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Sundown Audio

Sundown Audio U-6.5 U-Series 6.5" 400W RMS Car Subwoofer

$269.55
$214.29
$259.99
18% Off
(You save $55.26 )
SKU: U-6.5
UPC: 810111131131
Condition: New
Availability: Usually Ships in 1-2 Days
Shipping: Calculated at Checkout
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Descriptions

About: Sundown Audio U-6.5 U-Series 6.5" 400W RMS Car Subwoofer 

Perfect for high-power underseat enclosures and designed to be at home in the competition lanes or playing your favorite tunes, the U Series is the premier “standard suspension” woofer in the Sundown lineup. A double-stacked 9” wide ferrite magnet system is coupled to a thick top plate. A thick set of shorting rings are also used inside the magnets and on the pole cap, smoothing out frequency response while doubling as a heat sink and airflow guide. An all-new, substantially thicker custom aluminum frame was designed specifically for the U Series, and equipped with heat-dissipation ribs. The v.2 motor also features an extended pole piece to keep the coil controlled under high stress!

Specifications: 

  • 400 Watts RMS/1000 Watts Peak
  • Dual 2 or 4 ohm voice coils
  • Optimized for small ported enclosures
  • Aluminum 1.75” voice coil former for superior heat dissipation
  • High-temperature copper voice coil
  • Double stitched surround
  • Heavy-duty cast basket
  • Spring-loaded terminals accept up to 8-gauge wire
  • Stitched-on heavy-duty tinsel leads
  • Solid pole with vent channels and aluminum shorting ring cap
  • Rear gap-venting
  • Top-Plate Cooling Channels

Enclosure Specifications: 

  • Sealed Enclosure: 0.125-0.2 cu. ft. net
  • Ported Enclosure: 0.25-0.35 cu. ft. net
  • Recommended Tuning: 35Hz -40Hz
  • Recommended Port Area: 4-5 sq. in
  • Displacement: 0.04 cu. ft. 
  • Depth: 5.71"
  • Outside Diameter: 7.17"
  • Cutout: 5.94"
Thiele-Small ParametersU-6.5SW" D2U-6.5SW" D4
Dc Resistance (Re) 4.0586 Ohms 6.6274 Ohms
Resonance Frequency (Fs)  41.9533 Hz 38.6925 Hz
Equivalent Volume (Vas)  2.9053 L 3.7701 L
Electrical Factor (Qes) 0.5238 0.5005
Mechanical Factor (Qms) 8.5834 7.2470
Total Factor (Qts) 0.4937 0.4681
Inductance (Le) 4.0112 mH 5.5892 mH
Bl Factor (BL) 16.7428 20.0082
Mechanical Mass (Mms) 137.2546 g 124.3518 g
Mechanical Compliance (Cms) 104.8528 uM/N 136.0613 uM/N
Sens (dB @ 1w/1m) 77.8706 78.1460

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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.

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