Q-Logic enclosures take the guesswork out of box-building, so you can enjoy great bass without the time-consuming process of constructing your own enclosure. The QLH-1.2512DS hatchback box accommodates two 12" subwoofers in a sturdy medium-density fiberboard housing, upholstered with durable gray carpet. You can use it as a sealed enclosure, or take advantage of the massive slot vent for truly big bass.

Q-Logic's exclusive interchangeable baffles make these boxes extremely versatile. Got a square sub? You can purchase square baffles to accommodate them. There are even blank baffles available for custom shapes.

The baffles' black finish showcases your subs with style. Since basket design and bolt patterns vary with each subwoofer brand, Q-Logic's ingenious QXs seal rings allow you to customize the baffle openings for almost any woofers available. The box comes with nickel-plated spring post speaker terminals, speaker wire, and a screw pack for attaching the baffles.

This box will fit in trunks, hatchback spaces, and the rear area of most SUVs and vans. Please measure the planned installation location to ensure fit.

Product Highlights:

  • Type 2 hatchback style enclosure for two 12" subwoofers
  • 5/8" medium density fiberboard construction with gray carpet covering — additional 3/4" front panel supports woofer
  • nickel-plated spring post terminals
  • optional interchangeable baffles accommodate non-round subwoofers
  • QXs mounting ring
  • internal volume: 2.5 cubic feet (1.25 per sub)
  • dimensions: 34-1/8"W x 14-7/8"H x 16-1/2"D1 x 11-1/2"D2
  • 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.

Hands-on research

What's in the box?

Download owner's manual

  • Dual hatchback-style enclosure for 12" subwoofers
  • Slot port plug
  • 2 QXs rings
  • Two 30" lengths of speaker wire (with attached 0.205" female quick slides on both ends)
  • Sixteen 1" self-tapping screws
  • Installation Instructions

Product Research

Features

Compatibility: This enclosure is designed to accommodate two 12" woofers. It is a Type 2 enclosure with a total internal volume of 2.5 cu. ft., and can be configured as a sealed or ported enclosure.

Materials: The box is constructed of 5/8" MDF (medium-density fiberboard), with a second 1" MDF panel attached to the front panel to provide the mounting baffle for the woofer. MDF resists flexing and has anti-resonant qualities.

Design: The enclosure consists of two 1.25 cu/ft chambers. For strength, Q-Logic uses a full dado groove on the front, back, top, and bottom panels. The side panels are glued, then locked into these grooves. The edges of the front, back, top and bottom use mitered joints, so there's 50% more surface area for the special glue that bonds them. The side panels of the box are recessed 0.5". The trapezoidal shape of the enclosure better utilizes trunk space by allowing you to put the enclosure against the angled back of the back seat. The enclosure is covered with durable gray carpet with tough ABS edge trim.

Interchangeable Baffles: The front baffles can be removed and replaced with optional baffles for woofers with non-round cutouts. Eight Allen-head screws can be removed, enabling you to remove each baffle. A 4mm Allen wrench is required to loosen/tighten the screws.

QXs-Rings: The QXs-Ring is a multi-diameter woofer mounting adapter which also seals the woofer into the enclosure. Each QXs-Ring has a series of rings around the outside to help center the woofer, and hash marks to help align the woofer's mounting holes. If the mounting diameter of the woofer is 11-1/8" or less, the woofer can be installed without trimming. For woofers with a larger mounting diameter, a portion of the QXs-Ring can be trimmed off, allowing for an extra 1/8" in woofer mounting diameter.

Pre-Cut Slot Port Hole: The box comes configured as a dual-compartment ported enclosure with a tuning frequency of 34Hz, with a pre-cut, 2-3/4" x 11-1/2" slot port with a hard plastic port flange between the woofer cutouts. If the driver manufacturer suggests using a sealed enclosure, or that a sealed enclosure is preferred, you can replace the port flange with the supplied slot port plug, using the same 4 screws from the port flange. Note: There are no provisions for port trimming with the slot port.

Spring Posts: This enclosure has two sets of spring posts speaker terminals located on the back of the enclosure. The spring posts will accept bare wire, pin connectors, banana plugs, and dual banana plugs.

Brackets: Brackets (not included) are recommended for more secure mounting.

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 open the box, verify contents, 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.

Q-Logic QLH-1.2512DS Reviews

Average Customer Review:

7 reviews
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Q-Logic QLH-1.2512DS

Written By Jay, Windsor,CT on Friday, June 27, 2008

Crutchfield Customer Review (What's this?)

i have this box with 2 T1 with an MTX TE1501d and this thing slams. u can hear me from 5 blocks away. cant wait to up grade to the mtx 9500. buy this box u wont regret it

Q-Logic QLH-1.2512DS

Written By cesnaz, Randolph, MA on Sunday, June 15, 2008

Crutchfield Customer Review (What's this?)

Nice box, The sound is very good and the ounly thing missing with it is the grill to protect the woofers, other than that great box.

BEST BOX POSSIBLE FOR 12'S

Written By Brian, STEVENSVILLE, MD on Sunday, May 25, 2008

Crutchfield Customer Review (What's this?)

this box is so awesum because it enables you to change it from ported, to
non. it comes with a fasce plate that goes on with 4 screws to change from
loud and boomy, to punchy. i love this box, its really heavy and can tell it is
capable of a punding, it makes my subs sound great. this is the best box
money can buy in my opinion, i love this box and u will too, u will not be
dissapointed. i have two kenwood w3011 12's in mine and they bump off
the chain, great box q logic is the best!!

THIS BOX IS OFF THE CHAIN!!!

Written By francis, SAN DIEGO, CA on Sunday, April 13, 2008

Crutchfield Customer Review (What's this?)

GOT THIS BOX COUPLE DAYS AGO... AND THOSE 12 INCH PIONEER BASS PACKAGE THAT CRUTCHFIELD (TODD) OFFERED ME... AND EVERYTHING IS OFF THE HOOK! BUMPS LIKE CRAZY AND GUESS WHAT??? IT ONLY RUNS IN WITH A FACTORY STEREO... I GOT SOME PIONEER CD DECK TODAY AS WELL (ORDERED IT WITH CRUTCHFIELD OF COURSE), AND I BET THIS IS GONNA SOUND WAY BETTER!! AND HELP FROM CRUTCHFIELD TECH SUPPORT IS ALWAYS GREAT!!! THANX CRUTCHFIELD!!

Good Box

Written By Doug, Dundee, FL on Wednesday, February 07, 2007

Crutchfield Customer Review (What's this?)

I have 2 Alpine 12" Type-R subwoofers in this box and it does the job fine. I recieved them 4 days after I made the order, so I am happy with the speed of the shipping. The only complaint that I have is that it did not come with a port-plug, which it said it was supposed to come with on the website. Crutchfield said that they would have one shipped to me immediately, so it works out okay. All in all, this is a good box especially if this is your first-time set up and you don't know if you like sealed or ported boxes.

Q-Logic QLH-1.2512DS

Written By tony, NORLINA,N.C. on Monday, May 15, 2006

Crutchfield Customer Review (What's this?)

GREAT BUILT BOX FOR THE PRICE.THIS SUB BOX ALSO HELPS YOU IF YOUR NOT SURE IF YOUR CAR OR TRUCK WILL SOUND BETTER WITH SEALED OR PORTED APPLICATION.WITH THIS SUB BOX YOU HAVE THE OPTION TO DO BOTH.GREAT WORK Q-LOGIC KEEP UP THE GOOD WORK.

Totally AMAZING!

Written By WarRH!NO, Clarksburg, PA on Monday, May 30, 2005

I just bought this box last week and I am totally amazed! I have 2 AudioBahn 12" Flame Q Subwoofers that are powered by the AudioBahn A2200HCT amp. I was using 2 single 12" boxes for my subs and decided it looked pretty ghetto so I wanted a visual upgrade. I was on Crutchfield 2 weeks ago and liked the design and specs on this box and ordered it. It was easy to install and wired up in no time. Whenever I fired up my Grand Am and started bumping to some Kenny Chesney it was like I had bought a whole new system!!! If you are ready to make a serious change to your system, shop around no more and buy this box!