Sundown Audio
About: Sundown Audio NS-18 v.6 Nightshade NS-Series 18" 3000W RMS Car Subwoofer
The Nightshade 3,000-watt Neodymium sub is engineered to deliver incredibly powerful low end, with an extremely linear excursion and next-level thermal management. It features an eight-layer voice coil for excellent power handling and an extended shorting ring to minimize distortion and deliver a smooth, highly accurate sound at extreme SPL levels.
Specifications:
Enclosure Specifications:
| Thiele-Small Parameters | NS-18 v.6 D1 | NS-18 v.6 D2 |
| Dc Resistance (Re) | 1.8090 Ohms | 3.6629 Ohms |
| Resonance Frequency (Fs) | 28.6283 Hz | 28.3677 Hz |
| Equivalent Volume (Vas) | 78.9335 L | 82.9318 L |
| Electrical Factor (Qes) | 0.4955 | 0.4948 |
| Mechanical Factor (Qms) | 5.2141 | 5.1127 |
| Total Factor (Qts) | 0.4525 | 0.4511 |
| Inductance (Le) |
1.7089 mH | 3.3898 mH |
| Bl Factor (BL) | 21.7903 | 30.4106 |
| Mechanical Mass (Mms) | 722.9906 g |
700.8333 g |
| Mechanical Compliance (Cms) |
42.7481 uM/N | 44.9135 uM/N |
| Sens (dB @ 1w/1m) | 87.4738 | 87.5755 |
| Xmax | 35 mm | 35 mm |

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
With Sezzle and Afterpay