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)

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