Sundown U-15 V.2

The Sundown Audio U-15 V.2 is a high-performance 15-inch subwoofer designed for car audio systems that require high volume levels, powerful low-frequency bass, and high mechanical durability. The U Series bridges the gap between performance-oriented music subwoofers and SPL-capable woofers, making it suitable for both high-end daily-use systems and particularly powerful bass setups.

For the U-15 V.2, Sundown Audio relies on a solid, double-layered ferrite magnet system combined with a 3-inch high-temperature voice coil. The sophisticated motor cooling system—featuring air channels, gap venting, and cooling channels in the upper pole plate—aids heat dissipation during prolonged heavy use.

A sturdy die-cast aluminum basket forms the mechanical foundation of the subwoofer. The design is engineered for high excursion and is complemented by a robust cone, a double-stitched surround, and exceptionally durable connection wires. With a linear Xmax of 30 mm, the U-15 V.2 offers considerable excursion reserves for high sound pressure levels in the low-bass range.

The U-15 V.2 is available as a D2 version with a dual 2-ohm voice coil and as a D4 version with a dual 4-ohm voice coil. This allows the subwoofer to be flexibly adapted to different mono amplifiers and system configurations.

Technical Specifications

• Manufacturer: Sundown Audio
• Series: U Series V.2
• Subwoofer size: 15" / 38 cm
• Rated power handling: 2,000 watts RMS
• Maximum power handling: 4,000 watts peak
• Voice Coil: Dual Voice Coil
• Available impedances: 2 × 2 ohms (D2) or 2 × 4 ohms (D4)
• Voice coil diameter: 3" / 76.2 mm
• High-Temperature Voice Coil
• Aluminum voice coil assembly for improved heat dissipation
• Xmax: 30 mm
• Effective membrane area Sd: 1,141.9 cm²
• Solid Ferrite Magnet System
• Aluminum shorting rings for reducing inductance
• Extended pole core for improved control during high diaphragm deflection
• Sturdy die-cast aluminum basket
• Double-stitched welt
• Heavy-duty, stitched connection strands
• Spring-loaded speaker terminals for cables up to 8 AWG
• Rear Gap Ventilation
• Cooling channels in the upper pole plate
• Multi-stage cooling system for voice coil and drive
  
  

Thiele-Small Parameters – U-15 V.2 D2

• Voice coils: 2 × 2 ohms
• Re: 3.82 ohms
• Fs: 37.2 Hz
• Qms: 5.40
• Qes: 0.54
• Qts: 0.49
• Capacity: 43.50 liters
• Mms: 438.49 g
• Cms: 0.04 mm/N
• BL: 26.79 Tm
• Le: 3.41 mH
• Sd: 1,141.9 cm²
• Xmax: 30 mm
• Sensitivity (1 W / 1 m): 91.0 dB
  
  

Thiele-Small Parameters – U-15 V.2 D4

• Voice coils: 2 × 4 ohms
• Re: 6.05 ohms
• Fs: 36.4 Hz
• Qms: 5.59
• Qes: 0.61
• Qts: 0.55
• Capacity: 46.10 liters
• Mms: 431.94 g
• Cms: 0.04 mm/N
• BL: 31.14 Tm
• Le: 4.65 mH
• Sd: 1,141.9 cm²
• Xmax: 30 mm
• Sound pressure level (1 W / 1 m): 88.5 dB
  
  

Manufacturer's recommendation for the housing

• Recommended enclosed volume: 2.0 ft³ / approx. 56.6 liters
• Recommended bass reflex volume: 3.0 ft³ / approx. 84.9 liters
• Recommended bass-reflex tuning: 35 Hz
• Recommended port area: 48 in² / approx. 310 cm²
• Subwoofer's internal volume: 0.24 ft³ / approx. 6.8 liters
• Suitable for bass-reflex, sealed, and bandpass applications
• Design Focus on High-Performance Bass-Reflex and Bandpass Systems
  
  

Dimensions

• Outer diameter: 15.6" / approx. 396 mm
• Installation diameter: 14.1" / approx. 358 mm
• Installation depth: 9.0" / approx. 229 mm
• Motor diameter: 9.7" / approx. 246 mm
  
  

The Sundown Audio U-15 V.2 is therefore an interesting choice for high-performance 15-inch subwoofer systems that require a combination of high cone excursion, a robust motor design, and high electrical power handling. Especially when mounted in a well-tuned bass-reflex enclosure, the woofer can showcase its strengths in deep bass and high sound pressure levels
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