Name: Sundown Audio U-6.5SW (Open Box, Like New)
Brand: Sundown Audio
SKU: uv165d4_obn
Price: 199.99 USD
Availability: Discontinued
Rating: 5.0000 (3 reviews)

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Product highlights

• RMS Power: 400 watts
• Impedance: Dual 4 ohm
• Mount depth: 5.71"
• Sensitivity: 78.1460 dB

Learn more about the uv165d4_obn

Description

Authorized dealer

Item Condition - Like New (Open Box):

This product works and looks like new. It may have been opened for a visual demo or product video. In some cases there may be signs of an attempt at installation like opened packaging or mounting screw holes used, but there is no real sign of use or wear. Includes all original parts, packaging and accessories (or suitable replacement)

Sundown Audio U-6.5SW D4 6.5" (U65SWD4)

1000W Peak (500W RMS) 6.5" U Series Dual 4-ohm Car Subwoofer (SW-UV16.5D4)
Quantity: 1

Product Details:

6.5" Dual 4 ohm U Series Subwoofer
Power Handling:

Peak: 1000 watts
RMS: 500 watts

Pressed Paper Cone
Double-Stitched Surround
Optimized for small ported enclosures
Heavy-duty cast basket for added durability
Spring-loaded terminals accept up to 8-gauge wire
Stitched-on heavy-duty tinsel leads for easy connection
Solid pole with vent channels and aluminum shorting ring cap
Rear gap-venting and top cooling channels
1.75" High Temperature Copper Voice coil
Aluminum voice coil former for superior heat dissipation
19 mm Xmax
Double Stacked magnet motor structure
Bolt-through motor design to ensure maximum longevity
Resonance Frequency (Fs): 38.6925 Hz
Sensitivity: 78.14 dB
Recommended sealed box volume: 0.125 cubic feet - 0.2 cubic feet
Recommended ported box volume: 0.25 cubic feet - 0.35 cubic feet
Top-mount depth: 5.71"
Cutout diameter: 5.94"
Authorized Internet Dealer
1-year Manufacturer's Warranty

Priced Individually

Subwoofer Wiring Guide

Wiring Guide to Wire 1 Sundown Audio U-6.5SW (Open Box, Like New) Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Sundown Audio U-6.5SW (Open Box, Like New) Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

Wiring Guide to Wire 3 Sundown Audio U-6.5SW (Open Box, Like New) Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Sundown Audio U-6.5SW (Open Box, Like New) Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Specifications & Details

Subwoofer Specifications

Series

U Series

Subwoofer Size

6.5"

RMS Power Handling

400 watts

Voice Coil(s)

Dual

Impedance (Per Voice Coil)

4 ohm

Voice Coil Material

Aluminum

Voice Coil Diameter

1.75"

Sensitivity

78.1460 dB

Xmax (millimeters)

19 mm

Subwoofer Design

Round / Circle

Main Cone Color

Black

Magnet Structure

Double Stacked

Magnet Type

Ferrite

Recommended Enclosure Specifications

Recommended Enclosure Type

Ported / Vented
Sealed

Minimum Sealed Box Volume

0.125 cubic feet

Maximum Sealed Box Volume

0.2 cubic feet

Minimum Ported Box Volume

0.25 cubic feet

Maximum Ported Box Volume

0.35 cubic feet

Top-Mount Depth (Mounting Depth)

5.71"

Cutout Diameter

5.94"

Shallow Mount Installation

T/S Parameters (Electromechanical)

Free-Air Resonance (Fs)

38.6925 Hz

Equivalent Compliance (Vas)

3.7701 liters

Total Speaker Q Value (Qts)

0.4681

Electrical Q Value (Qes)

0.5005

Electrical Resistance of Voice Coil (Re)

6.6274 ohm

Mechanical Q Value (Qms)

7.2470

What is in the box?

WITB: Subwoofers

Subwoofer

Warranty and Return Policy

Parts Warranty Duration

1 year

Labor Warranty Duration

1 year

Warranty Provider

Manufacturer

Customer Ratings & Reviews

Sundown Audio U-6.5SW (Open Box, Like New) thumbnail image

Overall rating distribution

5 star		100%
4 star		0%
3 star		0%
2 star		0%
1 star		0%

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By feature average rating

Durability		5
Value		5
Features		5
Design		5
Usability		5

Customer Photos & Videos

Customer Reviews

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Massive lil 6.5.

The following review is for SW-UV16.5D4, which is a part of the bundle you are viewing.

This thing looks like a beast very big for a 6.5. Can't wait to try it.

By Jason on October 26, 2025 Checkmark Icon

Verified purchase

4 found this helpful

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The following review is for SW-UV16.5D4, which is a part of the bundle you are viewing.

By Luis on January 29, 2026 Checkmark Icon

Verified purchase

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Impressive “little” subwoofers

The following review is for SW-UV16.5D4, which is a part of the bundle you are viewing.

Definitely gets you bass in a small space, that’s for sure. Typical sundown quality so no worries there. Built really well. Can’t wait to get them playing in my nephews truck.

By Greg on August 31, 2025 Checkmark Icon

Verified purchase

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