Sundown Audio
About: Sundown Audio SA-18 v.2 SA-Series 18" 1000W RMS Car Subwoofer
A top-down improvement from previous models, the SA 18-inch sub features the largest motor in the series, now delivering over 35mm of mechanical excursion. The 2.75” coil punches way above its weight, outperforming most 3” coils without adding mass. The motor also features a large magnet shorting ring (faraday ring) to reduce distortion and deliver smoother response across the entire acoustic spectrum. The motor and coil setup is mated to an extremely robust double-layer spider with fully tied-on & doubled-up “XL” tinsel leads. A competition-grade paper cone and a strong foam surround were used to complete this masterpiece.
Specifications:
Enclosure Specifications:
| Thiele-Small Parameters | SA-18 v.2 D2 | SA-18 v.2 D4 |
|---|---|---|
| Dc Resistance (Re) | 3.97 Ohms | 6.06 Ohms |
| Resonance Frequency (Fs) | 29.051 Hz | 31.868 Hz |
| Equivalent Volume (Vas) | 114.234 L | 106.964 L |
| Electrical Factor (Qes) | 0.424 | 0.458 |
| Mechanical Factor (Qms) | 3.052 | 2.853 |
| Total Factor (Qts) | 0.372 | 0.395 |
| Inductance (Le) | 3.6326 mH | 4.7903 mH |
| Bl Factor (BL) | 32.523 | 38.159 |
| Mechanical Mass (Mms) | 619.174 g | 549.519 g |
| Mechanical Compliance (Cms) | 48.474 uM/N | 45.389 uM/N |
| Sens (dB @ 1w/1m) | 90.1 | 90.7 |
| Xmax | 19mm | 19mm |

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
Sundown Audio
On orders over $200*
Competitive pricing you can trust
Most orders ship within 24 hours
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