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Pioneer UD-SW300D

Single down-firing sealed enclosure for 12" shallow sub

Item # 130DSW300D

Discontinued item
8 questions - 9 answers

Item # 130DSW300D

About the Pioneer UD-SW300D

When space is limited

Pioneer's compact, space-saving UD-SW300D subwoofer enclosure will give you great bass in a limited space. At 6-3/8" inches tall, it'll fit in the cab of a pickup truck and many other challenging locations. Built with 5/8" MDF and covered in black carpet, this small sealed enclosure offers an internal volume of 0.50 cubic feet, and its down-firing configuration delivers powerful, deep bass. 

Product highlights:

  • sealed down-firing enclosure for one 12" shallow subwoofer
  • 5/8" MDF (medium-density fiberboard) with black carpet covering
  • internal volume: 0.50 cubic feet
  • dimensions: 20-5/8"W x 6-1/2"H x 13 7/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # UD-SW300D

What's in the box:

  • One down firing enclosure for a single shallow mount 12" subwoofer
  • Installation instructions (multiple languages)
  • 2 Mounting brackets
  • Eight 1" Wood screws

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Crutchfield response

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More details on the Pioneer UD-SW300D

Pat M.

Product Research


Compatibility: This enclosure is designed for a single Pioneer TS-SW3002S4 12" shallow-mount component subwoofer (no longer available).

Materials: The box is constructed of 5/8" MDF (medium density fiberboard). MDF resists flexing and has anti-resonant qualities.

Design: Complementing the shallow subwoofer, this enclosure provides the smallest sealed box volume recommended for the TS-SW3002S4. The UD-SW300D enclosure will fit under the seat of some vehicles. The exterior is covered with black auto carpet.

Terminals: The spring post wire terminals, located on the side of the enclosure, will accept bare wire (up to 10 gauge), pin connectors, banana plugs, and dual banana plugs. Inside the enclosure, a 15" length of speaker wire is attached to the terminal (bare wire at the other end).

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Customer Q&A

8 questions already asked

Will a 12" Kenwood p-w 1221 sub fit this box?
[ Chris  Aug 09, 2020 ]
1 answer
Looks like it could the only thing that's going to be iffy is the depth of the sub
[ DOKOTA  Aug 09, 2020 ]
Will the jltw3 12 fit in this box?
[ WaveeJay  Nov 06, 2019 ]
1 answer
That sub will fit in that box, Id recommend stuffing approximately 1/3 lb of poly-fill in the box with that sub, as it is a wee bit small, but the poly-fill will help.
[ Calvin  Nov 15, 2019 ]  Staff
Would this fit in a 2018 double cab tacoma?
[ bguanio  Oct 02, 2018 ]
1 answer
We do not have the available mounting space dimensions in your Tacoma. We do provide the dimensions of the enclosure which you can use to cross-reference against the space you find in your desired mounting location: 20-5/8"W x 6-1/2"H x 13 7/8"D
[ Ryan  Oct 08, 2018 ]  Staff
Will the Jensen dubw12 fit in this enclosure?
[ Timothy  Sep 05, 2016 ]
1 answer
I'm afraid not--the max depth that will fit the Pioneer UD-SW300D enclosure is 4-5/16" while the Jensen DUBw12 is 5-3/8" deep. The UD-SW300D enclosure was designed specifically for the Pioneer TS-SW3002S4 12" subwoofer: I hope that helps. My bio:
[ Larry  Sep 12, 2016 ]  Staff
Hello will the Jensen dubw12 subwoofer fit in this enclosure?
[ Timothy  Sep 04, 2016 ]
1 answer
it should, according to the dimensions. Hope this helps.
[ Armando  Sep 09, 2016 ]
What is the exact diameter of the hole cutout and what is the depth from the speaker mounting surface to the inside back surface? Thanks
[ Jared  Jul 28, 2016 ]
1 answer
Thanks for your question. Cutout Diameter or Length (inches)11 3/4 Maximum Speaker Depth (inches)4-5/16 You'll find this information on the product page Details tab under "Features and Specs". Hope that helps.
[ Kenny  Jul 30, 2016 ]  Staff
Will this box fit in a gmc Sierra 1500 crewcab non HD?
[ Brent  Jan 10, 2016 ]
1 answer
Our vehicle specific research doesn't include measurements for subwoofer box mounting. This Pioneer box measures 20-5/8"W x 6-1/2"H x 13 7/8"D though, so your best option would be to measure the area in your truck on your own where you plan on mounting it to see if it would fit. My Bio:
[ Larry  Jan 13, 2016 ]  Staff
I'm using this with the TS-SW300S4 with no polyfill. Has anyone tried it stuffed? If so, any benefits? Since this box is made for the TS-SW300S4, is stuffing the box even necessary?
[ E  Jan 29, 2015 ]
2 answers
I recently added some polyfill to this box to tighten up some of the boom. Polyfill will make a box act like it's larger. So if this enclosure is a bit too small for your particular driver, adding polyfill will help keep it from sounding way too "boomy" and tighten up the bass. rule of thumb is 16 oz of polyfill per cubic foot of volume. I took into account my subwoofer's displacement when surface mounted and put roughly 10oz of polyfill into the box. I may add a bit more since my ear isn't quite pleased yet. hope this helps.
[ Paul  Feb 04, 2015 ]
In my experiences it is always good to put some polyfill or fiberglass in the enclosure. It helps dampen the back waves from the woofer. Everytime I have tried boxes with and without fill I always preferred the sound filled. 1/2 pound of fill would be the most I would put in this box. Try it yourself and see which way you like it. It can be purchased at hobby and craft stores for cheap.
[ Tom  Jan 29, 2015 ]

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