Sundown Audio


(11 reviews) Write a Review
U12 D4
On Sale
  • Sundown Audio SUNDOWN AUDIO U SERIES 12 1500WRMS D4 OHM
  • Sundown Audio SUNDOWN AUDIO U SERIES 12 1500WRMS D4 OHM
  • Sundown Audio SUNDOWN AUDIO U SERIES 12 1500WRMS D4 OHM
  • Sundown Audio SUNDOWN AUDIO U SERIES 12 1500WRMS D4 OHM
  • Sundown Audio SUNDOWN AUDIO U SERIES 12 1500WRMS D4 OHM
  • Sundown Audio SUNDOWN AUDIO U SERIES 12 1500WRMS D4 OHM
  • Sundown Audio SUNDOWN AUDIO U SERIES 12 1500WRMS D4 OHM
MSRP: $569.99
Now: $309.99
Was: $461.99
— You save $260.00


Sundown Audio U12 D4 Subwoofer:

The Sundown Audio, U series 12-inch Dual 4 Ohm Subwoofer Down4Sounds Top Pick for 12's. The Sundown U12 is a conserve rating of 1500 watts of power; these subwoofers can take the heat; they are also very musical and built like a tank. The Sundown U12 is fully capable of hitting both DEEP and Punchy Bass; The U 12 sub is one investment you thank yourself for buying at Down4Sound! This Sundown audio U 12 is makes almost any kind of music sound amazing!

Sundown audio u12 u15 u18

Sundown U series is rated for 1500w rms for the 12-inch subwoofer available in dual 2 and dual 4-ohm coil configurations.

T/S SPECS: Sundown Audio U12

  • RE (Ohms): 6.1
  • FS (Hz) : 40.0
  • VAS (L): 12.3
  • Qes: 0.38
  • Qms: 2.93
  • Qts: 0.34
  • Le (mH): 3.67
  • BL (NA) 33.7
  • Mms (Grams):284.5
  • Cms (uM/N) : 0.06
  • Sens (dB @ 1w/1m) 85.0db


  • Sealed Enclosure 1.0 cu ft
  • Ported Enclosure 2.0 cu ft
  • Recommended Tuning 35Hz
  • Recommended Port Area 32 sq in
  • Displacement 0.21 cu ft
  • Depth 7.75″
  • Outside Diameter 12.83″
  • Cut-Out 11.01″

Sundown U12 is in Stock and Now, Shipping.

View AllClose

Warranty Information

Warranty Information

Sundown Audio requires us to send customers with equipment problems directly to them for all warranty and non-warranty claims. Please follow their proceedures..

Sundown Audio RMA form:

Sundown Audio Product Warranty Information:


Sundown Audio - Hours of Operation

Monday 9am - 5pm EST
Tuesday 9am - 5pm EST
Wednesday 9am - 5pm EST
Thursday 9am - 5pm EST
Friday 9am - 5pm EST
Saturday Closed
Sunday Closed
View AllClose

11 Reviews

  • 5
    Great subwoofer

    Posted by jeff lawson on May 08, 2023

    This is a great subwoofer The shipping was fast and the packaging was good.

  • 5
    Underrated Powerhouse

    Posted by Ryan Jenning on Dec 04, 2021

    I bought this sub as my first major upgrade to my audio system intending to pair it with an MTX 1501d. I've had it in my vehicle for nearly a year now and this thing is still going strong and now is running on 2500w of sweet b2 amplification. Talk about an underrated sub! I've never smelt any coil burn and have only felt the dust cap get warm a couple of times. I've gotten my money's worth plus a good amount extra out of this one. Highly recommend.

  • 5
    Sundown U12 D4

    Posted by Cole Criniti on Aug 13, 2021

    Amazing sub. Sounds great, and looks even better. The guys at Down4Sound got it shipped quick and helped with any questions I had. Thanks D4S!!!

  • 3

    Posted by John Teague on Jul 18, 2021

    I would give a 5 star review for this, but one of my subs shipped missing the 4 piece stick on gasket. It was the one box that was opened to insert the D4S sticker. How ironic! Lol! I guess a strong gust of wind blew my speaker gasket out of the box and no one noticed! Lol! I contacted D4S several times about replacing the missing speaker gasket, with no response. I will be spending my money elsewhere now. Thanks D4S. You lost a customer.

  • 5
    Absolutely amazing!

    Posted by william higgs on May 29, 2020

    All I can say is wow. I upgraded to U12s from Sa Classics. Wow huge difference in sound and running the same amp and I’m underpowered by at least 1000wrms. If your limited on room and can fit SA make the jump to U series. I’m impressed and amazed. Also the shirt is sweet too thanks JP and D4S! This was my first order and I’m a customer forever now.

  • 5
    New woofers

    Posted by Nick710 on Sep 02, 2019

    Just got 2 12"s in the mail haven't installed them yet probably going to put a crescendo 4k on them if i get that amp but happy so far

  • 5
    Finally replaced my X15

    Posted by Blair on May 09, 2019

    The single X15 was hogging everything the DD M2C could put on it. Two of these on the same wattage have really outshined it. The lowlows aren't quite as pronounced, but everything else really pops and slams. Nice build quality too.

  • 5
    U 12 D4

    Posted by Josh P on Apr 17, 2019

    Very nice sub, hits really hard even with an old school kicker zx1500.1 amp. I think with an updated amplifier it’ll put out more. Shipping to Hi was really quick, overall great experience ordering from d4s. Thanks a bunch

  • 4
    Sundown 12” u series

    Posted by Scott on Oct 14, 2018

    These subs are absolutely beast there good looking too and will take a beating not sure why sundown decided to change up from the usual mounting gaskets to the metal rings and stick on gaskets but they make it a lot more difficult to invert them and also the screws are coming loose with less than a week of play time if it wasnt for that it would be 5 star for sure

  • 5
    sundown audio Useries 12s

    Posted by ricky on Aug 22, 2018

    Sundown audio U series 12s are awesome I am pushing them with an Orion xtr2500 in a 4th order box tuned to 32hz and they hit hard for electrical I only have an xs power battery running my car and my audio system so I know once I finish upgrading the rest of the electrical they’re going to sound louder

View AllClose