cms) |
75.224 uM/N | 63.154 uM/N |
| Sens (dB @ 1w/1m) | 88.6 | 87.6 |
| Xmax | 30mm | 30mm |

Most products include a
limited one year manufacturer’s warranty covering defects in materials and workmanship under normal use.
Warranty coverage does not apply to improper installation, misuse, or damage caused by operation outside
manufacturer specifications.
For complete warranty terms, exclusions, and claim procedures, please visit our full
Warranty Policy page.
Most products include a
limited one year manufacturer’s warranty covering defects in materials and workmanship under normal use.
Warranty coverage does not apply to improper installation, misuse, or damage caused by operation outside
manufacturer specifications.
For complete warranty terms, exclusions, and claim procedures, please visit our full
Warranty Policy page.
Fast shipping across Canada from our Toronto warehouse. Most orders ship within 1–2 business days. Shipping costs and delivery estimates are calculated at checkout. Returns are accepted on eligible items that are unused and in original packaging within our return period. For full details, please view our Shipping Policy and Returns & Exchanges Policy.
Please note that final sale, clearance, open-box, and refurbished items are not eligible for returns or refunds. These items may only be covered under their respective warranty or exchange terms where applicable. For full details regarding open-box items, please review our Open Box Policy.
Sundown Audio
Sundown Audio
Sundown Audio
Sundown Audio
On orders over $200*
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