SKU: 91628827508

Sundown Audio - U-Series v.1 6.5"

Sale price$135.00 Regular price$150.00
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Ships within 48 hours · Estimated delivery Jul 30 - Aug 4

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Description

Sundown Audio - U-Series v.1 6.5"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 Perfect for high power

  • 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

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

RE (Ohms) 4.0586 6.6274
FS (Hz) 41.9533 38.6925
VAS (L) 2.9053 3.7701
Qes 0.5238 0.5005
Qms 8.5834 7.2470
Qts 0.4937 0.4681
Le (mH) 4.0112 5.5892
BL (NA) 16.7428 20.0082
Mms (Grams) 137.2546 124.3518
Cms (uM/N) 104.8528 136.0613
Sens (dB @ 1w/1m) 77.8706 78.1460
Xmax 19mm 19mm
T/S SPECS U-6.5SW" D2 U-6.5SW" D4
   

Enclosure Specifications

  • Ported Enclosure
    • Size: .25-.35 cu. ft. net
    • Port Area: 4-5 sq. in.
    • Port Tuning: 35hz -40hz
  • Sealed Enclosure
    • Size: 0.125-0.2 cu. ft. net
    • Displacement:  .04 cu. ft. 
  • Depth:  5.71"
  • Outside Diameter: 7.17"
  • Cutout: 5.94"

Physical Dimensions

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 91628827508

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Verified Purchase
Jean Paul
Pawtucket, US
★★★★★ 5
Perfect length and actually stays in place.
Size: 72"W x 75"L (Pack of 1), Color: 1a. Clear
This liner solved a problem I didn’t realize was bothering me until I switched to it. The extra length makes a big difference—no more water sneaking out onto the floor or the curtain riding up while you’re showering. It hangs nicely and gives a cleaner, more finished look compared to standard sizes. The material feels thicker than the cheap liners you usually find, but not overly stiff. It drapes well and doesn’t stick to you while showering, which is a big plus. The magnets at the bottom actually work and help keep it in place against the tub, especially if you have any airflow in the bathroom. Installation was simple and the reinforced holes seem durable enough to last. Overall, it just does what it’s supposed to do without any fuss. For the price, it’s a solid upgrade and something I’d definitely buy again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 19, 2026
M
Verified Purchase
Mike Murdock
Charlottesville, US
★★★★★ 4
Well made
Size: 72"W x 72"L (Pack of 1), Color: 1b. Clear-heavy
The magnets hold well. The grommets are sturdy. The plastic is a bit thick and doesn't like to lie flat against the tub so it is constantly brushing you while you shower.
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Reviewed in the United States on May 14, 2026
A
Verified Purchase
Amazon Customer
Battle Creek, US
★★★★★ 5
Exactly what they say it is.
Size: 72"W x 72"L (Pack of 1), Color: 1b. Clear-heavy
Appears to work exactly as advertised, and quality is very satisfactory, which is always a pleasant surprise on Amazon. Magnets are strong enough, plastic feels pliable and durable. Don't forget the rings aren't included.
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Reviewed in the United States on May 20, 2026
G
Verified Purchase
gbrock
Bozeman, US
★★★★★ 5
Perfect Weight
Size: 72"W x 72"L (Pack of 1), Color: 1a. Clear
Is a perfect liner. It’s not super thick or heavy. Easy to hang.
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Reviewed in the United States on May 26, 2026
A
Verified Purchase
Andrea Santiago
Phoenix, US
★★★★★ 5
Good shower liner
Size: 72"W x 72"L (Pack of 1), Color: 1a. Clear
Actually works! No soap scum or mildew. I have had this shower curtain up since December and all I do is rinse it off. No soap scum. Good item. Good value.
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Reviewed in the United States on May 15, 2026

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