Sundown Audio UV18D4 U-8" D4 750W RMS 8" U Series Dual 4-ohm Car Subwoofer 1500W MAX
The Sundown Audio SW-UV18D4 U-8" D4 subwoofer is designed to deliver powerful bass with impressive sound quality. It features dual voice coils and a durable aluminum voice coil for reliable performance. Built to last, it includes a sturdy cast basket and spring-loaded terminals. This subwoofer is perfect for enhancing your car audio experience, whether you prefer ported or sealed enclosures.
Features:
• Power Handling: RMS 750 Watts, MAX 1500 Watts
• Impedance: Dual 4 ohm
• Mount depth: 6.02"
• Sensitivity: 81.6 dB
Specifications:
Power Handling: 750 watts RMS, 1500 watts peak
Impedance: Dual 4-ohm voice coils
Voice Coil: 2.25" high-temperature aluminum
Sensitivity: 81.6 dB
Resonance Frequency (Fs): 41.288 Hz
Xmax: 18 mm
Mounting Depth: 6.02"
Cutout Diameter: 7.3"
Recommended Enclosure: Ported: 0.65 - 0.75 cubic feet, tuned to 35 Hz Sealed: 0.3 cubic feet
| Specification | Details |
|---|---|
| Model | SW‑UV18D4 (U Series 8″ D4) |
| UPC | 810111131162 |
| Power Handling | 750 W RMS / 1500 W Peak |
| Impedance | Dual 4 Ω Voice Coils |
| Sensitivity | 81.6 dB |
| Resonance Frequency (Fs) | 41.29 Hz |
| Xmax | 18 mm |
| Mounting Depth | 6.02″ |
| Cutout Diameter | 7.3″ |
| Voice Coil | 2.25″ High-Temp Aluminum Voice Coil |
| Recommended Sealed Box | ≈ 0.30 ft³ |
| Recommended Ported Box | 0.65–0.75 ft³, tuned to 35 Hz |
| Basket | Cast basket with spring‑loaded terminals |
| Cooling & Vents | Rear-gap vented, aluminum shorting rings for heat relief |
| Surround | Double-stitched |
| Dimensions | Mount depth: 6.02″ / Cutout: 7.3″ / Motor diameter: ~6.14″ |
| Recommended Uses | Ported or sealed enclosures for high-impact mobile audio setups. |
Free shipping is available within the 48 U.S. states. Orders placed before 11 PM ET are typically processed the next business day and arrive within 5–8 business days. Tracking information will be provided as soon as your order ships.
Need to make a change to your order? Contact us within 24 hours of purchase, and we'll be happy to help. Please note that orders already processed for shipment cannot be canceled.
1-Year Limited Warranty: As an authorized dealer, we provide a 1-year limited warranty covering manufacturer defects in materials and workmanship under normal use. The warranty does not cover physical damage, misuse, improper installation, or normal wear and tear.
Customer Support : 9:00 am to 5:00 pm
Address: 13446 Alondra Boulevard, Cerritos ,California 90703, United States
Email: info@eliteautogear.com
For technical support questions, contact us at cs@eliteautogear.com
Phone: (877)-215-8187
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Low End You Can Feel
Bass Built for Daily Driving and Competition
Controlled Low End
Designed for tight, repeatable bass rather than one-note boom, so basslines and kick drums stay separate.
Built to Take Power
Voice coil, spider and cone materials are matched to the rated RMS so the sub handles sustained output.
Match the Enclosure
Performance depends on the box. Sealed for accuracy, ported for output. See the specs for recommended volume and tuning.
Wire It Right
Coil configuration decides your final impedance. Match it to a load your amplifier is stable at before wiring.
