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Pioneer UD-SW250D

Single down-firing sealed enclosure for 10" shallow sub

Item # 130DSW250D

Discontinued item
7 questions - 11 answers

Item # 130DSW250D

About the Pioneer UD-SW250D

When space is limited

Pioneer's compact UD-SW250D subwoofer enclosure will give you great bass in a limited space. At less than 6" tall, it'll fit in the cab of a pickup truck and many other challenging locations. Built with 5/8" MDF and is covered in black carpet, this small sealed enclosure offers an internal volume of 0.35 cubic feet, and its down-firing configuration delivers a deeper sound. 

Product highlights:

  • sealed down-firing enclosure for one 10" shallow subwoofer
  • 5/8" MDF (medium-density fiberboard) with black carpet covering
  • internal volume: 0.35 cubic feet
  • dimensions: 18-3/4"W x 5-7/8"H x 12"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # UD-SW250D

What's in the box:

  • One down firing enclosure for a single shallow mount 10" subwoofer
  • Installation instructions (multiple languages)
  • 2 Mounting brackets
  • Eight 1" Wood screws

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Crutchfield response

<< >>

More details on the Pioneer UD-SW250D

Pat M.

Product Research


Compatibility: This enclosure is designed for a single Pioneer 10" shallow-mount component subwoofer, TS-SW2502S4 (item number 130TSS2502, sold separately).

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-SW2502S4. The UD-SW250D 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

7 questions already asked

will this fit a 2016 Silverado Crew cab without sticking out from under the seat? Also, what other subs will fit in this particular box other than the pioneer?
[ dew  Jul 30, 2020 ]
1 answer
Hi, thank you for your question. Based on the information we have for sub box mounting in a 2016 Silverado 1500 Crew Cab, the Pioneer UD-SW250D, should fit the under seat location without issue. Due to internal volume of this enclosure, and a strict subwoofer mounting depth measurement, the recommended Pioneer TS-SW2502S4, would be your best bet for all around compatibility. Please feel free to chat with us online or by phone at 1-800-324-9695, if you may want to look into other options, or ask additional questions.
[ Jess  Aug 16, 2020 ]  Staff
Will 10inch diamond back subs fit in this box?
[ Mike  Feb 27, 2020 ]
1 answer
It is designed to work with the Pioneer UD-SW250D which has a mounting depth of 3 1/8". The box also has a relatively small internal volume at 0.35 cubic feet. What model subwoofer do you have? Do you know any of the specs?
[ Cosmo  Mar 16, 2020 ]  Staff
Will it fit in my 2019 Chevy Silverado crew cab 1500 underneath the back seat??
[ Ramos  Oct 08, 2019 ]
1 answer
It might stick out past the seat base a little but it should fit
[ REILLY  Oct 08, 2019 ]
Does anyone know if two of these will fit under the rear seat of a 2004 crew cab chevy Silverado?
[ Jesse  Sep 21, 2018 ]
3 answers
They should fit under your backseat well just make sure to buy the shallow subs to go in the shallow box
[ Jayden  Sep 29, 2018 ]
I have a 2008 crew cab Silverado and it fits perfect. I would assume that the 2004 would have the same amount of room under the seat. Only thing is that I have mine on one side of the rear seat because of the hump running down the middle of the back seat.
[ Jacob  Sep 21, 2018 ]
Probably but dont buy it unless your going to use Pioneer subs, the hole is to big for most other subs. I had to return mine
[ Lane  Sep 21, 2018 ]
Will a kicker cwrt10 fit in this box?
[ Ryan  Aug 23, 2017 ]
2 answers
i'm not sure because I am not familiar with that sub. you will need to check the dimensions such as the mounting depth and the mounting diameter. This box met the mounting depth for the kicker comp RT 10 inch woofer, but I mistakenly did not check the mounting diameter. The hole was too big so my subwoofer would not mount correctly and I had to return it to crutchfield.
[ VINCENT  Aug 23, 2017 ]
Nope - it's made specifically for a Pioneer sub. The hole is a different size than a standard 10" sub.
[ Gary  Aug 23, 2017 ]
I'd like to mount my amp inside the enclosure - how much interior space is usable for such a purpose?
[ John  Aug 07, 2015 ]
2 answers
None. The free air inside this enclosure is very limited to begin with and sticking an amp in there would make it even worse. Secondly trying to run wires through the box and getting the holes to seal will be a nightmare inducing task. Also the amp would not be able to cool properly and will over heat quickly..
[ Shayne  Aug 08, 2015 ]
Your not gonna be able to fit the amp inside.
[ Dylan  Aug 08, 2015 ]

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