Sundown Audio U Series 15" 4 Ohm DVC 1500 Watt RMS Car/Truck Subwoofer U-15-D4

Sundown Audio U Series 15" 4 Ohm DVC 1500 Watt RMS Car/Truck Subwoofer U-15-D4

The Sundown U Series is the premier standard suspension series. It is the most direct replacement for the world famous Z v.3 woofer line which we produced from 2011 to 2016 before launching the new platform Z v.4 series. Due to numerous advancements in Sundown's design process the U Series is able to deliver performance on-par with the Z v.3 series but at a much lower cost.

Sundown Audio started with a double-stacked / 8.66 wide Y35 grade ferrite magnet system coupled to a one-piece, bumped T-Yoke and a 0.6 thick top-plate. Just as with the Z v.3 before it and their other high-end subwoofers they added a very thick (5 mm) aluminum shorting ring inside the magnets to reduce static inductance and level out inductance over stroke. The U series motor also features a 0.6 long pole-extension to keep the coil under control at high levels of excursion.

Highlights:
- Black Aluminum 3 voice coil former for superior heat dissipation.
- High Temperature Round-Wire CCAW voice coil with high-temp black adhesive.
- Double stitched surround.
- Heavy duty cast basket.
- Spring loaded terminals accept up to 8 gauge.
- Stitched-on double-XL tinsel leads.
- Rear vented pole piece.
- Rear drilled gap-venting.
- Innovative high-velocity cast aluminum vented frame spacer ring.
- Magnet ID shorting ring.
- Top-Plate Cooling Channels.
- Cast Aluminum surround bolt-on rings.
- Optimized for small ported or bandpass enclosures.

This listing includes:
(1) Sundown Audio 15 Subwoofer U-15-D4

SPECIFICATIONS PER SUBWOOFER:
Nominal Diameter: 15
Nominal Impedance: 4+4 Ohm
RMS Power Handling: 1500 Watts
Sensitivity (1w/1m): 90.2dB

MOTOR:
Voice Coil Diameter: 3
Voice Coil Former Material: Aluminum
Winding Material: CCAW
Basket Color: Black
Magnet Material: Ferrite
Magnet Size: 8.66

THIELE & SMALL PARAMETERS:
Equivalent Volume: Vas - 63.9L
Free Air Resonance: Fs - 34.9Hz
Mechanical Factor: Qms - 3.48
Electrical Factor: Qes - 0.39
Total Factor: Qts - 0.35
DC Resistance: Re - 6.1 Ohms
Moving Mass: Mms - 353g
Compliance: Cms - 0.06 uM/N
Force Factor: BL - 34.6NA
Voice Coil Inductance: Le - 3.80mH

RECOMMENDED ENCLOSURES:
Sealed Enclosure: 2.0 ft
Ported Enclosure: 3.0 ft
Recommended Tuning: 35Hz
Recommended Port Area: 48 in
Displacement: 0.24 ft

DIMENSIONS PER SUBWOOFER:
Overall Diameter: 15.59 (396mm)
Cutout Diameter: 14.01 (356mm)
Mounting Depth: 9.05 (230mm)
Overall Depth: 10.24 (260mm)
Motor Diameter: 8.66 (220mm)
Unit Weight: 46lbs (20.86kg)

Accepted Payment Methods at Big Jeff Audio

At Big Jeff Audio, we strive to make your shopping experience as smooth as possible by offering a wide variety of payment options. Below is a complete list of the payment methods we accept:

Credit and Debit Cards

• Visa
• Mastercard
• American Express
• Discover
• Diners Club

Digital Wallets

• Amazon Pay
• Apple Pay
• Meta Pay (formerly Facebook Pay)
• Google Pay
• Shop Pay
• PayPal

International Payment Methods

• Bancontact
• iDEAL

Bank Transfers

• Zelle

Financing Options

We also offer financing options to make purchasing easier. Learn more about our financing options here.

• Klarna
• Affirm
• Sezzle
• Snap
• Acima
• Tiptop

If you have any questions or need assistance with payments, feel free to reach out to us at info@bigjeffaudio.com or call us at 737-BIG-JEFF.

Shipping Options and Delivery Time

Do You Offer Expedited Shipping?

Yes! At checkout, you can select from different shipping options:

• Standard Shipping: Free for orders over $100.
• Expedited Shipping: Available at an additional cost, calculated based on the weight and destination of your order.

How Long Does Delivery Take?

• Handling Time: Most orders are processed and shipped within 1 business day after receiving cleared payment. Occasionally, additional handling time may be required, but we’ll notify you if that’s the case.
• Standard Shipping: Typically takes 3-5 business days, though delivery may be affected by extreme weather or holidays.

What Happens If My Package Is Undeliverable?

If your package is refused or marked undeliverable and returned to us by the carrier, you’ll need to pay the full shipping cost to have the package resent. Alternatively, we can refund your order, minus the cost of shipping.

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• If the issue persists, please refer to our detailed guide on tracking your order or contact our customer service team for further assistance.