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Pioneer UD-SW250D

Single down-firing sealed enclosure for 10" shallow sub

Item #: 130DSW250D

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1 Review | 2 questions - 3 answers

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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. Pioneer recommends installing the TS-SW2502S4 10" shallow subwoofer (sold separately) in this enclosure.

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

Why do I need an enclosure?

An enclosure is simply the box that houses your sub; sealed and ported enclosures are the most popular types. A sealed enclosure is usually smaller in size, sacrificing a little volume level to deliver more accurate bass. The ported enclosure features a vent which allows bass waves to escape from behind the mounted sub, augmenting the bass coming off the front of the sub. Ported boxes are louder, bigger, and a little less accurate. Every sub works best in the size and type of enclosure that's recommended by the manufacturer, so make sure you match your sub with the right box.

Pioneer UD-SW250D Reviews

Average Customer Review:

1 Review

Nice box

Written by: Lee3333 from NYC on September 6, 2014

Crutchfield Customer Review (What's this?)

Very nicely constructed box. I used it for an 8 inch standard sub, for which the air space was perfect. I made an adapter out of 1/8 inch plywood, and it sounds great.

Pros: Solid construction.

Cons: Air space a little small for a 10 inch sub. Only fits a very narrow speaker.

Hands-on research

What's in the box?

Download owner's manual

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

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).

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Customer Q&A

Crutchfield asked  
Why did you buy this?

space. [ Lino  Jan 22, 2016 ]

2 questions already asked

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 ]