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U-Series v2 6.5
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U-Series 6.5
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U-Series 6.5
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U-Series v2 6.5
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U-Series v2 6.5

U-Series 6.5" v.1 Subwoofer

Regular price $199.99 USD
Regular price Sale price $199.99 USD
Shipping calculated at checkout.

Notice On Packaging For Subwoofers
Sundown Audio has led the industry in quality and performance for over a decade. To improve accuracy and transparency, we have updated our subwoofer power ratings to reflect true real-world performance.
During this transition, some packaging may show previous ratings. Performance fully aligns with our current published specifications. If you have any questions about authenticity or ratings, please contact directly for confirmation.

Impedance: D4
  • 500 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
SpecificationU6.5v2 D2U6.5v2 D4
Fs41.95 Hz38.69 Hz
Re4.05 Ω6.62 Ω
Qms8.58007.2400
Qes0.52000.5000
Qts0.49000.4600
Mms137.25 g124.35 g
Cms104.85 µm/N136.06 µm/N
Sd126.6 cm²126.6 cm²
Vas2.9 L3.77 L
Sensitivity80.0 dB78.1 dB
BL16.740 T·m20.000 T·m
Le4.01 mH5.58 mH
X-Max19 mm19 mm
RMS Power500 W500 W
Peak Power1000 W1000 W
SpecificationU6.5v2 D2/D4
Overall Diameter7.17"
Cutout Diameter5.94"
Motor Diameter5.51"
Mounting Depth5.71"
Displacement0.40 Cu. Ft.
Sealed Volume0.125 cu ft
Ported Volume0.25 cu ft
Port Tuning35 Hz
Port Area4-5 sq in
4th Order Sealed0.09 cu ft
4th Order Ported2.25 cu ft
4th Order Port Area5.5 sq in
4th Order Port Length6"

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