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Q-Logic QB-212.4

Dual 12" bandpass subwoofer box

Item # 044QB2124

Why choose a Q-Logic enclosure? For their musical performance and their unbeatable construction.

Find what Fits your vehicle

Why choose a Q-Logic enclosure? For their musical performance and their unbeatable construction.

Discontinued item

Item # 044QB2124

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About the Q-Logic QB-212.4

Why choose a Q-Logic enclosure? For their musical performance and their unbeatable construction. Thanks to reliable locking-joint construction and exceptionally strong adhesive, these boxes are virtually indestructible.

Why choose a Q-Logic enclosure? For their musical performance and their unbeatable construction. Thanks to reliable locking-joint construction and exceptionally strong adhesive, these boxes are virtually indestructible.

This Q-Logic QB-212.4 dual 12" bandpass box (Type 4) is made from 5/8" fiberboard for strength, and is impeccably upholstered with durable grey carpet. A redesigned grille gives your enclosure a cool appearance. Screws are included for your subwoofers. The box come with wires for the internal connections (with quick-slides attached), with two sets of spring posts that will accept bare wire, pin connctors, or banana plugs.

The port tubes are pre-installed. In most cases, you will need to cut the port tubes to length to tune your box, and detailed instructions that will help you determine the proper lengths are included. This box will fit in trunks, hatchback spaces, and the rear area of most SUVs and vans.

Key Specifications:
  • for two 12" subwoofers
  • 5/8" medium density fiberboard
  • 0.78 x 2 cubic feet internal volume (ported section), 1.74 X 1 cubic feet internal volume (shared sealed section)
  • box dimensions:
    • width: 33-5/16"
    • height: 15-3/8"
    • bottom depth: 18-5/16"
    • top depth: 13"
  • warranty: 1 year
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What's in the box:

  • Dual bandpass enclosure
  • 2 Hard plastic port tubes
  • 2 Plastic outer port tube flanges (installed)
  • 2 Rubber inner port tube flanges
  • Two 30" lengths of speaker wire (has 0.205" female quick-slides on both ends)
  • 24 Self-tapping screws
  • Installation Instructions/Tuning Chart
MFR #QB-212.4

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More details on the Q-Logic QB-212.4

Pat M.
The Q-Logic QB-212.4 replaces these items:

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Features

Materials: The box is constructed of 5/8" MDF (medium-density fiberboard), which resists flexing and has anti-resonant qualities. The shared sealed chamber is covered by a 12-15/16" x 9" Plexiglas window.

Design: The enclosure consists of two separate 0.78 cu/ft ported chambers, and a 1.74 cu/ft shared sealed chamber. Each ported chamber will accept a 12" woofer and the sealed chamber is shared by both woofers. For strength, Q-Logic uses a full dado groove on the front, back, top, and bottom panels. The side panels and internal woofer mounting 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 1/4". The enclosure is covered with durable dark gray carpet.

Ports: The enclosure has two port openings, one on each side of the Plexiglas window. The plastic outer flange for each port tube comes pre-installed. The Tuning Chart sheet provides guidelines on the proper length to cut the ports. Once the ports are trimmed, they must be inserted into the outer flanges.

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

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