Down4sound PRO-FAB HD3- 2 12 Sub Box | Dual HD 12-Inch KERF Port Subwoofer Enclosure Box

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  • Down4Sound DUAL 12 INCH TRIPLE LAYER HD WITH KERF Port Sub box Enclosure (2 - 12) Down4sound "PRO-FAB"
  • Down4Sound DUAL 12 INCH TRIPLE LAYER HD WITH KERF Port Sub box Enclosure (2 - 12) Down4sound "PRO-FAB"
  • Down4Sound DUAL 12 INCH TRIPLE LAYER HD WITH KERF Port Sub box Enclosure (2 - 12) Down4sound "PRO-FAB"
  • Down4Sound DUAL 12 INCH TRIPLE LAYER HD WITH KERF Port Sub box Enclosure (2 - 12) Down4sound "PRO-FAB"
  • Down4Sound DUAL 12 INCH TRIPLE LAYER HD WITH KERF Port Sub box Enclosure (2 - 12) Down4sound "PRO-FAB"
MSRP: $879.99
— You save $180.00


Experience Extreme Sound with the PRO-FAB HD3 Dual 2 12 Inch KERF Ported Subwoofer HD Birch Enclosure

Are you craving high-performance audio and extreme sound quality? Look no further than Down4sound's PRO-FAB HD3 Dual 12 Inch Ported Subwoofer HD Birch Enclosure. Designed to deliver unmatched power and precision, this enclosure is built to handle the biggest and baddest 12-inch subwoofers with ease.

  • Unleash the Power: With its THICK triple (3-layer) baffle design, the PRO-FAB HD3 is engineered to handle the immense power that comes with large subwoofers. Experience mind-blowing bass and crystal-clear sound like never before.
  • Lightweight and Durable: This enclosure offers the perfect balance between lightweight construction and extra strength. Its innovative design ensures a powerful and dynamic audio experience without compromising on durability.
  • Engineered for Deep Bass: The PRO-FAB HD3 is the ultimate choice for automotive sound enthusiasts who crave deep bass with every beat. Take your in-car audio system to the next level and feel the music reverberate through your entire being.
  • Sleek and Acoustically Superior: Finished with a kerf port for a smooth appearance and incredible acoustic performance, this enclosure is the epitome of style and substance. It has been meticulously engineered to deliver loud and true sound.
  • Built for Audiophiles: If you're a true audiophile, the PRO-FAB HD3 is your dream come true. Immerse yourself in an audio journey like never before, and hear your music in all its glory.
  • Elevate Your Audio Experience: Say goodbye to average sound quality and upgrade to the PRO-FAB HD3 Dual 12 Inch Ported Subwoofer HD Birch Enclosure. Let the music speak for itself and elevate your in-car audio to new heights.
  • Get ready to rock your ride with extreme sound – get the PRO-FAB HD3 today and make every drive a musical adventure!

DUAL (2) 12 HD3 SUB BOX ENCLOSURE technical information:

Outside Dimensions:

  • Width: 37"
  • Height: 17"
  • Depth: 29"

VOL-Net size, after displacements, 4.96 Cubes

Port size.

  • Width: 5 ½"
  • Height: 14"
  • Depth: 23 ½"

Tuning frequency based off actual port: 32Hz

CUTOUT Hole Size: 11.09 inch

Fits Sundown Audio X, Z series subwoofers. triple layer is on baffle,  thick double layer on all the rest



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Warranty Information

Warranty Information

Your new Down4Sound product is covered by 1 limited warranty if purchased from Down4Sound or an authorized Down4Sound dealer. This warranty does not cover improper installation, accidental damage, misuse, abuse, improper wiring, operation of unit outside of listed specifications, or any product that has been modified or repaired by anyone other than Down4Sound. Your warranty covers defects in materials and/or workmanship ONLY and is not an insurance policy. The warranty only covers the original owner of the amplifier.

All warranty returns must be accompanied by the original sales invoice or receipt. You must contact us to request an RMA number prior to sending any returns via the RMA request form on our website. You are responsible for the cost of shipping your product back to us for warranty examination. If your product is covered under warranty, shipping back to you will be at no charge to you – if your product is replaced/repaired outside of warranty you must pay for return shipping and repair bill prior returning of the product or if no defect is found you are required to pay for return shipping only.

At the sole discretion of Down4Sound your product will be either repaired or replaced when it is being covered under warranty. In the event of shipping damage due to improper packaging on products being returned to Down4Sound the customer is liable for the cost of all damages, necessary repairs, or replacement. Be sure to properly pack your return!

*  Extended additional warranty purchased on amplifiers take in affect from the date of purchase and must also be stated on orginal sales invoice or receipt. 



Refund/Return Policy:


Down4Sound - Hours of Operation

Monday 6am - 9pm PDT
Tuesday 6am - 9pm PDT
Wednesday 6am - 9pm PDT
Thursday 6am - 9pm PDT
Friday 6am - 9pm PDT
Saturday 8am - 4pm PDT
Sunday Closed
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7 Reviews

  • 5


    Posted by Jorge Rodríguez on Feb 27, 2024

    When are you guys gonna have more trying to order one with two of your xv3 sundowns subs

  • 5

    Bass hits hard

    Posted by Edvin Martell Hopkins on Dec 24, 2023

    Shipping had damaged corners from it being heavy

  • 4

    Sub Box damaged

    Posted by Joseph Krohn on Nov 04, 2023

    Accidentally bought the wrong size box. Super heavy duty but it came damaged on one corner. Not terrible but noticeable and crushed on the corner.

  • 5


    Posted by Brian on Jul 28, 2023

    Beefy box with strong wood. Its bigger than the picture looks. And it is about 75 pounds empty so plan accordingly. The cutout was slightly too small for my subs so I had to sand 1mm from the cutout. Best box I ever purchased. Note it only has one negative and one positive post so if you have two dual 2 ohm subs you will need to wire them to 2 ohm and strap your amps if it is not .5 ohm stable.

  • 5

    Beast of a box

    Posted by Cole Blakeney on Apr 24, 2023

    Just got one of these for my 2 ZV612’s and honestly after seeing how beefy it’s built and it’s alone weight it’s a beast of a box for the money and free shipping you really can’t beat that.

  • 5

    Good quality and solid

    Posted by Marcello on Apr 12, 2023

    This box makes my x12 v3's sound so good with deeep bass and no flex. I would definitely recommend it.

  • 5

    2 12 subwoofer enclosure

    Posted by Mike Seldomridge on Mar 06, 2023

    Very solid and well built enclosure, worth every penny!

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